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以一座容易发生较大竖向振动的人行天桥为工程背景,对其进行减振试验研究。通过建立人行天桥的有限元模型对人行天桥进行自振特性及人群荷载作用下的强迫振动分析,竖向加速度超过舒适度限值。根据该桥的一阶模态参数,设计了调谐质量阻尼器(TMD)的最优参数,对其进行被动控制。数值分析表明,设置TMD后天桥的一阶模态阻尼比明显提高,竖向振动加速度降低显著。最后进行了安装TMD后的天桥减振效果实测,人行天桥一阶竖向振动阻尼比明显增大,减振效果明显。
Taking a pedestrian bridge prone to large vertical vibration as the engineering background, the vibration test is carried out. Through the establishment of finite element model of pedestrian bridge, the pedestrian bridge is subjected to self-vibration characteristics and forced vibration analysis under crowd load. The vertical acceleration exceeds the comfort limit. According to the first-order modal parameters of the bridge, the optimal parameters of the tuned mass damper (TMD) are designed and controlled passively. The numerical analysis shows that the first-order modal damping ratio of the flyover is significantly increased and the vertical vibration acceleration is significantly reduced after the TMD is set. Finally, after the installation of TMD suspension bridge vibration effect measured, pedestrian bridge first-order vertical vibration damping ratio increased significantly, damping effect is obvious.