Sedmak, Simon

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  • Sedmak, Simon (12)
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Author's Bibliography

The Influence of Parameters of Sand Soil on States PH 2D Frame on Seismic Response

Folić, Boris; Čokić, Miloš; Ćosić, Mladen; Sedmak, Simon; Žugić, Željko

(University of Belgrade - Faculty of Mechanical Engineering, 2023)

TY  - CONF
AU  - Folić, Boris
AU  - Čokić, Miloš
AU  - Ćosić, Mladen
AU  - Sedmak, Simon
AU  - Žugić, Željko
PY  - 2023
UR  - http://rims.institutims.rs/handle/123456789/617
AB  - During earthquakes that exceed the designed level of the structure, the structure gets damaged. Here, the structure-foundation-soil is considered as a system, and the effect of the soil on the piles can be replaced by nonlinear p-y curves. Work on this topic began as early as 1957, based on the analogy between the triaxial test and the form of soil failure, and during the 1970’s, a number of researchers made significant progress in the development of appropriate models for different types of soil. Eurocode 8 pays special attention to the selection of earthquakes as a set of accelerograms. For areas within a radius of several hundred kilometers from central Romania and its southern part, the Vrancea hypocenter has a significant influence. In North Serbia and its surroundings, other sources of earthquakes are also possible, but when choosing accelerogram, the response spectra of several Vrancea records should also be used. The SSI model itself, where the soil is replaced by p-y curves, even though it might look complicated, it is significantly simpler and leads to faster results than integral 3D models. By using adequate soil parameters, fairly reliable data can be obtained on the degree and distribution of damage to the SSI system, like plastic hinges. In soil models used for clean sand, the curves used seem significantly more reliable than clayey ones, but here too caution is needed because the degree of compaction (relative density) has a significant effect, and the way of determining it is still not reliable.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies, Zlatibor, Serbia-Proceedings
T1  - The Influence of Parameters of Sand Soil on States PH 2D Frame on Seismic Response
SP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_rims_617
ER  - 
@conference{
author = "Folić, Boris and Čokić, Miloš and Ćosić, Mladen and Sedmak, Simon and Žugić, Željko",
year = "2023",
abstract = "During earthquakes that exceed the designed level of the structure, the structure gets damaged. Here, the structure-foundation-soil is considered as a system, and the effect of the soil on the piles can be replaced by nonlinear p-y curves. Work on this topic began as early as 1957, based on the analogy between the triaxial test and the form of soil failure, and during the 1970’s, a number of researchers made significant progress in the development of appropriate models for different types of soil. Eurocode 8 pays special attention to the selection of earthquakes as a set of accelerograms. For areas within a radius of several hundred kilometers from central Romania and its southern part, the Vrancea hypocenter has a significant influence. In North Serbia and its surroundings, other sources of earthquakes are also possible, but when choosing accelerogram, the response spectra of several Vrancea records should also be used. The SSI model itself, where the soil is replaced by p-y curves, even though it might look complicated, it is significantly simpler and leads to faster results than integral 3D models. By using adequate soil parameters, fairly reliable data can be obtained on the degree and distribution of damage to the SSI system, like plastic hinges. In soil models used for clean sand, the curves used seem significantly more reliable than clayey ones, but here too caution is needed because the degree of compaction (relative density) has a significant effect, and the way of determining it is still not reliable.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies, Zlatibor, Serbia-Proceedings",
title = "The Influence of Parameters of Sand Soil on States PH 2D Frame on Seismic Response",
pages = "9",
url = "https://hdl.handle.net/21.15107/rcub_rims_617"
}
Folić, B., Čokić, M., Ćosić, M., Sedmak, S.,& Žugić, Ž.. (2023). The Influence of Parameters of Sand Soil on States PH 2D Frame on Seismic Response. in International Conference of Experimental and Numerical Investigations and New Technologies, Zlatibor, Serbia-Proceedings
University of Belgrade - Faculty of Mechanical Engineering., 9.
https://hdl.handle.net/21.15107/rcub_rims_617
Folić B, Čokić M, Ćosić M, Sedmak S, Žugić Ž. The Influence of Parameters of Sand Soil on States PH 2D Frame on Seismic Response. in International Conference of Experimental and Numerical Investigations and New Technologies, Zlatibor, Serbia-Proceedings. 2023;:9.
https://hdl.handle.net/21.15107/rcub_rims_617 .
Folić, Boris, Čokić, Miloš, Ćosić, Mladen, Sedmak, Simon, Žugić, Željko, "The Influence of Parameters of Sand Soil on States PH 2D Frame on Seismic Response" in International Conference of Experimental and Numerical Investigations and New Technologies, Zlatibor, Serbia-Proceedings (2023):9,
https://hdl.handle.net/21.15107/rcub_rims_617 .

Damage occurrence in welded structures of the bucket-wheel boom

Arsić, Miodrag; Flajs, Željko; Sedmak, Aleksandar; Veg, Emil; Sedmak, Simon

(Trans Tech Publications Ltd, Switzerland, 2022)

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Flajs, Željko
AU  - Sedmak, Aleksandar
AU  - Veg, Emil
AU  - Sedmak, Simon
PY  - 2022
UR  - http://rims.institutims.rs/handle/123456789/665
AB  - Causes of damage occurrence in vital components of welded structures of the bucket-wheel
excavator boom (DU1) at the coal landfill of the thermal power plant 'Nikola Tesla A' in Obrenovac
(Serbia) are investigated. Bucket-wheel excavator was produced by French company 'Ameco' and it
moves along the circular track. Taking into account lack of technical documentation, all tests and
were carried out under the assumption that welded structures were made of structural steels S355 and
S235. Investigation of causes of damage occurrence are based on results of non-destructive tests
(NDT) and tensometric measurements.
PB  - Trans Tech Publications Ltd, Switzerland
T2  - Engineering Innovations
T1  - Damage occurrence in welded structures of the bucket-wheel boom
EP  - 48
SP  - 41
VL  - 2
DO  - 10.4028/p-15iqnw
ER  - 
@article{
author = "Arsić, Miodrag and Flajs, Željko and Sedmak, Aleksandar and Veg, Emil and Sedmak, Simon",
year = "2022",
abstract = "Causes of damage occurrence in vital components of welded structures of the bucket-wheel
excavator boom (DU1) at the coal landfill of the thermal power plant 'Nikola Tesla A' in Obrenovac
(Serbia) are investigated. Bucket-wheel excavator was produced by French company 'Ameco' and it
moves along the circular track. Taking into account lack of technical documentation, all tests and
were carried out under the assumption that welded structures were made of structural steels S355 and
S235. Investigation of causes of damage occurrence are based on results of non-destructive tests
(NDT) and tensometric measurements.",
publisher = "Trans Tech Publications Ltd, Switzerland",
journal = "Engineering Innovations",
title = "Damage occurrence in welded structures of the bucket-wheel boom",
pages = "48-41",
volume = "2",
doi = "10.4028/p-15iqnw"
}
Arsić, M., Flajs, Ž., Sedmak, A., Veg, E.,& Sedmak, S.. (2022). Damage occurrence in welded structures of the bucket-wheel boom. in Engineering Innovations
Trans Tech Publications Ltd, Switzerland., 2, 41-48.
https://doi.org/10.4028/p-15iqnw
Arsić M, Flajs Ž, Sedmak A, Veg E, Sedmak S. Damage occurrence in welded structures of the bucket-wheel boom. in Engineering Innovations. 2022;2:41-48.
doi:10.4028/p-15iqnw .
Arsić, Miodrag, Flajs, Željko, Sedmak, Aleksandar, Veg, Emil, Sedmak, Simon, "Damage occurrence in welded structures of the bucket-wheel boom" in Engineering Innovations, 2 (2022):41-48,
https://doi.org/10.4028/p-15iqnw . .

Structural integrity assessment of welded bucket-wheel boom

Arsić, Miodrag; Flajs, Željko; Sedmak, Aleksandar; Veg, Emil; Sedmak, Simon

(Institut za ispitivanje materijala, Beograd, 2021)

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Flajs, Željko
AU  - Sedmak, Aleksandar
AU  - Veg, Emil
AU  - Sedmak, Simon
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/411
AB  - Research is conducted on the causes of damage and the structural integrity assessment of the bucket-wheel boom welded lattice structures, before and after the repair of vital structures. Additionally, the paper describes the investigation conducted based on the results of non-destructive tests (visual-, magnetic particle-, dye penetrant-, and ultrasonic tests), results of tensometric measurements that refer to the stress-strain state, and results based on numerical calculation of stresses by finite element method, performed through the use of a 3D model in the software Radimpex Tower 6.0 (R). The results of tests and research performed after the repair of damaged structural welded sections show that the operational procedures are being obeyed.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Structural integrity assessment of welded bucket-wheel boom
EP  - 206
IS  - 2
SP  - 201
VL  - 21
UR  - https://hdl.handle.net/21.15107/rcub_rims_411
ER  - 
@article{
author = "Arsić, Miodrag and Flajs, Željko and Sedmak, Aleksandar and Veg, Emil and Sedmak, Simon",
year = "2021",
abstract = "Research is conducted on the causes of damage and the structural integrity assessment of the bucket-wheel boom welded lattice structures, before and after the repair of vital structures. Additionally, the paper describes the investigation conducted based on the results of non-destructive tests (visual-, magnetic particle-, dye penetrant-, and ultrasonic tests), results of tensometric measurements that refer to the stress-strain state, and results based on numerical calculation of stresses by finite element method, performed through the use of a 3D model in the software Radimpex Tower 6.0 (R). The results of tests and research performed after the repair of damaged structural welded sections show that the operational procedures are being obeyed.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Structural integrity assessment of welded bucket-wheel boom",
pages = "206-201",
number = "2",
volume = "21",
url = "https://hdl.handle.net/21.15107/rcub_rims_411"
}
Arsić, M., Flajs, Ž., Sedmak, A., Veg, E.,& Sedmak, S.. (2021). Structural integrity assessment of welded bucket-wheel boom. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 21(2), 201-206.
https://hdl.handle.net/21.15107/rcub_rims_411
Arsić M, Flajs Ž, Sedmak A, Veg E, Sedmak S. Structural integrity assessment of welded bucket-wheel boom. in Structural Integrity and Life. 2021;21(2):201-206.
https://hdl.handle.net/21.15107/rcub_rims_411 .
Arsić, Miodrag, Flajs, Željko, Sedmak, Aleksandar, Veg, Emil, Sedmak, Simon, "Structural integrity assessment of welded bucket-wheel boom" in Structural Integrity and Life, 21, no. 2 (2021):201-206,
https://hdl.handle.net/21.15107/rcub_rims_411 .

The effect of aftershock on 2D RC frame founded on piles with P-Y curves

Folić, Boris; Ćosić, Mladen; Brčić, Stanko; Čokić, Miloš; Sedmak, Simon

(Association of civil engineers of Serbia (ACES), 2019)

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 .

Repair of cracks detected in cast components of vertical Kaplan turbine rotor hub

Arsić, Miodrag; Bošnjak, Srđan; Sedmak, Simon; Vistać, Brane; Savić, Zoran

(Institut za ispitivanje materijala, Beograd, 2019)

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Sedmak, Simon
AU  - Vistać, Brane
AU  - Savić, Zoran
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/361
AB  - During the revitalization of the hydroelectric generating station A4 at the hydro power plant 'Djerdap 1', all of its parts are subjected to non-destructive testing. Cracks are detected in cast part of generator rotor hub, in the flange area toward the turbine shaft. Cracks were 10-500 mm long (determined by magnetic particle tests) and 60-100 mm deep (ultrasonic tests). The generator rotor hub is made of cast steel 25L, in accordance with the standard 977-75. The welding/surface welding repair technology in the detected crack zones of the cast part of generator rotor hub includes a large number of details, due to the structural solution and generator rotor function in service. It was also necessary to provide the carefully undertaken activities in order to enable safe operation and continuous use of the rotor hub. Failing to notice, underestimation or incorrect perception of important details could cause significant problems in hydroelectric generating station operation. The paper, due to specifics of reparation technology, contains arranged preparatory activities for the procedure apart from the welding/surface welding technology. It is of importance to mention a huge amount of money savings, The manufacture of a new generator rotor would cost over 4 million EUR (generator mass is over 300 tonnes), not taking into account the time needed for its making (6-12 months), which is directly related to the amount of energy a hydroelectric generating station can produce during that period. This technology of repair welding is also applicable for other components and structures of the turbine and the hydromechanical equipment subjected to various causes of damage during exploitation.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Repair of cracks detected in cast components of vertical Kaplan turbine rotor hub
EP  - 250
IS  - 3
SP  - 243
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_rims_361
ER  - 
@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Sedmak, Simon and Vistać, Brane and Savić, Zoran",
year = "2019",
abstract = "During the revitalization of the hydroelectric generating station A4 at the hydro power plant 'Djerdap 1', all of its parts are subjected to non-destructive testing. Cracks are detected in cast part of generator rotor hub, in the flange area toward the turbine shaft. Cracks were 10-500 mm long (determined by magnetic particle tests) and 60-100 mm deep (ultrasonic tests). The generator rotor hub is made of cast steel 25L, in accordance with the standard 977-75. The welding/surface welding repair technology in the detected crack zones of the cast part of generator rotor hub includes a large number of details, due to the structural solution and generator rotor function in service. It was also necessary to provide the carefully undertaken activities in order to enable safe operation and continuous use of the rotor hub. Failing to notice, underestimation or incorrect perception of important details could cause significant problems in hydroelectric generating station operation. The paper, due to specifics of reparation technology, contains arranged preparatory activities for the procedure apart from the welding/surface welding technology. It is of importance to mention a huge amount of money savings, The manufacture of a new generator rotor would cost over 4 million EUR (generator mass is over 300 tonnes), not taking into account the time needed for its making (6-12 months), which is directly related to the amount of energy a hydroelectric generating station can produce during that period. This technology of repair welding is also applicable for other components and structures of the turbine and the hydromechanical equipment subjected to various causes of damage during exploitation.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Repair of cracks detected in cast components of vertical Kaplan turbine rotor hub",
pages = "250-243",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_rims_361"
}
Arsić, M., Bošnjak, S., Sedmak, S., Vistać, B.,& Savić, Z.. (2019). Repair of cracks detected in cast components of vertical Kaplan turbine rotor hub. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 19(3), 243-250.
https://hdl.handle.net/21.15107/rcub_rims_361
Arsić M, Bošnjak S, Sedmak S, Vistać B, Savić Z. Repair of cracks detected in cast components of vertical Kaplan turbine rotor hub. in Structural Integrity and Life. 2019;19(3):243-250.
https://hdl.handle.net/21.15107/rcub_rims_361 .
Arsić, Miodrag, Bošnjak, Srđan, Sedmak, Simon, Vistać, Brane, Savić, Zoran, "Repair of cracks detected in cast components of vertical Kaplan turbine rotor hub" in Structural Integrity and Life, 19, no. 3 (2019):243-250,
https://hdl.handle.net/21.15107/rcub_rims_361 .
1
5

Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes

Međo, Bojan; Arsić, Miodrag; Rakin, M.; Sedmak, Simon; Savić, Zoran

(Institut za ispitivanje materijala, Beograd, 2018)

TY  - JOUR
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Rakin, M.
AU  - Sedmak, Simon
AU  - Savić, Zoran
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/343
AB  - Vital components of the beam that enable conjoint operation of two bridge cranes are braces and threaded spindle. The beam connects two bridge cranes with overall lifting capacity of 500 t (2 × 250 t) and enables their simultaneous conjoint operation during the rehabilitation or major overhaul of hydroelectric generating set equipment at the hydro power plant ‘'Djerdap 2’. Two braces are being installed instead of two hooks when this situation occurs. The threaded spindle is loaded with 500 t (5 MN), while braces are loaded with 250 t (2.5 MN) each. Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises condition analysis, behaviour diagnostics, service life evaluation and rehabilitation of structures, which means that beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw is detected by means of non-destructive tests, this discipline also comprises stress condition analysis for the crackless structure, most often through the use of finite element method. This is the way to obtain precise and detailed distribution of displacements, deformations and stresses, which enables determination of weak spots on the structure, even before crack initiation. Non-destructive tests are performed in order to analyse the current condition of braces and the threaded spindle. On the basis of performed analytical calculations it is determined that the integrity is not threatened, although some internal non-homogeneities are detected by ultrasonic testing.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes
EP  - 59
IS  - 1
SP  - 53
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3791
ER  - 
@article{
author = "Međo, Bojan and Arsić, Miodrag and Rakin, M. and Sedmak, Simon and Savić, Zoran",
year = "2018",
abstract = "Vital components of the beam that enable conjoint operation of two bridge cranes are braces and threaded spindle. The beam connects two bridge cranes with overall lifting capacity of 500 t (2 × 250 t) and enables their simultaneous conjoint operation during the rehabilitation or major overhaul of hydroelectric generating set equipment at the hydro power plant ‘'Djerdap 2’. Two braces are being installed instead of two hooks when this situation occurs. The threaded spindle is loaded with 500 t (5 MN), while braces are loaded with 250 t (2.5 MN) each. Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises condition analysis, behaviour diagnostics, service life evaluation and rehabilitation of structures, which means that beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw is detected by means of non-destructive tests, this discipline also comprises stress condition analysis for the crackless structure, most often through the use of finite element method. This is the way to obtain precise and detailed distribution of displacements, deformations and stresses, which enables determination of weak spots on the structure, even before crack initiation. Non-destructive tests are performed in order to analyse the current condition of braces and the threaded spindle. On the basis of performed analytical calculations it is determined that the integrity is not threatened, although some internal non-homogeneities are detected by ultrasonic testing.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes",
pages = "59-53",
number = "1",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3791"
}
Međo, B., Arsić, M., Rakin, M., Sedmak, S.,& Savić, Z.. (2018). Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 18(1), 53-59.
https://hdl.handle.net/21.15107/rcub_technorep_3791
Međo B, Arsić M, Rakin M, Sedmak S, Savić Z. Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes. in Structural Integrity and Life. 2018;18(1):53-59.
https://hdl.handle.net/21.15107/rcub_technorep_3791 .
Međo, Bojan, Arsić, Miodrag, Rakin, M., Sedmak, Simon, Savić, Zoran, "Integrity assessment of vital beam components that enable conjoint operation of two bridge cranes" in Structural Integrity and Life, 18, no. 1 (2018):53-59,
https://hdl.handle.net/21.15107/rcub_technorep_3791 .
1

Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics

Arsić, Miodrag; Bošnjak, Srđan; Gnjatović, Nebojša; Sedmak, Simon; Arsić, D.; Savić, Zoran

(Elsevier Science Bv, Amsterdam, 2018)

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Gnjatović, Nebojša
AU  - Sedmak, Simon
AU  - Arsić, D.
AU  - Savić, Zoran
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/334
AB  - This paper presents a methodological approach for the assessment of service life of vital welded structures of a bucket-wheel excavator Sch Rs 650/5x24 ('Thyssen Krupp', Germany) boom, subjected to cyclic loading with a variable amplitude through the use of experimental tests carried out in order to determine operational strength and growth of a fatigue crack. Realized researches and results presented in this paper offer great possibilities for the analyses of behaviour of vital welded structures of the bucket-wheel boom. By the application of the measurement device with 8 channels for registration and processing of electric signals HBM Spider 8 and measurement tapes HBM 6/350xXY31 deformations were measured at vital welded structures of the boom in the area of the bucket-wheel, made of steels St 37.2 and St 52.3 in accordance with standard DIN 17100, or steels S235J2G3 and S355J2G3 in accordance with standard EN 10025-2. The objective of the test is to determine if there is a possibility of occurrence of plastic deformations or initial cracks due to fatigue at vital welded structures. Tests that refer to the growth of the fatigue crack located at the welded joint have been carried out by bending at three points with asymmetric load R = 0.5 (R = sigma(min) / sigma(max)) at the specimen with a single edge notch. Tests were performed through the use of controlled force, ranging between F-max and F-min at the high frequency pulsator 'Cracktronic', while obtainment of data regarding the crack growth was carried out through the use of measurement gauge ARM A-10.
PB  - Elsevier Science Bv, Amsterdam
C3  - ECF22 - Loading and Environmental Effects on Structural Integrity
T1  - Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics
EP  - 84
SP  - 79
VL  - 13
DO  - 10.1016/j.prostr.2018.12.014
ER  - 
@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Gnjatović, Nebojša and Sedmak, Simon and Arsić, D. and Savić, Zoran",
year = "2018",
abstract = "This paper presents a methodological approach for the assessment of service life of vital welded structures of a bucket-wheel excavator Sch Rs 650/5x24 ('Thyssen Krupp', Germany) boom, subjected to cyclic loading with a variable amplitude through the use of experimental tests carried out in order to determine operational strength and growth of a fatigue crack. Realized researches and results presented in this paper offer great possibilities for the analyses of behaviour of vital welded structures of the bucket-wheel boom. By the application of the measurement device with 8 channels for registration and processing of electric signals HBM Spider 8 and measurement tapes HBM 6/350xXY31 deformations were measured at vital welded structures of the boom in the area of the bucket-wheel, made of steels St 37.2 and St 52.3 in accordance with standard DIN 17100, or steels S235J2G3 and S355J2G3 in accordance with standard EN 10025-2. The objective of the test is to determine if there is a possibility of occurrence of plastic deformations or initial cracks due to fatigue at vital welded structures. Tests that refer to the growth of the fatigue crack located at the welded joint have been carried out by bending at three points with asymmetric load R = 0.5 (R = sigma(min) / sigma(max)) at the specimen with a single edge notch. Tests were performed through the use of controlled force, ranging between F-max and F-min at the high frequency pulsator 'Cracktronic', while obtainment of data regarding the crack growth was carried out through the use of measurement gauge ARM A-10.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "ECF22 - Loading and Environmental Effects on Structural Integrity",
title = "Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics",
pages = "84-79",
volume = "13",
doi = "10.1016/j.prostr.2018.12.014"
}
Arsić, M., Bošnjak, S., Gnjatović, N., Sedmak, S., Arsić, D.,& Savić, Z.. (2018). Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics. in ECF22 - Loading and Environmental Effects on Structural Integrity
Elsevier Science Bv, Amsterdam., 13, 79-84.
https://doi.org/10.1016/j.prostr.2018.12.014
Arsić M, Bošnjak S, Gnjatović N, Sedmak S, Arsić D, Savić Z. Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics. in ECF22 - Loading and Environmental Effects on Structural Integrity. 2018;13:79-84.
doi:10.1016/j.prostr.2018.12.014 .
Arsić, Miodrag, Bošnjak, Srđan, Gnjatović, Nebojša, Sedmak, Simon, Arsić, D., Savić, Zoran, "Determination of Residual Fatigue Life of Welded Structures at Bucket-Wheel Excavators through the Use of Fracture Mechanics" in ECF22 - Loading and Environmental Effects on Structural Integrity, 13 (2018):79-84,
https://doi.org/10.1016/j.prostr.2018.12.014 . .
6
4
7

Neki slučajevi oštećenja i sanacije srednjeg rama mosta nakon zemljotresa

Folić, Boris; Ćosić, Mladen; Lađinović, Đorđe; Sedmak, Simon

(Savez građevinskih inženjera Srbije, Vršac, 2017)

TY  - CONF
AU  - Folić, Boris
AU  - Ćosić, Mladen
AU  - Lađinović, Đorđe
AU  - Sedmak, Simon
PY  - 2017
UR  - http://rims.institutims.rs/handle/123456789/728
PB  - Savez građevinskih inženjera Srbije, Vršac
C3  - Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, X naučno-stručno savetovanje, Vršac, Srbija
T1  - Neki slučajevi oštećenja i sanacije srednjeg rama mosta nakon zemljotresa
EP  - 112
SP  - 105
UR  - https://hdl.handle.net/21.15107/rcub_rims_728
ER  - 
@conference{
author = "Folić, Boris and Ćosić, Mladen and Lađinović, Đorđe and Sedmak, Simon",
year = "2017",
publisher = "Savez građevinskih inženjera Srbije, Vršac",
journal = "Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, X naučno-stručno savetovanje, Vršac, Srbija",
title = "Neki slučajevi oštećenja i sanacije srednjeg rama mosta nakon zemljotresa",
pages = "112-105",
url = "https://hdl.handle.net/21.15107/rcub_rims_728"
}
Folić, B., Ćosić, M., Lađinović, Đ.,& Sedmak, S.. (2017). Neki slučajevi oštećenja i sanacije srednjeg rama mosta nakon zemljotresa. in Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, X naučno-stručno savetovanje, Vršac, Srbija
Savez građevinskih inženjera Srbije, Vršac., 105-112.
https://hdl.handle.net/21.15107/rcub_rims_728
Folić B, Ćosić M, Lađinović Đ, Sedmak S. Neki slučajevi oštećenja i sanacije srednjeg rama mosta nakon zemljotresa. in Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, X naučno-stručno savetovanje, Vršac, Srbija. 2017;:105-112.
https://hdl.handle.net/21.15107/rcub_rims_728 .
Folić, Boris, Ćosić, Mladen, Lađinović, Đorđe, Sedmak, Simon, "Neki slučajevi oštećenja i sanacije srednjeg rama mosta nakon zemljotresa" in Ocena stanja, održavanje i sanacija građevinskih objekata i naselja, X naučno-stručno savetovanje, Vršac, Srbija (2017):105-112,
https://hdl.handle.net/21.15107/rcub_rims_728 .

Uticaj promene parametara tla u osnovi objekta na krutost šipova i opruga

Folić, Boris; Ćosić, Mladen; Lađinović, Đorđe; Sedmak, Simon

(Savez građevinskih inženjera Srbije, 2014)

TY  - CONF
AU  - Folić, Boris
AU  - Ćosić, Mladen
AU  - Lađinović, Đorđe
AU  - Sedmak, Simon
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/726
AB  - У овом раду приказани су неки случејеви утицаја промена параметара тла на варијације опруга као модела тла, затим крутости шипова и опруга којима се замењује систем шип-тло. Код истраживања статичке или динамичке интеракције конструкција-тло уобичајено је увођење опруга, било као замена утицаја тла у рамовском моделу или као спој конструкције и тла у просторном моделу. Промена параметара тла која у суштини представља виско-еласто-пластичну средину може бити у временским и просторсторним координатама.
PB  - Savez građevinskih inženjera Srbije
C3  - IV naučno-stručno savetovanje, Zemljotresno inženjerstvo i inženjerska seizmologija
T1  - Uticaj promene parametara tla u osnovi objekta na krutost šipova i opruga
EP  - 132
SP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_rims_726
ER  - 
@conference{
author = "Folić, Boris and Ćosić, Mladen and Lađinović, Đorđe and Sedmak, Simon",
year = "2014",
abstract = "У овом раду приказани су неки случејеви утицаја промена параметара тла на варијације опруга као модела тла, затим крутости шипова и опруга којима се замењује систем шип-тло. Код истраживања статичке или динамичке интеракције конструкција-тло уобичајено је увођење опруга, било као замена утицаја тла у рамовском моделу или као спој конструкције и тла у просторном моделу. Промена параметара тла која у суштини представља виско-еласто-пластичну средину може бити у временским и просторсторним координатама.",
publisher = "Savez građevinskih inženjera Srbije",
journal = "IV naučno-stručno savetovanje, Zemljotresno inženjerstvo i inženjerska seizmologija",
title = "Uticaj promene parametara tla u osnovi objekta na krutost šipova i opruga",
pages = "132-123",
url = "https://hdl.handle.net/21.15107/rcub_rims_726"
}
Folić, B., Ćosić, M., Lađinović, Đ.,& Sedmak, S.. (2014). Uticaj promene parametara tla u osnovi objekta na krutost šipova i opruga. in IV naučno-stručno savetovanje, Zemljotresno inženjerstvo i inženjerska seizmologija
Savez građevinskih inženjera Srbije., 123-132.
https://hdl.handle.net/21.15107/rcub_rims_726
Folić B, Ćosić M, Lađinović Đ, Sedmak S. Uticaj promene parametara tla u osnovi objekta na krutost šipova i opruga. in IV naučno-stručno savetovanje, Zemljotresno inženjerstvo i inženjerska seizmologija. 2014;:123-132.
https://hdl.handle.net/21.15107/rcub_rims_726 .
Folić, Boris, Ćosić, Mladen, Lađinović, Đorđe, Sedmak, Simon, "Uticaj promene parametara tla u osnovi objekta na krutost šipova i opruga" in IV naučno-stručno savetovanje, Zemljotresno inženjerstvo i inženjerska seizmologija (2014):123-132,
https://hdl.handle.net/21.15107/rcub_rims_726 .

Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj

Ćosić, Mladen; Folić, Boris; Folić, Radomir; Sedmak, Simon

(Beograd : Društvo za integritet i vek konstrukcija, 2014)

TY  - JOUR
AU  - Ćosić, Mladen
AU  - Folić, Boris
AU  - Folić, Radomir
AU  - Sedmak, Simon
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/619
AB  - Presented in this paper are the results of the analysis of seismic performances of an overpass founded on piles, in interaction with the soil, located over the E75 Highway Novi Sad - Belgrade, as part of the Kovilj loop. Applied methods include: non-linear static push-over (NSPA) analysis, target displacement analysis, parametric target displacement analysis, vulnerability and reliability analy-sis. The overpass is modelled and taken into consideration for seismic effects along its transverse direction as a 2D planar model. Modelling of elastic-plastic strain is performed using plastic hinges, whereas the development of non-linear strain is considered using the incremental-itera-tive method. It is determined that the failure mechanism of the system occurred because of the plasticization of column ends, and it is maintained as such until the end of the non-linear analysis, along with the changes of performance states in plastic hinges. System vulnerability analysis has shown that up until the point where Sa = 0.2g, nearly all levels of damage are initiated, however, already at values of Sa ≈ 0.3g, significant damages to the overpass are ex-pected along the transverse direction with the probability of P ≈ 1. On the other hand, reliability analysis of the over-pass shows that reliability of R > 0 is achieved for Sa < 0.23g for levels of significant damage and for lower ones.
PB  - Beograd : Društvo za integritet i vek konstrukcija
PB  - Smederevska Palanka : Goša Institut
T2  - Integritet i vek konstrukcija
T1  - Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj
EP  - 28
IS  - 1
SP  - 17
VL  - 4
UR  - https://hdl.handle.net/21.15107/rcub_rims_619
ER  - 
@article{
author = "Ćosić, Mladen and Folić, Boris and Folić, Radomir and Sedmak, Simon",
year = "2014",
abstract = "Presented in this paper are the results of the analysis of seismic performances of an overpass founded on piles, in interaction with the soil, located over the E75 Highway Novi Sad - Belgrade, as part of the Kovilj loop. Applied methods include: non-linear static push-over (NSPA) analysis, target displacement analysis, parametric target displacement analysis, vulnerability and reliability analy-sis. The overpass is modelled and taken into consideration for seismic effects along its transverse direction as a 2D planar model. Modelling of elastic-plastic strain is performed using plastic hinges, whereas the development of non-linear strain is considered using the incremental-itera-tive method. It is determined that the failure mechanism of the system occurred because of the plasticization of column ends, and it is maintained as such until the end of the non-linear analysis, along with the changes of performance states in plastic hinges. System vulnerability analysis has shown that up until the point where Sa = 0.2g, nearly all levels of damage are initiated, however, already at values of Sa ≈ 0.3g, significant damages to the overpass are ex-pected along the transverse direction with the probability of P ≈ 1. On the other hand, reliability analysis of the over-pass shows that reliability of R > 0 is achieved for Sa < 0.23g for levels of significant damage and for lower ones.",
publisher = "Beograd : Društvo za integritet i vek konstrukcija, Smederevska Palanka : Goša Institut",
journal = "Integritet i vek konstrukcija",
title = "Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj",
pages = "28-17",
number = "1",
volume = "4",
url = "https://hdl.handle.net/21.15107/rcub_rims_619"
}
Ćosić, M., Folić, B., Folić, R.,& Sedmak, S.. (2014). Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj. in Integritet i vek konstrukcija
Beograd : Društvo za integritet i vek konstrukcija., 4(1), 17-28.
https://hdl.handle.net/21.15107/rcub_rims_619
Ćosić M, Folić B, Folić R, Sedmak S. Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj. in Integritet i vek konstrukcija. 2014;4(1):17-28.
https://hdl.handle.net/21.15107/rcub_rims_619 .
Ćosić, Mladen, Folić, Boris, Folić, Radomir, Sedmak, Simon, "Performance-Based Seismic Analysis of Highway E75 Overpass at Kovilj" in Integritet i vek konstrukcija, 4, no. 1 (2014):17-28,
https://hdl.handle.net/21.15107/rcub_rims_619 .

The Forming of the Bridge Structure Founded on RC Piles and Solution for Seismic Strengthening a Middle Frame

Folić, Boris; Sedmak, Simon; Ćosić, Mladen; Lađinović, Đorđe

(Faculty of Manufacturing Technologies with a seat in Prešov, Technical University of Košice, Slovačka, 2013)

TY  - CONF
AU  - Folić, Boris
AU  - Sedmak, Simon
AU  - Ćosić, Mladen
AU  - Lađinović, Đorđe
PY  - 2013
UR  - http://rims.institutims.rs/handle/123456789/737
AB  - In this paper a brief review of construction of an overpass and possible methods and certain criteria of choice of seismic strengthening of the middle frame is presented. The calculation of the existing bridge-overpass using non-linear dynamic analysis (NDA) via time history (TH) while taking into account dynamic interactions between the foundations and soil is also given. In a soil-pile-structure system, the structure is modeled, including interaction effects, by using p-y curves for sand, as a link element, according to Reese model. The order of appearance of plastic hinges was analyzed.
PB  - Faculty of Manufacturing Technologies with a seat in Prešov, Technical University of Košice, Slovačka
C3  - TEAM, 5th International Scientific and Expert Conference, Prešov, Slovakia
T1  - The Forming of the Bridge Structure Founded on RC Piles and Solution for Seismic Strengthening a Middle Frame
EP  - 419
IS  - 1
SP  - 416
VL  - 5
UR  - https://hdl.handle.net/21.15107/rcub_rims_737
ER  - 
@conference{
author = "Folić, Boris and Sedmak, Simon and Ćosić, Mladen and Lađinović, Đorđe",
year = "2013",
abstract = "In this paper a brief review of construction of an overpass and possible methods and certain criteria of choice of seismic strengthening of the middle frame is presented. The calculation of the existing bridge-overpass using non-linear dynamic analysis (NDA) via time history (TH) while taking into account dynamic interactions between the foundations and soil is also given. In a soil-pile-structure system, the structure is modeled, including interaction effects, by using p-y curves for sand, as a link element, according to Reese model. The order of appearance of plastic hinges was analyzed.",
publisher = "Faculty of Manufacturing Technologies with a seat in Prešov, Technical University of Košice, Slovačka",
journal = "TEAM, 5th International Scientific and Expert Conference, Prešov, Slovakia",
title = "The Forming of the Bridge Structure Founded on RC Piles and Solution for Seismic Strengthening a Middle Frame",
pages = "419-416",
number = "1",
volume = "5",
url = "https://hdl.handle.net/21.15107/rcub_rims_737"
}
Folić, B., Sedmak, S., Ćosić, M.,& Lađinović, Đ.. (2013). The Forming of the Bridge Structure Founded on RC Piles and Solution for Seismic Strengthening a Middle Frame. in TEAM, 5th International Scientific and Expert Conference, Prešov, Slovakia
Faculty of Manufacturing Technologies with a seat in Prešov, Technical University of Košice, Slovačka., 5(1), 416-419.
https://hdl.handle.net/21.15107/rcub_rims_737
Folić B, Sedmak S, Ćosić M, Lađinović Đ. The Forming of the Bridge Structure Founded on RC Piles and Solution for Seismic Strengthening a Middle Frame. in TEAM, 5th International Scientific and Expert Conference, Prešov, Slovakia. 2013;5(1):416-419.
https://hdl.handle.net/21.15107/rcub_rims_737 .
Folić, Boris, Sedmak, Simon, Ćosić, Mladen, Lađinović, Đorđe, "The Forming of the Bridge Structure Founded on RC Piles and Solution for Seismic Strengthening a Middle Frame" in TEAM, 5th International Scientific and Expert Conference, Prešov, Slovakia, 5, no. 1 (2013):416-419,
https://hdl.handle.net/21.15107/rcub_rims_737 .

Analiza stabilnosti vitkog 3D modela šipa u interakciji sa tlom metodom konačnih elemenata

Ćosić, Mladen; Folić, Boris; Sedmak, Simon

(Društvo za integritet i vek konstrukcija Srbije, 2012)

TY  - JOUR
AU  - Ćosić, Mladen
AU  - Folić, Boris
AU  - Sedmak, Simon
PY  - 2012
UR  - http://rims.institutims.rs/handle/123456789/620
AB  - The paper describes the modelling and stability analysis of slender piles using finite element method. The concept of a modified stability analysis of 3D model pile–soil–pile cap is formulated; it is formed from solid finite element models for the two types of soil, and a single-pile. Connection in pile–soil contact is modelled using link elements. The terms of the level of normalised critical load Pcr/PE 3D model of pile–soil–pile cap are derived using regression analysis of the power function.
On the basis of performed numerical tests and regres-sion analyses expressions are derived for the buckling length coefficient  as a function of pile length, pile stiff-ness and soil stiffness. Research has shown that the use of sophisticated mathematical models and numerical analysis is justified and necessary in order to gain better insight into the behaviour of slender piles in terms of stability. The paper points to the complex shape of the buckling of slender piles with a number of half waves.
PB  - Društvo za integritet i vek konstrukcija Srbije
PB  - Institut IMS
T2  - Integritet i vek konstrukcija
T1  - Analiza stabilnosti vitkog 3D modela šipa u interakciji sa tlom metodom konačnih elemenata
EP  - 232
IS  - 3
SP  - 221
VL  - 12
UR  - https://hdl.handle.net/21.15107/rcub_rims_620
ER  - 
@article{
author = "Ćosić, Mladen and Folić, Boris and Sedmak, Simon",
year = "2012",
abstract = "The paper describes the modelling and stability analysis of slender piles using finite element method. The concept of a modified stability analysis of 3D model pile–soil–pile cap is formulated; it is formed from solid finite element models for the two types of soil, and a single-pile. Connection in pile–soil contact is modelled using link elements. The terms of the level of normalised critical load Pcr/PE 3D model of pile–soil–pile cap are derived using regression analysis of the power function.
On the basis of performed numerical tests and regres-sion analyses expressions are derived for the buckling length coefficient  as a function of pile length, pile stiff-ness and soil stiffness. Research has shown that the use of sophisticated mathematical models and numerical analysis is justified and necessary in order to gain better insight into the behaviour of slender piles in terms of stability. The paper points to the complex shape of the buckling of slender piles with a number of half waves.",
publisher = "Društvo za integritet i vek konstrukcija Srbije, Institut IMS",
journal = "Integritet i vek konstrukcija",
title = "Analiza stabilnosti vitkog 3D modela šipa u interakciji sa tlom metodom konačnih elemenata",
pages = "232-221",
number = "3",
volume = "12",
url = "https://hdl.handle.net/21.15107/rcub_rims_620"
}
Ćosić, M., Folić, B.,& Sedmak, S.. (2012). Analiza stabilnosti vitkog 3D modela šipa u interakciji sa tlom metodom konačnih elemenata. in Integritet i vek konstrukcija
Društvo za integritet i vek konstrukcija Srbije., 12(3), 221-232.
https://hdl.handle.net/21.15107/rcub_rims_620
Ćosić M, Folić B, Sedmak S. Analiza stabilnosti vitkog 3D modela šipa u interakciji sa tlom metodom konačnih elemenata. in Integritet i vek konstrukcija. 2012;12(3):221-232.
https://hdl.handle.net/21.15107/rcub_rims_620 .
Ćosić, Mladen, Folić, Boris, Sedmak, Simon, "Analiza stabilnosti vitkog 3D modela šipa u interakciji sa tlom metodom konačnih elemenata" in Integritet i vek konstrukcija, 12, no. 3 (2012):221-232,
https://hdl.handle.net/21.15107/rcub_rims_620 .