【作者】 杨风利； 钟铁毅； 夏禾；

【Author】 Yang Fengli, Zhong Tieyi, XIA He(School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044)

【机构】 北京交通大学土木建筑工程学院；

【摘要】 本文以典型的铁路简支梁桥为研究对象,采用铅芯橡胶支座对铁路简支梁桥进行了减隔震计算研究,通过建立梁-铅芯橡胶支座-墩-基础的动力相互作用模型,应用通用有限元程序SAP2000对地震激励下的桥梁结构系统进行非线性时程分析,研究了铅芯橡胶支座动力参数、基础刚度、基础刚度与支座刚度比对桥梁结构地震响应的影响,为铁路简支梁桥的减隔震设计提供了有益参考。研究结果表明,采用铅芯橡胶支座,可以增大桥梁结构体系的固有周期,有效降低桥墩结构的地震力,同时使梁体位移有所增加;考虑基础-结构的相互作用对未隔震桥梁地震响应的影响远比对隔震桥梁地震响应的影响大;当基础刚度与隔震支座等效刚度之比小于某一数值时,必须考虑基础与结构的相互作用。更多还原

【Abstract】 In this paper, the dynamic interaction model of beam - lead core bearing - pier - foundation for the typical railway simple supported beam bridge is established. The lead core bearing is used for calculation study on the seismic isolation and reduction of the railway simple supported beam bridge, and the nonlinear time - history analysis is carried out by using general FEA program SAP2000 for the bridge structure system under the excitation of earthquake. Through the calculation analysis, the influences of the parameters including the lead core bearing and foundation stiffness as well as the stiffness ratio between the foundation and the lead core bearing on seismic responses of bridge structure are studied, which provide valuable reference for the seismic isolation design of railway simple supported beam bridge. The study results indicate: (i) by using the lead core bearing, the natural period of bridge structure will be increased and the seismic forces of bridge pier will be reduced effectively, (ii) the effect of the interaction between foundation and structure on the seismic responses of the non - isolated bridge is more significant than that of isolated bridge, (iii) the interaction between foundation and structure should be considered when the stiffness ratio between the foundation and the lead core bearing is lower than certain value.更多还原