多点地震输入桥梁结构设置叠层橡胶隔震支座效果研究  

Research about LRB Seismic Isolating System on Bridges With Multiply Point Input of Earthquake Waves

作　　者：葛楠[1] 李凤鑫[1] 王芳[1] 张磊[1] 

机构地区：[1]河北联合大学河北省地震工程研究中心,河北唐山063009

出　　处：《工程抗震与加固改造》2014年第4期73-80,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51378170);河北省科技支撑项目(11215120D)

摘　　要：根据拉格朗日方程推求了多点地震动输入时多跨简支梁桥采用叠层橡胶隔震支座后的地震动力反应计算公式,并编制了数值求解软件。分析与计算结果表明,设置橡胶隔震支座以后,桥墩的剪力大幅减少。在多点输入的条件下,隔震支座的作用更为重要,0时差时隔震效率达48.9%,当时差为0.1s时隔震效率达55.9%。当降低橡胶支座的等效刚度及等效阻尼系数时,隔震效率提高,但这时墩-梁之间的相对位移值增加。A numerical model is established for a beam bridge simply supported with LRB bearings with multiply point input of earthquake waves. It started from Lagrange equation in dynamic mechanics. The software for its numerical solution is presented. The results show that pier shear force could be significantly reduced with LRB bearing. In case of multiply point input for earthquake waves, LRB bearing presents its inplaceble prevention for bridge structure. The isolation efficiency could rearch 48.9% at 0s time-delay and 55.9% at 0. I s time-delay. The seismic isolation efficiency will increase when the equivalent rigidity and damp coefficient decrease, but the maximum displacement between the pier and beam will increase.

关 键 词：多点输入 叠层橡胶隔震支座 时差 拉格朗日方程 NEWMARK-Β法 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]