空间地震动输入下大跨度拱桥减震控制研究  

SEISMIC CONTROL OF LONG-SPAN ARCH BRIDGE UNDER SPATIALLY VARIABLE SEISMIC EXCITATION

作　　者：李正英[1] 李正良[1] 

机构地区：[1]重庆大学土木工程学院,重庆400030

出　　处：《振动与冲击》2008年第7期83-86,90,共5页Journal of Vibration and Shock

摘　　要：对拱桥这种大型结构在地震激励作用下实施减震控制是提高结构安全性的重要途径。本文提出在大跨度中承式拱桥上设置粘滞阻尼器的减震控制方案。考虑粘滞阻尼器的非线性粘滞阻尼特性,采用对状态方程直接积分的方法对设有阻尼器减震装置的拱桥结构进行非线性被动减震控制分析。以重庆菜园坝大桥作为模型原型,建立拱桥三维有限元模型,对比分析了该桥在一致输入、行波输入的减震效果。分析结果表明,设置阻尼器后,纵向一致激励、行波输入下位移反应都有较好的减震效果;但行波输入下拱桥内力减震效果优于一致输入下的减震效果。The paper presents a scheme of passive control of seismic responses of long-span half-through arch bridges. Nonlinear dynamic analysis through state variables equation integration is employed to examine the seismic behavior of arch bridge with the supplemental nonlinear viscous dampers. Taking CaiYuanBa arch bridge in Chongqing as original model, the paper analyzes the effectiveness of seismic control of the bridge by support consistent and multi-support seismic excitation . The numerical results indicate that displacements are reduced effectively in both cases of seismic excitation input ,but internal force reduction in the case of multi-support excitation input is superior to that of support consistent excitation input.

关 键 词：大跨度拱桥 被动减震 控制 粘滞阻尼器 

分 类 号：TU352.1[建筑科学—结构工程] U448.22[建筑科学—桥梁与隧道工程]