大跨斜拉桥减震控制分析

研究目的：对设置阻尼器的斜拉桥进行地震反应数值模拟，为半主动控制和被动控制在大跨斜拉桥减震中的应用提供理论指导。研究方法：以一座大跨斜拉桥为实例，通过建立其有限元模型计算分析主动控制、半主动控制和被动控制对飘浮体系斜拉桥的减震效果，并分析地震行波效应对斜拉桥地震反应的影响。研究结论：半主动控制和被动控制对该斜拉桥的大部分地震反应均能取得良好的控制效果，但是使得桥梁塔底剪力等部分地震反应增大；不同频谱成分的地震动输入显著影响斜拉桥的地震反应和控制方法的减震效果；行波效应对斜拉桥主梁具有不利影响，但对桥塔抗震有利，并且对3种控制方法减震效果的不利影响很小。

Seismic Response Control Analysis of Long-span Cable-stayed Bridge

Research purposes: Numerical simulation of seismic response is performed for cable-stayed bridge with dampers in order to provide theoretical guidance for the applying of semi-active control and passive control in cable-stayed bridge seismic mitigation.Research methods:For a long-span cable-stayed bridge,the vibration-suppressed effectiveness of active control,semi-active control and passive control for the floating cable-stayed bridge is calculated and analyzed with its finite element model.Influence of seismic traveling wave effect on the seismic responses of cable-stayed bridge is analyzed.Research conclusions:Semi-active control and passive control can get good control efficiency for the most seismic responses of the cable-stayed bridge,but they can make some seismic responses including bottom shearing force of the bridge tower lager.The seismic inputs with different frequency spectrums evidently influence seismic responses of the cable-bridge and vibration-suppressed effectiveness of the control methods.Traveling wave effect can make bad influence on the beam of cable-bridge,but can be propitious to bridge tower.Bad influence of the 3 control methods on vibration-suppressed effectiveness is little.