跨断层桥梁结构地震响应影响

doi:10.13229/j.cnki.jdxbgxb20171090

摘要/Abstract

摘要：

以一座跨走滑断层连续梁桥为研究对象,利用混合模拟法合成该桥地面运动时程曲线,采用非一致激励时程法对其地震响应进行计算,并以断层穿越位置、穿越角度、墩高布置为分析参数,研究了上述参数对跨断层桥梁地震响应的影响。结果表明:①断层穿越位置、穿越角度、墩高布置方式对跨断层桥梁的地震响应具有显著影响,设计时应对此予以考虑。随着断层位置由桥梁中跨向边跨移动,其最不利地震响应呈增大趋势,结构受力偏向不利;当断层垂直穿过桥梁时,结构地震响应值相对较小,且分布合理性、经济性最优;跨断层桥梁横向最大弯矩需求并不一定发生在最高墩,而通常发生在断层同侧两个桥墩中的较高桥墩。②跨断层效应对桥梁结构的地震响应特征及规律影响显著,应对其进行针对性抗震设计。本文研究成果可为该类桥梁的抗震设计和桥位布置提供参考和依据。

关键词: 桥梁工程, 地震响应规律, 非一致激励, 跨断层桥梁

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

中图分类号:

U448

惠迎新,毛明杰,刘海峰,张尚荣. 跨断层桥梁结构地震响应影响[J]. 吉林大学学报(工学版), 2018, 48(6): 1725-1734.

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.

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