基于增量动力分析方法的非对称独塔斜拉桥H形桥塔抗震性能评估  

Assessment on Seismic Performance of H-shaped Pylon Based on IDA for Cable-stayed Bridge with Asymmetric Single Pylon

作　　者：王力[1,2] 李子奇[1,2] 冯莉[1] 郝勇[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学道桥灾害防治技术国家地方联合实验室,甘肃兰州730070

出　　处：《铁道建筑》2017年第8期4-6,14,共4页Railway Engineering

基　　金：长江学者和创新团队发展计划(IRT15R29)

摘　　要：为研究空间异形斜拉桥桥塔在地震作用下的破坏过程和抗震性能,本文以天水市藉河非对称独塔斜拉桥为工程背景,采用增量动力分析方法(IDA,Incremental Dynamic Analysis)对该斜拉桥进行有限元动力弹塑性分析,得到了在顺桥向、横桥向地震作用下桥塔潜在的塑性铰区域和关键部位的IDA曲线。结果表明:由于桥塔采用保守的弹性设计,在罕遇地震作用下桥塔处于弹性状态;在极罕遇地震作用下桥塔虽不能完全保持弹性,但屈服后仍具有一定的安全储备,抗震性能较好。In order to study the damage process and seismic performance of a cable- stayed bridge w ith irregularpylon under earthquake action, a cable- stayed bridge w ith asymmetric single pylon on Ji River in T ianshui C ity w astook as the engineering background. T he dynamic elastoplastic analysis of the cable- stayed bridge w as carried out byincremental dynamic analysis（ IDA） method. T he IDA curves of the potential plastic hinge region and the key partsof the pylon w ere obtained under the actions of the longitudinal and transverse earthquake. T he results show that dueto the use of conservative elastic design, the pylon can be fully guaranteed in elastic state under the action of rareearthquake. T he pylon can＇t maintain completely elastic state under the action of extremely rare earthquake, but itstill has a certain safety reserve after yielding. T he pylon has good seismic performance.

关 键 词：城市桥梁 抗震性能 增量动力分析 H形桥塔 残余位移 IDA曲线 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] TU352.1[交通运输工程—道路与铁道工程]