地震动行波作用下大跨斜拉桥与引桥伸缩缝处碰撞效应研究  

Study of Collision Effect at Expansion Joints between Main span and Approach Spans of Long-span Cable-stayed Bridge due to Travelling Wave Seismic Response

作　　者：雷凡[1] 邓育林[1] 何雄君[1] 

机构地区：[1]武汉理工大学交通学院,武汉市430063

出　　处：《公路》2015年第2期70-75,共6页Highway

摘　　要：以一座典型大跨斜拉桥为研究背景,采用SAP2000Nonlinear有限元程序,考虑地震动行波效应以及主桥-引桥伸缩缝处碰撞效应的影响,建立了桥梁结构三维非线性计算模型,采用非线性动力时程分析法,分析了地震动行波作用下大跨斜拉桥主桥—引桥伸缩缝处碰撞效应对结构地震响应的影响。研究结果表明,地震动行波作用下大跨斜拉桥主桥—引桥伸缩缝处碰撞效应对引桥结构地震响应的影响较大,与一致激励下主桥-引桥碰撞效应相比,不仅会在伸缩缝处激起更大的撞击力,而且会使得两侧引桥梁端位移、主梁-过渡墩相对位移以及固定墩地震响应显著增大,更易导致引桥桥墩破坏或梁体落梁。In this paper, taking a typical long-span cable-stayed bridge as an example, three dimensional nonlinear dynamics model considering the travelling wave effects and pounding effects at expansion joints between main span and approach spans is established by using SAP2000 Nonlinear program. And using the nonlinear time history analysis method, the pounding effects caused by travelling wave effects on seismic performance of the bridge are studied. The study results indicate that the pounding effects caused by travelling wave effects have obvious impact on seismic performance of approach spans, and compared with the pounding effects under uniform excitation, the pounding can easily produce greater pounding force at expansion joints between main span and approach span and amplify significantly the deck displacement of the approach spans, the relative displacement between the approach span＇s deck and transitional pier and the seismic response of the approach spans＇ fixed pier which can causes easily damage of the approach spans＇ fixed pier and unseating of the superstructures.

关 键 词：大跨斜拉桥 行波效应 引桥 地震 碰撞效应 研究 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]