非规则大跨刚构-连续组合桥地震易损性分析

发布时间：2018-01-06 06:16

本文关键词：非规则大跨刚构-连续组合桥地震易损性分析　出处：《防灾减灾工程学报》2017年02期 　论文类型：期刊论文

【摘要】：以某西部山区薄壁大跨刚构-连续组合桥梁为研究对象,分析了非规则大跨刚构-连续组合桥梁纵、横向地震易损性。基于OpenSees平台,建立了其非线性纤维有限元模型。采用曲率作为墩柱损伤指标,位移作为活动盆式支座损伤指标,基于IDA方法分析了该桥在不同地震动下的动态响应,得到桥墩纵、横向地震动作用下的曲率包络图,分析了不同桥墩构造的破坏情况,建立了墩柱以及支座的易损性曲线,讨论了不同墩高对桥墩地震易损性的影响。结果表明:桥墩的纵向地震损伤概率大于横向损伤概率,且墩高越高损伤概率越小;支座横向地震损伤概率大于纵向损伤概率。其研究结果可为非规则刚构-连续组合桥梁的抗震设计提供参考和依据。
[Abstract]:In a western mountainous area of large span thin-walled rigid continuous composite bridge as the research object, analyzes the rigid continuous composite bridge beam longitudinal irregular large span, horizontal seismic vulnerability. Based on the platform of OpenSees, a nonlinear finite element model. Using fiber curvature as the index of damage the pier displacement as sliding pot bearing the damage index, based on the IDA method to analyze the dynamic response of the bridge under different earthquake under the pier longitudinal, lateral curvature envelope diagram of seismic damage analysis, different pier structure, the establishment of pier and bearing the vulnerability of the curve, the influence of different height of pier to pier seismic vulnerability discussion. The results show that the longitudinal seismic damage probability of the pier is greater than the transverse damage probability and damage probability, the higher the pier is smaller; bearing transverse seismic damage probability is greater than the longitudinal damage probability. The results can be used for non compliance It provides reference and basis for the seismic design of rigid frame continuous composite bridges.

【作者单位】：西南交通大学土木工程学院;
【基金】：国家重点基础研究发展计划(973计划)(2013CB036302) 四川省科技计划项目(2011JY0032)资助
【分类号】：U442.55
【正文快照】： 引言我国西部地区多为山岭重丘区,地形、地貌和地质条件复杂,桥梁结构在该地区线路中往往占有很大比例。西部地区桥梁结构调查表明:墩高超过40m的高墩桥梁占桥梁总数的40%以上,且墩高相差悬殊,属于典型的非规则桥梁[1]。我国现行的《公路桥梁抗震设计细则》[2]扩大了适用范围,

【相似文献】