摘要
为了解跨断层桥梁地震响应规律,为桥梁抗震设计与研究提供参考,以一座跨越走滑断层梁桥为研究对象,利用混合模拟法合成了跨断层桥梁地面运动时程,基于地震动位移输入模型,采用非线性时程分析法计算了该桥的结构地震响应,并从内力和位移响应方面与对应近断层桥梁进行了对比分析。结果表明:跨断层梁桥的桥墩承受较大扭矩;在断层错动方向,断层两侧主梁、支座及桥墩的内力、位移响应方向相反,地震动结束后,存在显著的残余内力和位移,具有较大的结构破坏风险。建议设计时应基于跨断层桥梁的地震响应特性,进行针对性的抗震设防,以减轻或避免结构破坏带来的不利影响。
To understand the seismic response laws of the bridges crossing faults and to pro‐vide references for the seismic design and researches of the bridges ,a bridge crossing the strike‐slip fault was taken as the case study ,the time history of ground motion of the bridge was generated by the hybrid simulation method .Based on the ground motion displacement input model ,the struc‐tural seismic responses of the bridge were calculated by the nonlinear time‐history analysis method and the calculation results were analyzed and compared to the corresponding bridges crossing faults in the aspects of the internal force and displacement responses .The results of the analysis show that the piers of the bridges crossing faults are subjected to great torsional moment and in the stag‐gering directions of the faults ,the directions of the internal force and displacement responses of the main girders ,bearings and piers on both sides of the faults are opposite .After the ground motion terminates ,the significant residual internal forces and displacement exist ,w hich can bring about great risk of damage to the structures .It is therefore proposed that the targeted seismic fortifica‐tion should be formulated in the design according to the seismic response features of the bridges so as to lessen or avoid the adverse influences caused by the damage of the structures .
出处
《桥梁建设》
EI
CSCD
北大核心
2015年第3期70-75,共6页
Bridge Construction
基金
科技部国际科技合作项目(2009DFA82480)
交通运输部西部交通建设科技项目(2009318223094)
交通运输部公路工程行业标准项目(JTG-C-201012)~~
关键词
简支梁桥
跨断层
破裂方向性效应
滑冲效应
有限元法
地震响应
simply-supported beam bridge
crossing fault
rupture directivity effect
strike-slip effect
finite element method
seismic response
