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为了研究行波效应对斜拉桥减震控制地震反应的影响,推导了多点地震动输入下的大跨桥梁减震控制计算方法,以一座大跨飘浮体系斜拉桥为实例,在桥塔和桥墩处设置阻尼器,建立其三维有限元模型,分析了行波输入下半主动控制和被动控制对斜拉桥的减震效果。计算结果表明:半主动控制比较缓和地控制桥梁的地震反应,而被动控制则急剧地控制桥梁的地震反应,因此,要慎用被动控制;行波效应对无控制、半主动控制和被动控制斜拉桥的桥塔均具有很小的不利影响,仅使桥塔内力增大约10%,对主梁均具有显著不利影响,使主梁内力增大近8倍;行波效应对半主动控制和被动控制减震效果的不利影响很小,没有出现明显的控制效果变差的现象。
In order to study the effect of traveling wave effect on the seismic response of the cable-stayed bridge under the shock absorption control, a method of calculating the damping control of long-span bridges under multi-point ground motion is derived. Taking a large span floating cable stayed bridge as an example, And the dam, a three-dimensional finite element model is set up, and the damping effect of the semi-active control and passive control on the cable-stayed bridge is analyzed. The results show that the semi-active control moderates the bridge’s seismic response more gently, while the passive control controls the bridge’s seismic response drastically. Therefore, the passive control should be used with caution. The traveling wave effect on the uncontrolled, semi-active and passive control The bridge tower has a small negative impact, only to increase the internal force of the bridge tower about 10%, have a significant adverse effect on the main beam, the main beam internal force increased nearly 8 times; wave effect on the semi-active control and The negative effect of passive control of damping effect is very small, there is no obvious control effect worsened phenomenon.