桩-土-桥相互作用对隔震连续梁桥地震响应的影响  

Influences of Soil-Pile-Structure Interaction on Seismic Response of Continuous Bridge

作　　者：李黎[1,2] 陈元坤[1,2] 杨金虎 叶志雄 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点实验室,湖北武汉430074 [3]湖北省电力勘测设计院,湖北武汉430024 [4]武汉市建筑设计院,湖北武汉430014

出　　处：《工程抗震与加固改造》2010年第1期50-56,49,共8页Earthquake Resistant Engineering and Retrofitting

摘　　要：随着隔震技术在桥梁结构中的广泛应用,建立合理的桥梁模型进行隔震分析十分重要。以某连续钢箱梁桥为对象,建立了墩底固结不考虑桩土、M法桩和非线性有限元桩的三种桥梁模型,通过对这三种桥梁模型进行隔震前后的地震响应分析,以研究桩-土-结构相互作用对不隔震和隔震桥梁的影响。研究表明:考虑桩-土相互作用对该桥梁隔震前、后的地震响应都具有较大的放大效应,非线性有限元桩桥梁模型的放大效应大于M法桩的桥梁模型;三种模型的隔震率相差不大,不考虑桩-土-桥梁结构相互作用不会对隔震率产生过大估计。With the seismic isolation technology is widely used in bridge structure, reasonable bridge model is very important for seismic isolation analysis. Taking one continuous steel box girder bridge as research object, three kinds of finite element models of that bridge are established： first one, all piers bottom fixed without consider pile and soil; second one, with M method pile; third one, use nonlinear finite element model of pile-soil. Then time history analysis of the three models before and after seismic isolation when subjected to E1-Centro wave at the longitudinal and lateral side of the bridge are made respectively, seismic responses are compared and analyzed to find out the effects of soil-pile-bridge structure dynamic interaction. Finally, it is indicated that considering the dynamic interaction of soil-pile-bridge structure can amplify the seismic responses of this continuous bridge, and amplification effect of the third model is greater than the second one. But the interaction has little influence on ratio of isolation, so without consider the interaction of soil-pile-bridge will not lead to too large estimation of the isolation efficiency.

关 键 词：连续梁桥 桩-土-桥相互作用 隔震 铅芯橡胶支座 时程分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]