跨断层桥梁结构地震响应影响

doi:10.13229/j.cnki.jdxbgxb20171090

Abstract

Abstract:

This paper presents a study on seismic response, which influences the Bridge Crossing Active Fault (BCAF). One bridge crossing strike-slip active fault is taken as an example. The seismic ground motions at the site of the bridge are generated following a hybrid simulation methodology. Multi-support excitation displacement input models and time history analysis method are used to calculate seismic response of the structures. The fault crossing position, crossing angle, arrangement of the pier are taken as the key parameters, and their influences on the seismic response are discussed. The results show that the fault crossing position, crossing angle, arrangement of the pier are important parameters influencing the seismic responses of the bridge, which shoul be taken into consideration in the design. With the change of the fault position from the mid-span to side-span of bridge, the most disadvantageous seismic response shows a trend of increase, being unfavorable to stress of the structure. When the fault perpendicularly crosses the bridge the seismic response caused by fault dislocation is minimal, and the optimal rationality and economy for piers internal force are presented. Generally, the demand of maximum transversal bending moment of BCAF does not necessarily occur at the highest pier, but on higher bent on the side of the fault with two bents. The structural response characteristics of the BCAF and the near fault bridge have significant influence, therefore should be paid particular attention in seismic design. The results in this research can be used as a reference to the seismic design and bridge location.

Key words: bridge engineering, influence of seismic response, multi-support excitations, bridges crossing active fault

CLC Number:

U448

HUI Ying-xin,MAO Ming-jie,LIU Hai-feng,ZHANG Shang-rong. Influence of structural seismic response of bridges crossing active fault[J].Journal of Jilin University(Engineering and Technology Edition), 2018, 48(6): 1725-1734.

Figures/Tables 15

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Influence of structural seismic response of bridges crossing active fault

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