【摘要】 以一座大跨3塔悬索桥为工程背景,采用时程分析法分析了行波效应对大跨多塔悬索桥地震反应的影响,比较了行波作用下不同结构体系地震反应的变化规律.研究结果表明:行波效应可能会使边塔的地震反应有较大增长,但对中塔的地震反应影响不大;行波效应对边、中塔基础及梁端位移的反应影响不大;结构体系的变化对行波效应有一定影响,当中塔由沉井基础变为桩基础时,行波效应对边塔的地震反应影响增大;而当中塔与主梁之间设置弹性索,中塔由桩基础变为沉井基础时,行波效应对中塔的地震反应影响增大.更多还原

【Abstract】 Based on a realistic engineering project of a long-span multi-tower suspension bridge,the seismic response under seismic wave passage is analyzed.And the effect of different longitudinal connections between the middle-tower and the girder,and distinct foundations of the middle-tower on seismic wave passage effect was studied.The results indicate that seismic wave passage can amplify the seismic demand of side-towers,but has minor effects on seismic demand of middle-tower.It also has minor effects on seismic demand of foundations and the displacement of main grider.The effect of seismic wave passage on seismic demand of side-towers increments as the piles foundation of middle-tower substitute for caisson.But the effect of seismic wave passage on seismic demand of middle-towers increases as the caisson foundation of middle-tower substitute for foundation with longitudinal elasticity spring between the main-tower and the main girder.更多还原