【摘要】 结合泰州长江公路大桥的工程设计实例,研究了该桥的动力特性及地震反应的特点。采用反应谱和时程分析法对该桥进行了线性地震反应分析,探讨了大跨度三塔悬索桥地震反应的特点。分析了竖向地震动、中塔与主梁之间的纵向弹性索和高阶振型对该桥抗震性能的影响。结果表明:竖向地震动对主梁弯矩和边塔的动轴力贡献较大;在中塔与主梁之间采用弹性索对中塔内力反应影响不大,但可以明显减小了边塔弯矩、主梁梁端位移以及主梁与次边跨间相对位移,对结构抗震有利;高阶振型对主塔的地震反应影响很大,主塔的地震反应主要由高阶振型引起的。更多还原

【Abstract】 Based on an engineering design case of a long-span triple-tower suspension bridge, the linear seismic response analysis is performed by using response spectrum and time history analysis method, respectively. The dynamic characteristic of seismic response of the bridge is discussed and the effect of vertical earthquake , longitudinal elastic cable between middle tower and girder and higher frequency models on the seismic response is studied. The results indicate that vertical earthquakes have significant influence on moment of girder and dynamic axis force of side-towers. the link between middle-tower and girder can reduce seismic response of side-towers, the displacement of girder and the relative displacement between main-span and side-span obviously. Higher frequency modes of vibration have significant influence on seismic response of towers.更多还原