行波效应对大跨刚构连续桥梁半主动控制影响分析

ANALYSIS ON INFLUENCE OF SEISMIC TRAVELLING WAVE EFFECT ON SEMI-ACTIVE CONTROL FOR LONG-SPAN RIGID-CONTINUOUS BRIDGE

给出了地震动行波输入下大跨刚构连续桥梁的半主动控制分析方法,在桥梁支座部位设置磁流变阻尼器,对一座五跨刚构连续桥梁进行了不同视波速行波输入下的半主动控制计算分析.结果表明,行波效应对该大跨刚构连续桥梁的无控制地震反应、半主动控制地震反应和减震效果均有显著影响,对主梁和桥墩均会在较低视波速地震行波输入时表现出不利影响,并且使半主动控制减震效果明显降低.因此,在确定半主动控制系统的参数时应考虑地震行波效应的影响以确保控震效果.

The analysis approach of semi-active control for long-span rigid-continuous bridge under seismic travelling wave input is established. Magnetorheological dampers are set on the positions of the bridge bearings. The semi-active control calculation and analysis are performed for a five-span rigid-continuous bridge under seismic travelling waves with different apparent surface velocities. The results indicate that travelling wave effect remarkably influences the uncontrol seismic responses, the semi-active control seismic responses and vibration control effects for the long-span rigid-continuous bridge. It is disadvantageous to the responses of the beams and the piers under the travelling wave input with lower apparent surface velocity, and travelling wave effect can decrease the vibration control effects evidently. Therefore, the travelling wave effect should be considered for the selection of the parameter values of semi-active control system in order to get the designing control effect.