Numerical Simulation of the Pile Integrity Test on Defected Piles
Abstract
This paper deals with the development of a discrete numerical 2D and 3D solid pile model with a discontinuity and defects to simulate non-destructive testing using the pile integrity test (PIT). The pile discontinuity and defects were modelled by reducing the specific finite elements and the 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 the time domain. The concept of a system-response analysis was originally formulated based on the integration of individual reflectograms into a reflectogram surface, which is generated in a 3D cylindrical coordinate system. The use of reflectogram surfaces enables an understanding of wave propagation based on their velocity to a higher level than is usually the case with standard, one-dimensional reflectograms. Changes in the velocity responses on the reflectogram, shifting from a positive to a negative value, point to the ...locations of discontinuities and defects in the discrete 3D pile model, and there is a clear difference in the reflectograms, depending on the position of the measuring point. The study defines the typological models of the reflectogram: without discontinuities and defects, pile-head defect, defect in the middle of the pile length or a reduced modulus of elasticity in the middle of the pile length, pile-base defect or reduced modulus of elasticity in the pile-base zone and reduced modulus of elasticity in the pile-head zone.
Keywords:
reflectogram surface / numerical pile model / solid finite elementsSource:
Acta Geotechnica Slovenica, 2014, 11, 2, 5-19Publisher:
- University of Maribor
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Institution/Community
Institut za ispitivanje materijalaTY - JOUR AU - Ćosić, Mladen AU - Folić, Boris AU - Folić, Radomir PY - 2014 UR - http://rims.institutims.rs/handle/123456789/763 AB - This paper deals with the development of a discrete numerical 2D and 3D solid pile model with a discontinuity and defects to simulate non-destructive testing using the pile integrity test (PIT). The pile discontinuity and defects were modelled by reducing the specific finite elements and the 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 the time domain. The concept of a system-response analysis was originally formulated based on the integration of individual reflectograms into a reflectogram surface, which is generated in a 3D cylindrical coordinate system. The use of reflectogram surfaces enables an understanding of wave propagation based on their velocity to a higher level than is usually the case with standard, one-dimensional reflectograms. Changes in the velocity responses on the reflectogram, shifting from a positive to a negative value, point to the locations of discontinuities and defects in the discrete 3D pile model, and there is a clear difference in the reflectograms, depending on the position of the measuring point. The study defines the typological models of the reflectogram: without discontinuities and defects, pile-head defect, defect in the middle of the pile length or a reduced modulus of elasticity in the middle of the pile length, pile-base defect or reduced modulus of elasticity in the pile-base zone and reduced modulus of elasticity in the pile-head zone. PB - University of Maribor T2 - Acta Geotechnica Slovenica T1 - Numerical Simulation of the Pile Integrity Test on Defected Piles EP - 19 IS - 2 SP - 5 VL - 11 UR - https://hdl.handle.net/21.15107/rcub_rims_763 ER -
@article{ author = "Ćosić, Mladen and Folić, Boris and Folić, Radomir", year = "2014", abstract = "This paper deals with the development of a discrete numerical 2D and 3D solid pile model with a discontinuity and defects to simulate non-destructive testing using the pile integrity test (PIT). The pile discontinuity and defects were modelled by reducing the specific finite elements and the 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 the time domain. The concept of a system-response analysis was originally formulated based on the integration of individual reflectograms into a reflectogram surface, which is generated in a 3D cylindrical coordinate system. The use of reflectogram surfaces enables an understanding of wave propagation based on their velocity to a higher level than is usually the case with standard, one-dimensional reflectograms. Changes in the velocity responses on the reflectogram, shifting from a positive to a negative value, point to the locations of discontinuities and defects in the discrete 3D pile model, and there is a clear difference in the reflectograms, depending on the position of the measuring point. The study defines the typological models of the reflectogram: without discontinuities and defects, pile-head defect, defect in the middle of the pile length or a reduced modulus of elasticity in the middle of the pile length, pile-base defect or reduced modulus of elasticity in the pile-base zone and reduced modulus of elasticity in the pile-head zone.", publisher = "University of Maribor", journal = "Acta Geotechnica Slovenica", title = "Numerical Simulation of the Pile Integrity Test on Defected Piles", pages = "19-5", number = "2", volume = "11", url = "https://hdl.handle.net/21.15107/rcub_rims_763" }
Ćosić, M., Folić, B.,& Folić, R.. (2014). Numerical Simulation of the Pile Integrity Test on Defected Piles. in Acta Geotechnica Slovenica University of Maribor., 11(2), 5-19. https://hdl.handle.net/21.15107/rcub_rims_763
Ćosić M, Folić B, Folić R. Numerical Simulation of the Pile Integrity Test on Defected Piles. in Acta Geotechnica Slovenica. 2014;11(2):5-19. https://hdl.handle.net/21.15107/rcub_rims_763 .
Ćosić, Mladen, Folić, Boris, Folić, Radomir, "Numerical Simulation of the Pile Integrity Test on Defected Piles" in Acta Geotechnica Slovenica, 11, no. 2 (2014):5-19, https://hdl.handle.net/21.15107/rcub_rims_763 .