简支梁人行天桥三维地震响应分析  

Analyses of Three-dimensional Seismic Response and Impact Parameters of Pedestrian Bridge Considering Pounding Effects

作　　者：张文学[1] 刘海陆[1] 寇文琦 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《工程抗震与加固改造》2015年第6期93-101,35,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金面上项目(51378034/E080505);北京市自然科学基金面上项目(8122007)

摘　　要：研究表明,采用板式橡胶支座的中小跨径桥梁抗震性能较差。为了探究采用板式橡胶支座的简支梁人行天桥的地震响应特性,以某典型混凝土简支梁人行天桥为研究对象,采用SAP2000建立有限元动力分析模型,进行非线性时程分析,研究了竖向地震动对简支梁人行天桥地震响应的影响,探讨了采用板式橡胶支座的简支梁人行天桥在地震中存在的问题。结果表明:采用板式橡胶支座的简支梁人行天桥抗震性能较差,在罕遇地震中极易发生过大的梁墩相对位移而导致落梁;桥墩地震响应较小,抗侧能力发挥有限;竖向地震动对采用板式橡胶支座的简支梁人行天桥产生不利影响,必须进行三维地震响应分析才能较准确地反映其地震响应情况。Studies have shown that plate rubber bearing bridges of small and medium span have poor seismic performance. In order to explore seismic response characteristics of plate rubber bearing simply supported girder pedestrian bridge,taking a typical concrete pedestrian bridge as the research object,finite element dynamic analysis model is established by SAP2000,with nonlinear time history analysis method,effects of vertical seismic and other factors on the seismic responses of the pedestrian bridge are researched and seismic problems of the same bridges are revealed. The results show that plate rubber bearing simply supported girder pedestrian bridge have poor seismic performance and it is easy leading to beam falling caused by large relative displacement during an severe earthquake.The response of piers is small and their lateral resist ability are not full played. Vertical earthquake exerts an adverse effect on the seismic performance of pedestrian bridge and three-dimensional seismic response analysis must be conducted to accurately reflect its seismic response.

关 键 词：简支梁人行天桥 三维地震响应 板式橡胶支座 竖向地震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]