地震行波输入下大跨度斜拉桥耗能减震措施

地震作用下漂浮体系斜拉桥的纵向位移较大,需采取抗震减震措施。以一座大跨度斜拉桥为实例,建立三维有限元模型,计算分析了地震行波输入下粘滞阻尼器对飘浮体系斜拉桥的减震效果。结果表明,地震行波效应会减小斜拉桥桥塔的地震反应而增大主梁的地震反应,粘滞阻尼器被动控制对斜拉桥位移的减震效果非常显著,且行波效应对其减震效果无明显不利影响。

Energy-dissipated Seismic Mitigation for Long-span Cable-stayed Bridge under Traveling Wave Input

Great longitudinal displacement will occur to the floating cable-stayed bridge under seismic impact and measures must be taken to mitigate it. For a long-span cable-stayed bridge, the vibration-suppressed effect of viscous dampers is calculated and analyzed with its three dimensional finite element model under seismic traveling wave input. The results indicate that seismic traveling wave effect can lower the seismic response of the pylon and increase the seismic response of the girder. The vibration-suppressed effect of passive control with viscous dampers is obvious on the displacement of the cable-stayed bridge. Traveling wave effect makes little unfavorable impact on the vibration-suppressed effect.