采用TMD的人行桥人致振动测试与减振研究

Human-Induced Vibration Test and Vibration Reduction Research of Pedestrian Bridge Using TMD

摘要:

为研究大跨径钢桁架景观人行桥人致振动舒适度及其减振措施，针对大跨度、低刚度、低阻尼的景观人行桥，以人致振动加速度为优化目标，修正理论模型后设计调谐质量阻尼器（TMD），并结合单人/多人荷载模拟，对安装TMD前后的桥梁竖向振动特性进行评价。同时以苏州市某主跨径120 m的3跨钢桁架人行桥为例，采用数值模拟与现场实测得到其结构固有频率，通过人致激励响应对该桥进行舒适度评估。结果表明，布置TMD后，该桥竖向振动加速度明显降低，舒适度得到显著提升，验证了该方法的可行性和合理性。

Abstract:

To study the human-induced vibration comfort and vibration reduction measures of long-span steel truss landscape pedestrian bridges, for long-span, low-stiffness and low-damping landscape pedestrian bridges, the TMD is designed after correcting the theoretical model with the human-induced vibration acceleration as the optimization objective. Combined with single-person/multi-person load simulation, the vertical vibration characteristic of the bridge before and after equipped with TMD are evaluated. At the same time, taking a three-span steel truss pedestrian bridge with a main span of 120 m in Suzhou as an example, the natural frequency of its structure is obtained through numerical simulation and field measurement, and its comfort is evaluated through the human-induced excitation response. The result shows that after TMD is arranged, the vertical vibration acceleration of the bridge is significantly reduced, and the comfort is significantly improved, verifying the feasibility and rationality of the method.