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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。
Taking a large-span suspension bridge in mountain area under construction as the research object, the displacement time-history under three conditions of consistent excitation, traveling wave effect and multi-point excitation based on the standard design response spectrum iterative fitting method is adopted and used as the ground input of the bridge . A two - level fortification and aseismic design method is adopted. The linear and geometric nonlinear time history analysis of the tower is carried out according to the vertical direction, the vertical direction and the horizontal direction. The moment and shear response of the main tower are calculated. The analysis results show that the influence of multi-point excitation along the longitudinal bridge is larger, and the difference between the three conditions along the transverse bridge is smaller, and the linear and geometric nonlinear analysis results are close.