TY  - CONF
AU  - Folić, Boris
AU  - Folić, Radomir
AU  - Liolios, Angelos
AU  - Ćosić, Mladen
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/750
AB  - The paper presents a seismic analysis of the structure-pile-soil system, of a 2D RC frame. The analysis of individual system elements and some potential damage on two Vrancea accelerograms, VR77NS and VRfoc86NS are presented. The impact of the response spectra is provided for VR77NS, because the structure enters the resonant area and the damage increase considerably. Local drift diagrams during the earthquake, and the model damage featured as plastic hinges condition at the end of accelerograms are provided. It is indicated that it is necessary to introduce a dynamic interaction of the structural system, which includes not only the piles, but soil as well, because it became possible at the present level of scientific and technological progress of the human kind.
PB  - Association of civil engineers of Serbia (ACES)
C3  - 8th International Conference Geotechnics in Civil Engineering, Vrnjačka Banja, Serbia
T1  - Some Aspects of the Analysis of Pile Fondations Behaviour Under Seismic Action
EP  - 356
SP  - 343
UR  - https://hdl.handle.net/21.15107/rcub_rims_750
ER  - 

@conference{
author = "Folić, Boris and Folić, Radomir and Liolios, Angelos and Ćosić, Mladen",
year = "2019",
abstract = "The paper presents a seismic analysis of the structure-pile-soil system, of a 2D RC frame. The analysis of individual system elements and some potential damage on two Vrancea accelerograms, VR77NS and VRfoc86NS are presented. The impact of the response spectra is provided for VR77NS, because the structure enters the resonant area and the damage increase considerably. Local drift diagrams during the earthquake, and the model damage featured as plastic hinges condition at the end of accelerograms are provided. It is indicated that it is necessary to introduce a dynamic interaction of the structural system, which includes not only the piles, but soil as well, because it became possible at the present level of scientific and technological progress of the human kind.",
publisher = "Association of civil engineers of Serbia (ACES)",
journal = "8th International Conference Geotechnics in Civil Engineering, Vrnjačka Banja, Serbia",
title = "Some Aspects of the Analysis of Pile Fondations Behaviour Under Seismic Action",
pages = "356-343",
url = "https://hdl.handle.net/21.15107/rcub_rims_750"
}

Folić, B., Folić, R., Liolios, A.,& Ćosić, M.. (2019). Some Aspects of the Analysis of Pile Fondations Behaviour Under Seismic Action. in 8th International Conference Geotechnics in Civil Engineering, Vrnjačka Banja, Serbia
Association of civil engineers of Serbia (ACES)., 343-356.
https://hdl.handle.net/21.15107/rcub_rims_750

Folić B, Folić R, Liolios A, Ćosić M. Some Aspects of the Analysis of Pile Fondations Behaviour Under Seismic Action. in 8th International Conference Geotechnics in Civil Engineering, Vrnjačka Banja, Serbia. 2019;:343-356.
https://hdl.handle.net/21.15107/rcub_rims_750 .

Folić, Boris, Folić, Radomir, Liolios, Angelos, Ćosić, Mladen, "Some Aspects of the Analysis of Pile Fondations Behaviour Under Seismic Action" in 8th International Conference Geotechnics in Civil Engineering, Vrnjačka Banja, Serbia (2019):343-356,
https://hdl.handle.net/21.15107/rcub_rims_750 .

TY  - CONF
AU  - Folić, Boris
AU  - Ćosić, Mladen
AU  - Brčić, Stanko
AU  - Čokić, Miloš
AU  - Sedmak, Simon
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/749
AB  - This paper presents the manner of modeling the aftershock (in an earthquake), the phenomenon whose significance has been noted in the second half of the 20th century. Itlists the constructional systems in which the consideration of the aftershock is important. It shows in more detail the model of the skeletal RC construction, i.e. the 2D RC facade frame constructed on the 60cm-diameter drilled RC piles. The dynamic interaction soil-pile, i.e. the non-linear behaviour of the soil is modelled with the horizontal p-y curves for sand, applying multiplastic link elements. For the accelerogram El Centro during time history (TH) the global and (local) drift, the condition of plastic hinges were considered.
PB  - Association of civil engineers of Serbia (ACES)
C3  - Assessment of the Condition, Maintenance and Rehabilitation of Buildings and Settlements, 10th International Conference, Zlatibor, Serbia
T1  - The effect of aftershock on 2D RC frame founded on piles with P-Y curves
EP  - 386
SP  - 375
UR  - https://hdl.handle.net/21.15107/rcub_rims_749
ER  - 

@conference{
author = "Folić, Boris and Ćosić, Mladen and Brčić, Stanko and Čokić, Miloš and Sedmak, Simon",
year = "2019",
abstract = "This paper presents the manner of modeling the aftershock (in an earthquake), the phenomenon whose significance has been noted in the second half of the 20th century. Itlists the constructional systems in which the consideration of the aftershock is important. It shows in more detail the model of the skeletal RC construction, i.e. the 2D RC facade frame constructed on the 60cm-diameter drilled RC piles. The dynamic interaction soil-pile, i.e. the non-linear behaviour of the soil is modelled with the horizontal p-y curves for sand, applying multiplastic link elements. For the accelerogram El Centro during time history (TH) the global and (local) drift, the condition of plastic hinges were considered.",
publisher = "Association of civil engineers of Serbia (ACES)",
journal = "Assessment of the Condition, Maintenance and Rehabilitation of Buildings and Settlements, 10th International Conference, Zlatibor, Serbia",
title = "The effect of aftershock on 2D RC frame founded on piles with P-Y curves",
pages = "386-375",
url = "https://hdl.handle.net/21.15107/rcub_rims_749"
}

Folić, B., Ćosić, M., Brčić, S., Čokić, M.,& Sedmak, S.. (2019). The effect of aftershock on 2D RC frame founded on piles with P-Y curves. in Assessment of the Condition, Maintenance and Rehabilitation of Buildings and Settlements, 10th International Conference, Zlatibor, Serbia
Association of civil engineers of Serbia (ACES)., 375-386.
https://hdl.handle.net/21.15107/rcub_rims_749

Folić B, Ćosić M, Brčić S, Čokić M, Sedmak S. The effect of aftershock on 2D RC frame founded on piles with P-Y curves. in Assessment of the Condition, Maintenance and Rehabilitation of Buildings and Settlements, 10th International Conference, Zlatibor, Serbia. 2019;:375-386.
https://hdl.handle.net/21.15107/rcub_rims_749 .

Folić, Boris, Ćosić, Mladen, Brčić, Stanko, Čokić, Miloš, Sedmak, Simon, "The effect of aftershock on 2D RC frame founded on piles with P-Y curves" in Assessment of the Condition, Maintenance and Rehabilitation of Buildings and Settlements, 10th International Conference, Zlatibor, Serbia (2019):375-386,
https://hdl.handle.net/21.15107/rcub_rims_749 .

TY  - CONF
AU  - Folić, Radomir
AU  - Ćosić, Mladen
PY  - 2016
UR  - http://rims.institutims.rs/handle/123456789/742
AB  - The paper develops and presents a new multi-disciplinary methodology for the analysis of vulnerability of buildings exposed to accidental actions due to a terrorist attack. The methodology is based on Non-linear Static Pushover Analyses (NSPA) taking into account the principles of Performance-Based Design (PBD). The stiffness matrix for the impact of vertical actions has been used as the initial stiffness matrix in the non-linear analysis which is used to simulate the collapse of individual ground floor columns, forming several possible scenarios. The stiffness matrix by the end of the analysis which simulates the collapse of individual columns is used as initial stiffness matrix in Non-Linear Static Pushover Analysis. The building's vulnerability has been analyzed based on the calculated global and inter-storey drift, newly developed damage coefficient, and multi-criteria optimization. Prompt, reliable and sufficiently accurate answer can be obtained by using newly developed damage coefficient at the level of entire building in the capacitive domain, from elastic through non-linear and up to the collapse state. On the other hand, the damage scenario which requires priority and/or emergency repairs has been identified using the PROMETHEE multi-criteria optimization and considering the predefined alternatives and criteria. When linking different scientific disciplines (non-linear numerical analyses, failure analyses and multi-criteria optimization) qualitative and quantitative decisions can be made about the vulnerability of buildings with several optimized aspects.
PB  - University of Edinburgh and American Concrete Institute, Edinburgh, United Kingdom
C3  - International Conference - Structural Faults and Repair, Edinburgh, UK
T1  - Analysis of Vulnerability of Buildings Damaged as a Result of Terrorist Attack: Scenario of Non-Linear Analyses and Multi-Criteria Optimizations
EP  - 16
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_rims_742
ER  - 

@conference{
author = "Folić, Radomir and Ćosić, Mladen",
year = "2016",
abstract = "The paper develops and presents a new multi-disciplinary methodology for the analysis of vulnerability of buildings exposed to accidental actions due to a terrorist attack. The methodology is based on Non-linear Static Pushover Analyses (NSPA) taking into account the principles of Performance-Based Design (PBD). The stiffness matrix for the impact of vertical actions has been used as the initial stiffness matrix in the non-linear analysis which is used to simulate the collapse of individual ground floor columns, forming several possible scenarios. The stiffness matrix by the end of the analysis which simulates the collapse of individual columns is used as initial stiffness matrix in Non-Linear Static Pushover Analysis. The building's vulnerability has been analyzed based on the calculated global and inter-storey drift, newly developed damage coefficient, and multi-criteria optimization. Prompt, reliable and sufficiently accurate answer can be obtained by using newly developed damage coefficient at the level of entire building in the capacitive domain, from elastic through non-linear and up to the collapse state. On the other hand, the damage scenario which requires priority and/or emergency repairs has been identified using the PROMETHEE multi-criteria optimization and considering the predefined alternatives and criteria. When linking different scientific disciplines (non-linear numerical analyses, failure analyses and multi-criteria optimization) qualitative and quantitative decisions can be made about the vulnerability of buildings with several optimized aspects.",
publisher = "University of Edinburgh and American Concrete Institute, Edinburgh, United Kingdom",
journal = "International Conference - Structural Faults and Repair, Edinburgh, UK",
title = "Analysis of Vulnerability of Buildings Damaged as a Result of Terrorist Attack: Scenario of Non-Linear Analyses and Multi-Criteria Optimizations",
pages = "16-1",
url = "https://hdl.handle.net/21.15107/rcub_rims_742"
}

Folić, R.,& Ćosić, M.. (2016). Analysis of Vulnerability of Buildings Damaged as a Result of Terrorist Attack: Scenario of Non-Linear Analyses and Multi-Criteria Optimizations. in International Conference - Structural Faults and Repair, Edinburgh, UK
University of Edinburgh and American Concrete Institute, Edinburgh, United Kingdom., 1-16.
https://hdl.handle.net/21.15107/rcub_rims_742

Folić R, Ćosić M. Analysis of Vulnerability of Buildings Damaged as a Result of Terrorist Attack: Scenario of Non-Linear Analyses and Multi-Criteria Optimizations. in International Conference - Structural Faults and Repair, Edinburgh, UK. 2016;:1-16.
https://hdl.handle.net/21.15107/rcub_rims_742 .

Folić, Radomir, Ćosić, Mladen, "Analysis of Vulnerability of Buildings Damaged as a Result of Terrorist Attack: Scenario of Non-Linear Analyses and Multi-Criteria Optimizations" in International Conference - Structural Faults and Repair, Edinburgh, UK (2016):1-16,
https://hdl.handle.net/21.15107/rcub_rims_742 .

TY  - CONF
AU  - Ćosić, Mladen
AU  - Brčić, Stanko
AU  - Folić, Radomir
AU  - Šušić, Nenad
PY  - 2016
UR  - http://rims.institutims.rs/handle/123456789/745
AB  - The paper presents the original developed software Quake Nonlin for
performance-based seismic analysis of 3D structural models. Software Nonlin
Quake consists of several independent compatible softwares that implements:
create a database of two componential ground motion records (GMR), generation
and processing of multicomponential GMR, creating incomplete and complete
nonstationary artificial accelerograms, deterministic and probabilistic seismic
hazard analysis, generation and processing of multicomponential response
spectras, analysis of design parameters, processing of pushover curves and
surfaces, calculation based on hybrid incremental nonlinear static-dynamic
analysis, target displacement analysis, analysis and scaling of response spectras
and analysis of target displacement envelope. For four considered methods for
analysis of system performances: nonlinear static pushover analysis (NSPA),
incremental nonlinear dynamic analysis (INDA), incremental dynamic analysis
(IDA) and hybrid incremental nonlinear static-dynamic analysis (HINSDA), flow
charts are shown.
PB  - Savez građevinskih inženjera Srbije SGIS
C3  - 5th International Conference of Earthquake Engineering and Engineering Seismology, Sremski Karlovci, Serbia
T1  - Nonlin Quake: Expert System for Performance-Based Analysis of Structures
EP  - 316
SP  - 303
UR  - https://hdl.handle.net/21.15107/rcub_rims_745
ER  - 

@conference{
author = "Ćosić, Mladen and Brčić, Stanko and Folić, Radomir and Šušić, Nenad",
year = "2016",
abstract = "The paper presents the original developed software Quake Nonlin for
performance-based seismic analysis of 3D structural models. Software Nonlin
Quake consists of several independent compatible softwares that implements:
create a database of two componential ground motion records (GMR), generation
and processing of multicomponential GMR, creating incomplete and complete
nonstationary artificial accelerograms, deterministic and probabilistic seismic
hazard analysis, generation and processing of multicomponential response
spectras, analysis of design parameters, processing of pushover curves and
surfaces, calculation based on hybrid incremental nonlinear static-dynamic
analysis, target displacement analysis, analysis and scaling of response spectras
and analysis of target displacement envelope. For four considered methods for
analysis of system performances: nonlinear static pushover analysis (NSPA),
incremental nonlinear dynamic analysis (INDA), incremental dynamic analysis
(IDA) and hybrid incremental nonlinear static-dynamic analysis (HINSDA), flow
charts are shown.",
publisher = "Savez građevinskih inženjera Srbije SGIS",
journal = "5th International Conference of Earthquake Engineering and Engineering Seismology, Sremski Karlovci, Serbia",
title = "Nonlin Quake: Expert System for Performance-Based Analysis of Structures",
pages = "316-303",
url = "https://hdl.handle.net/21.15107/rcub_rims_745"
}

Ćosić, M., Brčić, S., Folić, R.,& Šušić, N.. (2016). Nonlin Quake: Expert System for Performance-Based Analysis of Structures. in 5th International Conference of Earthquake Engineering and Engineering Seismology, Sremski Karlovci, Serbia
Savez građevinskih inženjera Srbije SGIS., 303-316.
https://hdl.handle.net/21.15107/rcub_rims_745

Ćosić M, Brčić S, Folić R, Šušić N. Nonlin Quake: Expert System for Performance-Based Analysis of Structures. in 5th International Conference of Earthquake Engineering and Engineering Seismology, Sremski Karlovci, Serbia. 2016;:303-316.
https://hdl.handle.net/21.15107/rcub_rims_745 .

Ćosić, Mladen, Brčić, Stanko, Folić, Radomir, Šušić, Nenad, "Nonlin Quake: Expert System for Performance-Based Analysis of Structures" in 5th International Conference of Earthquake Engineering and Engineering Seismology, Sremski Karlovci, Serbia (2016):303-316,
https://hdl.handle.net/21.15107/rcub_rims_745 .

TY  - CONF
AU  - Folić, Radomir
AU  - Ćosić, Mladen
PY  - 2016
UR  - http://rims.institutims.rs/handle/123456789/743
AB  - The authors of the paper, on the basis of the analysis of several thousand scientific papers, presented their original systematization of nonlinear seismic methods for structural performance analysis, which were developed in the last twenty years. Nonlinear seismic methods are generally classified into two groups: Nonlinear Static Analyses (NSA) and Nonlinear Dynamic Analyses (NDA). The analyses of non linear seismic structural response were classified separately from the target displacement analysis which defines the relationship of the seismic demand and the seismic response. On the other hand, the classification was also conducted depending on whether a nonlinear response of the system is obtained by the implementation of incremental-iterative procedures or by the implementation of semi-iterative and/or semi-incremental procedures. Nonlinear Dynamic Analyses were classified according to the concept of mathematical formulation, i.e. whether they are based on only one dynamic analysis, several dynamic analyses or are solved in combination with other methods. By implementing the conducted systematization and classification of nonlinear seismic methods, on can very efficiently consider which type of method is optimal for structural analysis and which type of method should be taken into account in the phase of preliminary and final analyses in the course of scientific research and professional projects.
PB  - University of Structural Engineering & Architecture (VSU) 'Lyuben Karavelov' - Sofia, Bulgaria
C3  - 16th International Scientific Conference VSU, Sofia, Bulgaria
T1  - Performance-based nonlinear seismic methods of structures: A Review of Scientific Knowledge in the Last 20 Years
EP  - 156
SP  - 146
UR  - https://hdl.handle.net/21.15107/rcub_rims_743
ER  - 

@conference{
author = "Folić, Radomir and Ćosić, Mladen",
year = "2016",
abstract = "The authors of the paper, on the basis of the analysis of several thousand scientific papers, presented their original systematization of nonlinear seismic methods for structural performance analysis, which were developed in the last twenty years. Nonlinear seismic methods are generally classified into two groups: Nonlinear Static Analyses (NSA) and Nonlinear Dynamic Analyses (NDA). The analyses of non linear seismic structural response were classified separately from the target displacement analysis which defines the relationship of the seismic demand and the seismic response. On the other hand, the classification was also conducted depending on whether a nonlinear response of the system is obtained by the implementation of incremental-iterative procedures or by the implementation of semi-iterative and/or semi-incremental procedures. Nonlinear Dynamic Analyses were classified according to the concept of mathematical formulation, i.e. whether they are based on only one dynamic analysis, several dynamic analyses or are solved in combination with other methods. By implementing the conducted systematization and classification of nonlinear seismic methods, on can very efficiently consider which type of method is optimal for structural analysis and which type of method should be taken into account in the phase of preliminary and final analyses in the course of scientific research and professional projects.",
publisher = "University of Structural Engineering & Architecture (VSU) 'Lyuben Karavelov' - Sofia, Bulgaria",
journal = "16th International Scientific Conference VSU, Sofia, Bulgaria",
title = "Performance-based nonlinear seismic methods of structures: A Review of Scientific Knowledge in the Last 20 Years",
pages = "156-146",
url = "https://hdl.handle.net/21.15107/rcub_rims_743"
}

Folić, R.,& Ćosić, M.. (2016). Performance-based nonlinear seismic methods of structures: A Review of Scientific Knowledge in the Last 20 Years. in 16th International Scientific Conference VSU, Sofia, Bulgaria
University of Structural Engineering & Architecture (VSU) 'Lyuben Karavelov' - Sofia, Bulgaria., 146-156.
https://hdl.handle.net/21.15107/rcub_rims_743

Folić R, Ćosić M. Performance-based nonlinear seismic methods of structures: A Review of Scientific Knowledge in the Last 20 Years. in 16th International Scientific Conference VSU, Sofia, Bulgaria. 2016;:146-156.
https://hdl.handle.net/21.15107/rcub_rims_743 .

Folić, Radomir, Ćosić, Mladen, "Performance-based nonlinear seismic methods of structures: A Review of Scientific Knowledge in the Last 20 Years" in 16th International Scientific Conference VSU, Sofia, Bulgaria (2016):146-156,
https://hdl.handle.net/21.15107/rcub_rims_743 .

TY  - CONF
AU  - Ćosić, Mladen
AU  - Folić, Radomir
AU  - Šušić, Nenad
PY  - 2016
UR  - http://rims.institutims.rs/handle/123456789/618
AB  - Modern geotechnical engineering is based on a multidisciplinary approach to solving complex
geotechnical problems through engineering-geological soil testing, laboratory analyses of physical
and mechanical soil properties, developing constitutive models of soil behaviour, in-situ testing of
geotechnical structures, experimental-laboratory testing of geotechnical structures and developing
of analytical-numerical models for the analysis of geotechnical structures. In addition to structures
formed only from the soil, geotechnical structures also include geotechnical injections, combination
of soil and reinforced concrete (RC) elements, primary RC structures in the soil, structures from
geotextiles/geogrids/geocells and the like. In the group of geotechnical structures, where the
primary role is played by the RC structure in the soil, a specific place is taken by the issue of
analyzing the capacity and integrity of piles. There are a large number of analytical and numerical
methods developed for the purpose of determining the capacity and integrity of piles, as well as a
large number of in-situ tests of real piles constructed in the ground. Also, a series of alternatives
were developed for solving problems in the everyday engineering practice and scientific research.
Despite of this, there are a number of unresolved issues in determining the capacity and integrity of
piles, especially in case of piles in existing structures. This raises a number of questions, such as:
what method, when and for what type of piles should be used? Answers to these questions can be
found in a variety of publications, but there are a considerable number of questions to be answered in order to enhance the practice and scientific knowledge in terms of analyzing the capacity and integrity of piles, and develop new sophisticated and reliable solutions. This paper provides a summary of pile capacity and integrity tests for quick and reliable assessment and the choice of the type of test in different situations. The paper analyzes the most commonly used tests in practice, as well as tests of new generation which have been increasingly used and may replace some proven reliable tests.
C3  - International Conference on Civil Engineering Design and Construction (Science and Practice), Bulgaria, Proceedings
T1  - Review of scientific insights and a critical analysis of pile capacity and pile integrity tests
EP  - 30
SP  - 19
UR  - https://hdl.handle.net/21.15107/rcub_rims_618
ER  - 

@conference{
author = "Ćosić, Mladen and Folić, Radomir and Šušić, Nenad",
year = "2016",
abstract = "Modern geotechnical engineering is based on a multidisciplinary approach to solving complex
geotechnical problems through engineering-geological soil testing, laboratory analyses of physical
and mechanical soil properties, developing constitutive models of soil behaviour, in-situ testing of
geotechnical structures, experimental-laboratory testing of geotechnical structures and developing
of analytical-numerical models for the analysis of geotechnical structures. In addition to structures
formed only from the soil, geotechnical structures also include geotechnical injections, combination
of soil and reinforced concrete (RC) elements, primary RC structures in the soil, structures from
geotextiles/geogrids/geocells and the like. In the group of geotechnical structures, where the
primary role is played by the RC structure in the soil, a specific place is taken by the issue of
analyzing the capacity and integrity of piles. There are a large number of analytical and numerical
methods developed for the purpose of determining the capacity and integrity of piles, as well as a
large number of in-situ tests of real piles constructed in the ground. Also, a series of alternatives
were developed for solving problems in the everyday engineering practice and scientific research.
Despite of this, there are a number of unresolved issues in determining the capacity and integrity of
piles, especially in case of piles in existing structures. This raises a number of questions, such as:
what method, when and for what type of piles should be used? Answers to these questions can be
found in a variety of publications, but there are a considerable number of questions to be answered in order to enhance the practice and scientific knowledge in terms of analyzing the capacity and integrity of piles, and develop new sophisticated and reliable solutions. This paper provides a summary of pile capacity and integrity tests for quick and reliable assessment and the choice of the type of test in different situations. The paper analyzes the most commonly used tests in practice, as well as tests of new generation which have been increasingly used and may replace some proven reliable tests.",
journal = "International Conference on Civil Engineering Design and Construction (Science and Practice), Bulgaria, Proceedings",
title = "Review of scientific insights and a critical analysis of pile capacity and pile integrity tests",
pages = "30-19",
url = "https://hdl.handle.net/21.15107/rcub_rims_618"
}

Ćosić, M., Folić, R.,& Šušić, N.. (2016). Review of scientific insights and a critical analysis of pile capacity and pile integrity tests. in International Conference on Civil Engineering Design and Construction (Science and Practice), Bulgaria, Proceedings, 19-30.
https://hdl.handle.net/21.15107/rcub_rims_618

Ćosić M, Folić R, Šušić N. Review of scientific insights and a critical analysis of pile capacity and pile integrity tests. in International Conference on Civil Engineering Design and Construction (Science and Practice), Bulgaria, Proceedings. 2016;:19-30.
https://hdl.handle.net/21.15107/rcub_rims_618 .

Ćosić, Mladen, Folić, Radomir, Šušić, Nenad, "Review of scientific insights and a critical analysis of pile capacity and pile integrity tests" in International Conference on Civil Engineering Design and Construction (Science and Practice), Bulgaria, Proceedings (2016):19-30,
https://hdl.handle.net/21.15107/rcub_rims_618 .

TY  - JOUR
AU  - Ćosić, Mladen
AU  - Folić, Radomir
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/759
AB  - The paper deals with a methodology developed and presented for analyzing the damage on structures exposed to accidental and seismic actions. The procedure is based on non-linear numerical analysis, taking into account the principles of Performance-Based Seismic Design (PBSD). The stiffness matrix of the effects of vertical action is used as the initial stiffness matrix in non-linear analysis which simulates the collapse of individual ground-floor columns, forming thereby a number of possible scenarios. By the end of the analysis that simulates the collapse of individual columns, the stiffness matrix is used as the initial stiffness matrix for Non-linear Static Pushover Analysis (NSPA) of bi-directional seismic action (X and Y directions). Target displacement analyses were conducted using the Capacity Spectrum Method (CSM). The structure's conditions/state was assessed based on the calculated global and inter-storey drifts and the damage coefficient developed. The damage level to the building was established using an integrated approach based on global and inter-storey drifts, so that, depending on the level of displacements for which the drifts are identified, a more reliable answer can be obtained. Applying the damage coefficient, a prompt, reliable and accurate indication can be obtained on the damage level to the entire structure in the capacitive domain, from elastic and non-linear to collapse state.
T2  - Gradjevinski materijali i konstrukcije
T1  - Performance Analysis of Damaged Buildings Applying Scenario of Related Non-Linear Analyses and Damage Coefficient
T1  - Analiza performansi oštećenih objekata, primenom scenarija povezanih nelinearnih analiza i koeficijenta oštećenja
EP  - 27
IS  - 3
SP  - 3
VL  - 58
DO  - 10.5937/grmk1503003c
ER  - 

@article{
author = "Ćosić, Mladen and Folić, Radomir",
year = "2015",
abstract = "The paper deals with a methodology developed and presented for analyzing the damage on structures exposed to accidental and seismic actions. The procedure is based on non-linear numerical analysis, taking into account the principles of Performance-Based Seismic Design (PBSD). The stiffness matrix of the effects of vertical action is used as the initial stiffness matrix in non-linear analysis which simulates the collapse of individual ground-floor columns, forming thereby a number of possible scenarios. By the end of the analysis that simulates the collapse of individual columns, the stiffness matrix is used as the initial stiffness matrix for Non-linear Static Pushover Analysis (NSPA) of bi-directional seismic action (X and Y directions). Target displacement analyses were conducted using the Capacity Spectrum Method (CSM). The structure's conditions/state was assessed based on the calculated global and inter-storey drifts and the damage coefficient developed. The damage level to the building was established using an integrated approach based on global and inter-storey drifts, so that, depending on the level of displacements for which the drifts are identified, a more reliable answer can be obtained. Applying the damage coefficient, a prompt, reliable and accurate indication can be obtained on the damage level to the entire structure in the capacitive domain, from elastic and non-linear to collapse state.",
journal = "Gradjevinski materijali i konstrukcije",
title = "Performance Analysis of Damaged Buildings Applying Scenario of Related Non-Linear Analyses and Damage Coefficient, Analiza performansi oštećenih objekata, primenom scenarija povezanih nelinearnih analiza i koeficijenta oštećenja",
pages = "27-3",
number = "3",
volume = "58",
doi = "10.5937/grmk1503003c"
}

Ćosić, M.,& Folić, R.. (2015). Performance Analysis of Damaged Buildings Applying Scenario of Related Non-Linear Analyses and Damage Coefficient. in Gradjevinski materijali i konstrukcije, 58(3), 3-27.
https://doi.org/10.5937/grmk1503003c

Ćosić M, Folić R. Performance Analysis of Damaged Buildings Applying Scenario of Related Non-Linear Analyses and Damage Coefficient. in Gradjevinski materijali i konstrukcije. 2015;58(3):3-27.
doi:10.5937/grmk1503003c .

Ćosić, Mladen, Folić, Radomir, "Performance Analysis of Damaged Buildings Applying Scenario of Related Non-Linear Analyses and Damage Coefficient" in Gradjevinski materijali i konstrukcije, 58, no. 3 (2015):3-27,
https://doi.org/10.5937/grmk1503003c . .

TY  - CONF
AU  - Folić, Radomir
AU  - Ćosić, Mladen
AU  - Folić, Boris
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/740
AB  - This paper presents the aspects of damping modelling in structural analysis through the systematization of damping types and flowcharts, depending on the type of analysis applied: linear and non-linear, static and dynamic. Damping has been systematized based on the way it was introduced into calculations, i.e. over material damping, link element damping and damping directly introduced into the analyses which are conducted in capacitive, time and frequency domains. In the process of creating numerical structural models, the type of damping and the way of its introduction into structural analysis can be very efficiently selected by applying the flow charts developed. By applying the developed flowcharts, alternative approaches to the introduction of damping into structural analysis can also be defined
PB  - Higher School Of Civil Engineering (VSU) 'L.Karavelov'-Sofia, Bugarska
C3  - 15th International Science Conference VSU, Sofia, Bulgaria
T1  - Damping Models for Flow Chart Based Structural Analysis
EP  - 164
IS  - 1
SP  - 155
VL  - 1
UR  - https://hdl.handle.net/21.15107/rcub_rims_740
ER  - 

@conference{
author = "Folić, Radomir and Ćosić, Mladen and Folić, Boris",
year = "2015",
abstract = "This paper presents the aspects of damping modelling in structural analysis through the systematization of damping types and flowcharts, depending on the type of analysis applied: linear and non-linear, static and dynamic. Damping has been systematized based on the way it was introduced into calculations, i.e. over material damping, link element damping and damping directly introduced into the analyses which are conducted in capacitive, time and frequency domains. In the process of creating numerical structural models, the type of damping and the way of its introduction into structural analysis can be very efficiently selected by applying the flow charts developed. By applying the developed flowcharts, alternative approaches to the introduction of damping into structural analysis can also be defined",
publisher = "Higher School Of Civil Engineering (VSU) 'L.Karavelov'-Sofia, Bugarska",
journal = "15th International Science Conference VSU, Sofia, Bulgaria",
title = "Damping Models for Flow Chart Based Structural Analysis",
pages = "164-155",
number = "1",
volume = "1",
url = "https://hdl.handle.net/21.15107/rcub_rims_740"
}

Folić, R., Ćosić, M.,& Folić, B.. (2015). Damping Models for Flow Chart Based Structural Analysis. in 15th International Science Conference VSU, Sofia, Bulgaria
Higher School Of Civil Engineering (VSU) 'L.Karavelov'-Sofia, Bugarska., 1(1), 155-164.
https://hdl.handle.net/21.15107/rcub_rims_740

Folić R, Ćosić M, Folić B. Damping Models for Flow Chart Based Structural Analysis. in 15th International Science Conference VSU, Sofia, Bulgaria. 2015;1(1):155-164.
https://hdl.handle.net/21.15107/rcub_rims_740 .

Folić, Radomir, Ćosić, Mladen, Folić, Boris, "Damping Models for Flow Chart Based Structural Analysis" in 15th International Science Conference VSU, Sofia, Bulgaria, 1, no. 1 (2015):155-164,
https://hdl.handle.net/21.15107/rcub_rims_740 .

TY  - JOUR
AU  - Ćosić, Mladen
AU  - Brčić, Stanko
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/758
AB  - This paper presents the original method of controlled building damage mechanisms based on Nonlinear Static Pushover Analysis (NSPA-DMBD). The optimal building damage mechanism is determined based on the solution of the Capacity Design Method (CDM), and the response of the building is considered in incremental situations. The development of damage mechanism of a system in such incremental situations is being controlled on the strain level, examining the relationship of current and limit strains in concrete and reinforcement steel. The correction of cross-section, in which the strain limit is reached, is being implemented by redesigning, and then the process of the NSPA building analysis is being repeated. Since the procedure of the system damage mechanism analysis according to the NSPA-DMBD method is being iteratively implemented and designing checked after the strain reaches the limit, for this analysis a term Iterative-Interactive Design (IID) has been introduced. By selecting, monitoring and controlling the optimal damage mechanism of the system and by developed NSPA-DMBD method, damage mechanism of the building is being controlled and the level of resistance to an early collapse is being increased.
T2  - Facta Universitatis, Series: Architecture and Civil Engineering
T1  - The Development of Controlled Damage Mechanisms-Based Design Method for Nonlinear Static Pushover Analysis
EP  - 40
IS  - 1
SP  - 25
VL  - 12
DO  - 10.2298/fuace1401025c
ER  - 

@article{
author = "Ćosić, Mladen and Brčić, Stanko",
year = "2014",
abstract = "This paper presents the original method of controlled building damage mechanisms based on Nonlinear Static Pushover Analysis (NSPA-DMBD). The optimal building damage mechanism is determined based on the solution of the Capacity Design Method (CDM), and the response of the building is considered in incremental situations. The development of damage mechanism of a system in such incremental situations is being controlled on the strain level, examining the relationship of current and limit strains in concrete and reinforcement steel. The correction of cross-section, in which the strain limit is reached, is being implemented by redesigning, and then the process of the NSPA building analysis is being repeated. Since the procedure of the system damage mechanism analysis according to the NSPA-DMBD method is being iteratively implemented and designing checked after the strain reaches the limit, for this analysis a term Iterative-Interactive Design (IID) has been introduced. By selecting, monitoring and controlling the optimal damage mechanism of the system and by developed NSPA-DMBD method, damage mechanism of the building is being controlled and the level of resistance to an early collapse is being increased.",
journal = "Facta Universitatis, Series: Architecture and Civil Engineering",
title = "The Development of Controlled Damage Mechanisms-Based Design Method for Nonlinear Static Pushover Analysis",
pages = "40-25",
number = "1",
volume = "12",
doi = "10.2298/fuace1401025c"
}

Ćosić, M.,& Brčić, S.. (2014). The Development of Controlled Damage Mechanisms-Based Design Method for Nonlinear Static Pushover Analysis. in Facta Universitatis, Series: Architecture and Civil Engineering, 12(1), 25-40.
https://doi.org/10.2298/fuace1401025c

Ćosić M, Brčić S. The Development of Controlled Damage Mechanisms-Based Design Method for Nonlinear Static Pushover Analysis. in Facta Universitatis, Series: Architecture and Civil Engineering. 2014;12(1):25-40.
doi:10.2298/fuace1401025c .

Ćosić, Mladen, Brčić, Stanko, "The Development of Controlled Damage Mechanisms-Based Design Method for Nonlinear Static Pushover Analysis" in Facta Universitatis, Series: Architecture and Civil Engineering, 12, no. 1 (2014):25-40,
https://doi.org/10.2298/fuace1401025c . .

TY  - CONF
AU  - Folić, Radomir
AU  - Ćosić, Mladen
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/739
AB  - The research presented in the paper employed the general approach in the analysis of robustness of reinforced concrete skeletal (frame) structures in the events of severe damage caused by strong earthquakes. Such damage requires adequate rehabilitation measures. Similar problems are related to incident situations, such as the structures which were bombed in Serbia in 1999, fire effects or sudden collapse of one or several structural elements. In comparison to the classical approach, where the data on the condition of the building are obtained using non-destructive methods, by taking samples, by empirical assessment or by modelling using the linear analyses, taking into account the ultimate limit state and service life calculation according to the regulations (Codes), the procedure presented in this research enables to make a decision on the structure condition by the simulation through the scenario of mutually related analyses. The developed procedure is based on the non-linear numerical analyses, observing the principles of performance based seismic design (PBSD). The example of a 10 storey building was used to present the developed procedure which determines adaptability of the system in an incident situation, which is, in addition, exposed to the earthquake action. The building is designed according to EN 1992 and EN 1998, observing the capacity design method calculation (CDM). The stiffness matrix for the vertical action effects is used as the initial stiffness matrix for the non-linear analysis, which simulates the collapse of individual columns at the base floor, forming a couple of possible scenarios. The stiffness matrix at the end of the non-linear analysis, which simulates the collapse of individual columns, is used as the initial stiffness matrix for the non-linear static pushover analysis for bidirectional seismic action (X and Y directions). The target displacement analysis was conducted according to the capacity spectrum method, considering the response spectrum generated according to ATC 40 regulations. The assessment of the building condition and vulnerability analysis was conducted based on the calculated global and inter-storey drifts. Regarding that according to PBSD methodology, performances of the system are considered applying non-linear numerical models, bringing it to the near-collapse, i.e. collapse state, the implementation of the procedure developed in this manner, enables making reliable decisions about the building condition. This is very useful for defining the rehabilitation, strengthening strategies, or for potential partial change of statical system of the building.
PB  - Varna Free University “Chernorizets Hrabar”, Varna, Bulgaria
C3  - 13th International Scientific Conference, Varna, Bulgaria
T1  - Vulnerability of Damaged Structures: The Concept of the Scenario of Related Non-Linear Analyses
EP  - 10
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_rims_739
ER  - 

@conference{
author = "Folić, Radomir and Ćosić, Mladen",
year = "2014",
abstract = "The research presented in the paper employed the general approach in the analysis of robustness of reinforced concrete skeletal (frame) structures in the events of severe damage caused by strong earthquakes. Such damage requires adequate rehabilitation measures. Similar problems are related to incident situations, such as the structures which were bombed in Serbia in 1999, fire effects or sudden collapse of one or several structural elements. In comparison to the classical approach, where the data on the condition of the building are obtained using non-destructive methods, by taking samples, by empirical assessment or by modelling using the linear analyses, taking into account the ultimate limit state and service life calculation according to the regulations (Codes), the procedure presented in this research enables to make a decision on the structure condition by the simulation through the scenario of mutually related analyses. The developed procedure is based on the non-linear numerical analyses, observing the principles of performance based seismic design (PBSD). The example of a 10 storey building was used to present the developed procedure which determines adaptability of the system in an incident situation, which is, in addition, exposed to the earthquake action. The building is designed according to EN 1992 and EN 1998, observing the capacity design method calculation (CDM). The stiffness matrix for the vertical action effects is used as the initial stiffness matrix for the non-linear analysis, which simulates the collapse of individual columns at the base floor, forming a couple of possible scenarios. The stiffness matrix at the end of the non-linear analysis, which simulates the collapse of individual columns, is used as the initial stiffness matrix for the non-linear static pushover analysis for bidirectional seismic action (X and Y directions). The target displacement analysis was conducted according to the capacity spectrum method, considering the response spectrum generated according to ATC 40 regulations. The assessment of the building condition and vulnerability analysis was conducted based on the calculated global and inter-storey drifts. Regarding that according to PBSD methodology, performances of the system are considered applying non-linear numerical models, bringing it to the near-collapse, i.e. collapse state, the implementation of the procedure developed in this manner, enables making reliable decisions about the building condition. This is very useful for defining the rehabilitation, strengthening strategies, or for potential partial change of statical system of the building.",
publisher = "Varna Free University “Chernorizets Hrabar”, Varna, Bulgaria",
journal = "13th International Scientific Conference, Varna, Bulgaria",
title = "Vulnerability of Damaged Structures: The Concept of the Scenario of Related Non-Linear Analyses",
pages = "10-1",
url = "https://hdl.handle.net/21.15107/rcub_rims_739"
}

Folić, R.,& Ćosić, M.. (2014). Vulnerability of Damaged Structures: The Concept of the Scenario of Related Non-Linear Analyses. in 13th International Scientific Conference, Varna, Bulgaria
Varna Free University “Chernorizets Hrabar”, Varna, Bulgaria., 1-10.
https://hdl.handle.net/21.15107/rcub_rims_739

Folić R, Ćosić M. Vulnerability of Damaged Structures: The Concept of the Scenario of Related Non-Linear Analyses. in 13th International Scientific Conference, Varna, Bulgaria. 2014;:1-10.
https://hdl.handle.net/21.15107/rcub_rims_739 .

Folić, Radomir, Ćosić, Mladen, "Vulnerability of Damaged Structures: The Concept of the Scenario of Related Non-Linear Analyses" in 13th International Scientific Conference, Varna, Bulgaria (2014):1-10,
https://hdl.handle.net/21.15107/rcub_rims_739 .

TY  - JOUR
AU  - Ćosić, Mladen
AU  - Brčić, Stanko
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/757
AB  - This paper presents a typology of pushover curves and the originally developed pushover surfaces based on the generalization of the nonlinear response of the 3D system to the earthquake action. By determination and analysis of the NSPA (Nonlinear Static Pushover Analysis) pushover surface, it is possible to obtain a more complex and a more complete insight of the response and performance of 3D models of structures exposed to the bidirectional seismic action. The setting which served as a base for the development of the mathematical formulation and generation of the NSPA pushover surface presents the application of NSPA pushover curve for the response of the system in one direction. By integrating the system responses for a number of directions, i.e. attac angles of directions of earthquake action, the presentation of the 3D response of the system in the capacity domain is achieved. The typology of NSPA pushover curves is derived as a function of the existence of linear, nonlinear and collapse subdomain, and also considerations are made taking into account the nonlinear stiffness and ductility class of the system. The typology of NSPA pushover surface is derived based on the generalized model of the system response through ductility, ductility in hardening/softening zone and a coefficient of the relationship of stiffness in the nonlinear and linear domain, based on which it is possible to create systems of different stiffness, strength and ductility. The research presented in this paper defines the typological models of NSPA pushover surfaces based on which further discussion can be done on real pushover surfaces of 3D models of structures with a more complex, particularly non-symetric geometry, as well as variation of responses of the system due to bidirectional seismic actions.
T2  - Gradjevinski materijali i konstrukcije
T1  - Typology of NSPA Pushover Curves and Surfaces for 3D Performance-Based Seismic Response of Structures
T1  - Tipologija NSPA pushover krivih i površi za 3D seizmički odgovor konstrukcija prema performansama
EP  - 38
IS  - 4
SP  - 19
VL  - 56
DO  - 10.5937/grmk1304019c
ER  - 

@article{
author = "Ćosić, Mladen and Brčić, Stanko",
year = "2013",
abstract = "This paper presents a typology of pushover curves and the originally developed pushover surfaces based on the generalization of the nonlinear response of the 3D system to the earthquake action. By determination and analysis of the NSPA (Nonlinear Static Pushover Analysis) pushover surface, it is possible to obtain a more complex and a more complete insight of the response and performance of 3D models of structures exposed to the bidirectional seismic action. The setting which served as a base for the development of the mathematical formulation and generation of the NSPA pushover surface presents the application of NSPA pushover curve for the response of the system in one direction. By integrating the system responses for a number of directions, i.e. attac angles of directions of earthquake action, the presentation of the 3D response of the system in the capacity domain is achieved. The typology of NSPA pushover curves is derived as a function of the existence of linear, nonlinear and collapse subdomain, and also considerations are made taking into account the nonlinear stiffness and ductility class of the system. The typology of NSPA pushover surface is derived based on the generalized model of the system response through ductility, ductility in hardening/softening zone and a coefficient of the relationship of stiffness in the nonlinear and linear domain, based on which it is possible to create systems of different stiffness, strength and ductility. The research presented in this paper defines the typological models of NSPA pushover surfaces based on which further discussion can be done on real pushover surfaces of 3D models of structures with a more complex, particularly non-symetric geometry, as well as variation of responses of the system due to bidirectional seismic actions.",
journal = "Gradjevinski materijali i konstrukcije",
title = "Typology of NSPA Pushover Curves and Surfaces for 3D Performance-Based Seismic Response of Structures, Tipologija NSPA pushover krivih i površi za 3D seizmički odgovor konstrukcija prema performansama",
pages = "38-19",
number = "4",
volume = "56",
doi = "10.5937/grmk1304019c"
}

Ćosić, M.,& Brčić, S.. (2013). Typology of NSPA Pushover Curves and Surfaces for 3D Performance-Based Seismic Response of Structures. in Gradjevinski materijali i konstrukcije, 56(4), 19-38.
https://doi.org/10.5937/grmk1304019c

Ćosić M, Brčić S. Typology of NSPA Pushover Curves and Surfaces for 3D Performance-Based Seismic Response of Structures. in Gradjevinski materijali i konstrukcije. 2013;56(4):19-38.
doi:10.5937/grmk1304019c .

Ćosić, Mladen, Brčić, Stanko, "Typology of NSPA Pushover Curves and Surfaces for 3D Performance-Based Seismic Response of Structures" in Gradjevinski materijali i konstrukcije, 56, no. 4 (2013):19-38,
https://doi.org/10.5937/grmk1304019c . .

TY  - CONF
AU  - Ćosić, Mladen
AU  - Folić, Boris
AU  - Folić, Radomir
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/736
AB  - In the paper is developed a discrete numerical solid pile model with a discontinuity and defects. Model included performance-based seismic evaluation of the soil-pile-bridge pier interaction. The pile discontinuity and defects are modelled by reducing the specific finite elements and elastic modulus of concrete. The wave-propagation response of the pile was analyzed based on a step-by-step numerical integration using the Hilber-Hughes-Taylor (HHT) method in time domain (THA). The response analysis is performed with an integration of individual reflectograms into a reflectogram surface, which is generated in a 3D cylindrical coordinate system. Non-linear response of the system is considered using the incremental-iterative Newton-Raphson`s method, while the stability analysis is performed according to the modified geometrical nonlinearity analysis of stability. Determination of critical load and effective length of the pile are performed based on numerical solution and using regression analysis of the power function. The procedure of the soil-pile-bridge pier performance evaluation is based on the incremental nonlinear dynamic analysis (INDA). The system's input signal is treated through the generated artificial accelerograms, which were subsequently processed by soil layers and for the bedrock. Fragility curves were constructed based on solutions of the regression analysis and the probability theory of log-normal distribution, while the generation of reliability curves is based on a solution of vulnerability.
PB  - Higher School of Civil Engineering (VSU) 'Lyuben Karavelov' - Sofia, Bugarska
C3  - 13th International Scientific Conference VSU, Sofia, Bulgaria
T1  - Developing a methodology for the integrated numerical evaluation and performance assessment of soil-pile-pier
EP  - II-244
SP  - II-236
UR  - https://hdl.handle.net/21.15107/rcub_rims_736
ER  - 

@conference{
author = "Ćosić, Mladen and Folić, Boris and Folić, Radomir",
year = "2013",
abstract = "In the paper is developed a discrete numerical solid pile model with a discontinuity and defects. Model included performance-based seismic evaluation of the soil-pile-bridge pier interaction. The pile discontinuity and defects are modelled by reducing the specific finite elements and elastic modulus of concrete. The wave-propagation response of the pile was analyzed based on a step-by-step numerical integration using the Hilber-Hughes-Taylor (HHT) method in time domain (THA). The response analysis is performed with an integration of individual reflectograms into a reflectogram surface, which is generated in a 3D cylindrical coordinate system. Non-linear response of the system is considered using the incremental-iterative Newton-Raphson`s method, while the stability analysis is performed according to the modified geometrical nonlinearity analysis of stability. Determination of critical load and effective length of the pile are performed based on numerical solution and using regression analysis of the power function. The procedure of the soil-pile-bridge pier performance evaluation is based on the incremental nonlinear dynamic analysis (INDA). The system's input signal is treated through the generated artificial accelerograms, which were subsequently processed by soil layers and for the bedrock. Fragility curves were constructed based on solutions of the regression analysis and the probability theory of log-normal distribution, while the generation of reliability curves is based on a solution of vulnerability.",
publisher = "Higher School of Civil Engineering (VSU) 'Lyuben Karavelov' - Sofia, Bugarska",
journal = "13th International Scientific Conference VSU, Sofia, Bulgaria",
title = "Developing a methodology for the integrated numerical evaluation and performance assessment of soil-pile-pier",
pages = "II-244-II-236",
url = "https://hdl.handle.net/21.15107/rcub_rims_736"
}

Ćosić, M., Folić, B.,& Folić, R.. (2013). Developing a methodology for the integrated numerical evaluation and performance assessment of soil-pile-pier. in 13th International Scientific Conference VSU, Sofia, Bulgaria
Higher School of Civil Engineering (VSU) 'Lyuben Karavelov' - Sofia, Bugarska., II-236-II-244.
https://hdl.handle.net/21.15107/rcub_rims_736

Ćosić M, Folić B, Folić R. Developing a methodology for the integrated numerical evaluation and performance assessment of soil-pile-pier. in 13th International Scientific Conference VSU, Sofia, Bulgaria. 2013;:II-236-II-244.
https://hdl.handle.net/21.15107/rcub_rims_736 .

Ćosić, Mladen, Folić, Boris, Folić, Radomir, "Developing a methodology for the integrated numerical evaluation and performance assessment of soil-pile-pier" in 13th International Scientific Conference VSU, Sofia, Bulgaria (2013):II-236-II-244,
https://hdl.handle.net/21.15107/rcub_rims_736 .