【作者】 龙晓鸿； 陈蓓蕾； 李俊； 樊剑； 杨斌斌；

【Author】 LONG Xiao-hong;CHEN Beilei;LI Jun;Fan Jian;YANG Bin-bin;School of Civil Engineering & Mechanics,HUST;Hubei Key Laboratory of Control Structure,HUST;Central-South Architectural Design Institute Co. Ltd;CCDI GROUP;

【机构】 华中科技大学土木工程与力学学院； 华中科技大学控制结构湖北省重点实验室； 中南建筑设计院股份有限公司； 悉地国际设计顾问(深圳)有限公司；

【摘要】 隔震支座的力学性能对隔震桥梁的破坏概率有重要的影响,有效地应用隔震支座对梁桥结构减隔震设计一直是学术界研究的一个热点问题。本研究以某钢筋混凝土LRB隔震连续梁桥(公路桥梁)为研究对象,采用有限元分析软件Opensees建立桥梁模型,采用概率地震需求分析(PSDA)和增量动力分析(IDA)方法分别计算桥梁模型地震易损性并对比,通过桥墩和隔震支座各个构件的破坏准则建立起整个隔震连续梁桥的极限破坏状态。最后建立支座参数、桥墩特性和地震强度三者关系方程,变换支座参数用IDA法计算出不同极限状态下结构地震易损性曲面,最优的LRB隔震支座参数组合:支座屈前刚度为5倍桥墩屈前刚度,支座屈服剪力为0.6倍桥墩屈服剪力。更多还原

【Abstract】 The mechanical properties of the isolation devices have a significant effect on the damage probability of the isolated bridges. It’s a significant problem to design the isolation devices parameters of the highway bridges effectively in the area of seismic mitigation and absorption. In this paper a RC seismic isolation continuous highway bridge was selected, and built the bridge model with the Opensees software. Both Probabilistic Seismic Demand Analysis(PSDA) and Incremental Dynamic Analysis(IDA) methods are used and compared in generating the seismic fragility functions. Damage criteria for both piers and isolation devices are established to relate the component response quantities to global damage states of bridges. In order to obtain the optimum design parameters of the isolation devices a function of isolation device parameters, properties of piers and earthquake intensity were established, then solved the function of different damage states under various isolation parameters using IDA method. The optimum combinations of isolation parameters were that the isolation device’s elastic stiffness of is 5 times of pier’s elastic stiffness and the isolation device’s yielding strength is 0.6 times of pier’s yielding strength.更多还原