地震作用下高墩桥梁横向碰撞效应研究  

Study of Transverse Pounding Effect of High-Rise Pier Rigid-Frame Bridges Under Action of Earthquake

作　　者：邓育林[1] 雷凡[1] 何雄君[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《桥梁建设》2014年第3期25-31,共7页Bridge Construction

基　　金：国家自然科学基金资助项目(51378406);中央高校基本科研业务费专项资金资助项目(WUT:2014-IV-110)~~

摘　　要：为提升高墩大跨连续刚构桥的防震减灾能力,对其合理的减震措施进行研究。以我国西部山区强地震带一座高墩大跨桥梁为例,利用SAP2000Nonlinear有限元程序建立桥梁结构空间非线性计算模型,分析其横向地震响应规律及其碰撞效应。分析结果表明:对于高墩大跨连续刚构桥,在过渡墩墩顶设置弹性挡块时,很难实现对过渡墩与刚构墩地震响应的有效控制,且碰撞产生的撞击力极易使弹性挡块破坏,从而失去限位功能;在过渡墩墩顶设置弹塑性挡块,并选取适当的挡块屈服强度,可有效地控制过渡墩、刚构墩地震响应以及上部结构位移。To enhance the ability of long span and high-rise pier continuous rigid-frame bridges for protecting against earthquake and mitigating the earthquake disaster, the proper seismic mitigation measures for the bridges were studied. By way of example of a bridge of the same kind located in the strong earthquake belt in the mountainous region in the west of China, the finite el- ement program SAP2000 Nonlinear was used to establish the spatial nonlinear dynamic calculation model for the bridge, the transverse seismic response law and the transverse pounding effect of the bridge were analyzed. The results of the analysis reveal that for the long span and high-rise pier continuous rigid-frame bridges, it will be difficult to achieve the effective control of the seismic responses of the transition piers and rigid-frame piers just by arranging the elastic retainers on tops of the transition piers, the forces produced by the pounding can very easily destroy the retainers and hence cause the retainers to lose their functions of restraining. On tops of the transition piers, if the elastic-plastic retainers are provided and the proper yield strength of the retainers is chosen, the seismic responses of the transition piers and rigid-frame piers and the displacement of the superstructure can be effectively controlled.

关 键 词：连续刚构桥 高桥墩 横向刚度 地震响应 横向碰撞效应 挡块 有限元法 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]