Finite Element Analysis of Bridge-Foundation Interaction System under Horizontal Seismic Excitation

Abstract:

Based on Newmark-β gradual integration method and elastic-plastic mechanical theory, numeriacl analyses of effects of soft soil depth and thickness and pile length on the characteristics of horizontal seismic response of bridge-foundation interaction system with soft layers conducted by using finite element program Midas/GTS. The numerical results show that: (1) The high frequency components of seismic excitations can be filtered and the low frequency components are amplified correspondingly when seismic waves are transmitted through soft soil layer, and thicker and lower soft soil layer can amplified this effects; (2)The extremum force of abutment shows decreases first then increases with depth decreasing, and displacement of abutment top and bottom has the same law with seismic waves, and the thicker and lower soft soil layer or shorter piles can aggravate abutment force and deformation; (3)Shear extremal stress shows decrease from top to bottom and the thicker and lower soft soil layer or shorter piles are adverse on piles; (4)Moment extremal expresses first increase then decrease with pile length and the lower and thicker soft soil layer or shorter piles can enlarged piles moment.

• Periodical: Applied Mechanics and Materials (Volumes 490-491)
• Pages: 691-694
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.490-491.691
• Online since: January 2014
• Authors: Shou Long Chen, Chun Yi Cui, Yan Sun
• Keywords: Interaction System, Numerical Analysis, Seismic Excitation, Soft Soil

References

[1] Chistian L, Jonathan D B. Probabilistic Performance Based Procedure to Evaluate Pile Foundations at Sites with Liquefaction Induced Lateral Displacement[J]. Geotechnical and Geoenviromental engineering, 2010, 136(3): 464-476.

DOI: 10.1061/(asce)gt.1943-5606.0000226

[2] Sevasti D T, Stergios A M, Ioannis A T. An unconventional earthquake resistant abutment with transversely directed R/C walls[J]. Engineering Structures, 2010, 32: 3801-3816.

DOI: 10.1016/j.engstruct.2010.08.024

[3] A J Kappos, G D Manolis, I F Moschonas. Seismic assessment and design of R/C bridges with irregular congiguration including SSI effects[J]. Engineering Structures, 2002, 24: 1337-1348.

DOI: 10.1016/s0141-0296(02)00068-8

[4] Huang Yu, Ba Yuhou, Zhang Feng. Finite element analysis of pile-soil-structure dynamic interaction in liquefiable site[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(6): 646-651.

[5] Ling Xianchang, Wang Chen, Wang Zhiqiang, Wang Dongsheng, Wang Cheng. Study on large-scale shaking table proportional model test for free-ground liquefaction arisen from earthquake[J]. Earthquake Engineering and Engineering Vibration, 2003, 23(6): 138-143.