连续梁桥在主震-余震序列波下的地震易损性分析

发布时间：2018-04-11 20:53

本文选题：主震-余震序列波 + 三跨连续梁桥　；参考：《哈尔滨工程大学学报》2016年12期

【摘要】：地震通常以地震序列的形式发生,主震后通常会伴随余震。结构在主震中发生损伤后,即使较低震级的余震仍然会造成很强的结构破坏,并产生严重的后果。为了研究余震对于连续梁桥抗震性能的影响,本文采用易损性方法,以一座三跨连续梁为例,利用Open Sees程序建立三维有限元模型,选取并整合75条实测主震-余震序列波,分别在考虑余震及不考虑余震的情况下,使用云图法建立概率地震需求模型并计算其地震易损性,通过对比分析得到余震对结构地震易损性的影响。分析结果表明:余震会增大桥梁结构的地震需求及地震易损性,并且地震强度越大余震的影响也越大。因此忽视余震的影响往往会高估结构的抗震能力,在进行结构抗震设计时地震动输入应考虑主震-余震序列波。
[Abstract]:Earthquakes usually occur in the form of earthquake sequences, and aftershocks usually follow after the main earthquake.After the structure is damaged in the main shock, even the aftershocks with lower magnitude will still cause very strong structural damage and have serious consequences.In order to study the effect of aftershocks on seismic behavior of continuous beam bridges, a three-span continuous beam is used as an example in this paper. A three-dimensional finite element model is established by using Open Sees program, and 75 measured main shock-aftershock sequence waves are selected and integrated.In the case of considering aftershocks and not considering aftershocks, the probabilistic seismic demand model is established by cloud map method and its seismic vulnerability is calculated. The effects of aftershocks on structural seismic vulnerability are obtained by comparison and analysis.The results show that aftershocks will increase the seismic demand and seismic vulnerability of bridge structures, and the greater the earthquake intensity, the greater the impact of aftershocks.Therefore, ignoring the influence of aftershocks often overestimates the seismic capacity of the structure, and the seismic input of the structure should take into account the main shock and aftershock sequence waves.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：土木工程防灾国家重点实验室基金项目(SLDRCE14-B-14) 国家自然科学基金项目(51478339,51278376,91315301) 江西省科技计划(20151BBG70064)
【分类号】：U442.55

【相似文献】