山区大跨悬索桥考虑空间变异性的地震响应  

SEISMIC RESPONSE OF MONTANIC LONG-SPAN SUSPENSION BRIDGE CONSIDERING SPATICAL VARIATION

作　　者：龙晓鸿[1,2] 陈恩友[1,2] 李黎[1,2] 

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

出　　处：《工程力学》2009年第A01期130-133,共4页Engineering Mechanics

基　　金：国家自然科学基金项目(50878093);交通部西部交通建设科研项目(200431800024)

摘　　要：以一座在建的山区大跨悬索桥为研究对象,采用基于规范设计反应谱迭代拟合法合成一致激励、行波效应以及多点激励三种工况下的位移时程,并作为该桥地震动输入。采用两水准设防抗震设计方法,分别按纵向+竖向、横向+竖向对其进行线性和几何非线性地震时程分析,计算了主塔弯矩和剪力响应。分析结果表明:沿纵桥向,多点激励的影响较大;沿横桥向,三种工况结果相差较小,且线性与几何非线性分析结果较接近。The montanic long-span suspension bridge abuilding is taken as an example, the iterative fitting method which is compatible with design response spectrum is adopted to respectively simulate the uniform excitation, wave passage effect and multi-point excitation, which are in turn used as the earthquake ground motions input for the suspension bridge. According to two-phase aseismic fortification criterion, linear and nonlinear seismic time-history analyses are carded out under two kinds of combinations of earthquake ground motion inputs, i.e., the longitudinal ＆ vertical directions and the lateral ＆ vertical directions, the peak bending moment and shearing force distributions of the main tower are calculated. The analysis shows that the multi-support excitation effect affects greatly in the longitudinal bridge direction while the result of three cases is almost the same in the lateral bridge direction, and calculation results of the linear and nonlinear analyses are very close.

关 键 词：大跨悬索桥 几何非线性 空间变异性 人工地震动 地震响应 

分 类 号：TU311.3[建筑科学—结构工程] U448.25[建筑科学—桥梁与隧道工程]