结合TMD的钢板组合梁人行桥舒适度分析

Analysis on Comfort of Steel Plate Composite Beam Pedestrian Bridge with TMD

摘要:

随着城市人行桥向着轻盈、美观的方向发展，人行桥的舒适度问题越发突出。为了研究1座主跨43 m的双主梁式斜腹板钢板组合梁人行桥在行人荷载作用下的振动问题，采用有限元计算软件模拟了桥梁结构在行人激励荷载下的动力响应，并比较了不同质量比的阻尼器对结构动力响应的影响。结果表明：该桥竖向1阶、2阶振动模态均有可能被激发，需要进行舒适度验算；应根据不同自振模态合理设计阻尼器参数，以满足舒适度要求；阻尼器质量比增加有助于控制结构的动力响应，但二者并非线性关系。

Abstract:

With the development of urban pedestrian bridges in the direction of lightness and beauty, the comfort problem of pedestrian bridges has become more and more prominent. In order to study the vibration problem of a double-girder inclined-web steel plate composite beam pedestrian bridge with a main span of 43 m under the action of pedestrian load, the finite element calculation software is used to simulate the dynamic response of bridge structure under the pedestrian excitation load, and the influence of different mass dampers on the dynamic response of the structure is compared. The results show that the vertical vibration modes of the first and second orders of the bridge may be excited, and the comfort checking calculation needs to be carried out. The damper parameters should be reasonably designed according to different natural vibration modes to meet the comfort requirements. The increase in the mass of the damper helps to control the dynamic response of the structure, but the relationship between the two is not linear.