地震作用下高墩刚构桥倒塌分析  

Collapse Analysis of Rigid-Frame Bridge with High-Rise Piers Under Earthquakes

作　　者：张行[1] 张谢东[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《世界桥梁》2014年第1期31-35,共5页World Bridges

基　　金：内蒙古自治区交通科技项目(NJ-2012-18)

摘　　要：为了研究高墩刚构桥在地震作用下的倒塌问题,根据结构在地震作用下发生损伤累积而丧失承受竖向荷载的能力、最终发生倒塌破坏的机理,提出了基于墩顶竖向位移的倒塌判别准则;采用基于单地震动记录IDA的分析方法,得到了结构倒塌破坏的极限状态点和塑性变形特征。以一座最大墩高为178m的(100+3×200+106)m高墩刚构桥为背景,进行结构倒塌分析,并对其结构塑性变形特征进行研究。结果表明:高墩刚构桥墩顶竖向位移可作为倒塌破坏的特征响应;墩底、墩顶和系梁附近是结构塑性发展区。In order to study the collapse problem of rigid-frame bridges with high-rise piers, the collapse identification principle based on the vertical displacement on top of piers was proposed by taking into consideration of the collapse damage mechanism that a bridge structure is likely to lose its bearing capacity for vertical loads due to damage accumulation under the action of earth- quakes and eventually collapses. The incremental dynamic analysis （IDA） based on the data of an individual earthquake was adopted to obtain the limit state point of the structural collapse damage and the plastic deformation feature. A rigid-frame bridge with span arrangement of （106 ＋3 X 200 -/-106） m and with a highest pier of 178 m was taken as the study background. The structural col- lapse of the bridge was analyzed and the structural plastic deformation feature of the bridge was studied. The results demonstrated that the vertical displacement on pier top of the rigid-frame bridge with high-rise piers could be used as an eigen response of collapse damage, and the structur- al plastic propagation zone is in the vicinity of the bottom of the pier, the pier top and tie beam.

关 键 词：刚构桥 高桥墩 地震 位移 IDA 竖向位移 塑性变形 分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]