Seismic safety assessment of pile supported long span highway bridges: Non homogeneous soil conditions and multiple support excitations. Jaworski, J., Leger, P., & Tremblay, R. In volume 2014-January, pages 1239 - 1246, Porto, Portugal, 2014. Canadian highway bridge design codes;Multiple support excitations;Nonlinear time history analysis;One dimensional wave propagation;Seismic safety assessments;Site response;Wave passages;Winkler foundations;
abstract   bibtex   
The seismic response of an existing 300m long four-span highway bridge supported in the center pier on pile foundation in 30 m of soft soil and on two adjacent piers on rock foundation is investigated. The bridge is located in Eastern Canada where high frequency ground motions (10Hz) are predominant. The following support conditions are considered in comparative analyses: fixed-base (as a reference) and piles with non-linear Soil Structure Interaction (SSI). The structure is analyzed in the longitudinal direction, in which the translational movements between the superstructure supports are constrained to those at the top of the piers and free at the abutments. Linear and nonlinear time-history analyses are performed to evaluate the displacement demand and related internal forces. Simulated ground motion records are calibrated to match the response spectrum of the upcoming Canadian Highway Bridge Design Code (2015). Convolution is used to account for the local effect of the soil layer at the central support and displacement histories are used to account for multiple support excitations. A one-dimensional wave propagation method is used to compute the soil response. The non-linear bridge model includes for the central support piles modeled as a Beam on Non-linear Winkler Foundation with p-y soil curves for the springs along their length. Results show an influence of site-response (or local soil conditions), as it affects internal forces of each column individually. The wave passage effect, with an underlying rock speed of 1500 m/s, has irrelevant influence on the results. Deck displacements have little variations between the different cases considered.
@inproceedings{20164603014336 ,
language = {English},
copyright = {Compilation and indexing terms, Copyright 2023 Elsevier Inc.},
copyright = {Compendex},
title = {Seismic safety assessment of pile supported long span highway bridges: Non homogeneous soil conditions and multiple support excitations},
journal = {Proceedings of the International Conference on Structural Dynamic , EURODYN},
author = {Jaworski, J. and Leger, P. and Tremblay, R.},
volume = {2014-January},
year = {2014},
pages = {1239 - 1246},
issn = {23119020},
address = {Porto, Portugal},
abstract = {The seismic response of an existing 300m long four-span highway bridge supported in the center pier on pile foundation in 30 m of soft soil and on two adjacent piers on rock foundation is investigated. The bridge is located in Eastern Canada where high frequency ground motions (10Hz) are predominant. The following support conditions are considered in comparative analyses: fixed-base (as a reference) and piles with non-linear Soil Structure Interaction (SSI). The structure is analyzed in the longitudinal direction, in which the translational movements between the superstructure supports are constrained to those at the top of the piers and free at the abutments. Linear and nonlinear time-history analyses are performed to evaluate the displacement demand and related internal forces. Simulated ground motion records are calibrated to match the response spectrum of the upcoming Canadian Highway Bridge Design Code (2015). Convolution is used to account for the local effect of the soil layer at the central support and displacement histories are used to account for multiple support excitations. A one-dimensional wave propagation method is used to compute the soil response. The non-linear bridge model includes for the central support piles modeled as a Beam on Non-linear Winkler Foundation with p-y soil curves for the springs along their length. Results show an influence of site-response (or local soil conditions), as it affects internal forces of each column individually. The wave passage effect, with an underlying rock speed of 1500 m/s, has irrelevant influence on the results. Deck displacements have little variations between the different cases considered.<br/>},
key = {Piles},
keywords = {Highway planning;Piers;Soils;Pile foundations;Seismic design;Soil structure interactions;Highway bridges;Wave propagation;},
note = {Canadian highway bridge design codes;Multiple support excitations;Nonlinear time history analysis;One dimensional wave propagation;Seismic safety assessments;Site response;Wave passages;Winkler foundations;},
}

Downloads: 0