某钢桁架人行桥自振特性测试及振动控制研究

Self-vibration Characteristics Test and Vibration Control for A Steel Truss Pedestrian Bridge

对某振感较大的钢桁架人行桥进行了自振特性测试,并利用有限元分析软件Midas Civil建立桥梁结构的空间分析模型,通过基于实测数据的模态分析结果与理论分析结果的比较,确定桥梁结构的刚度和自振频率是否满足规范要求,并对桥梁上部结构进行改造,通过增加结构刚度来改善桥梁的自振频率和振动特性,为此类桥梁类似问题的解决提供参考。

This paper carried out a self-vibration characteristics test of a pedestrian bridge which appeared oversized vibration, and established spatial analysis model using finite element analysis software Midas Civil. Determination was made of the stiffness and free-vibration frequency about bridge structure whether meet and the requirements of standard, by comparing the modal analysis results based on the measured data with the theoretical analysis results. And the stiffness of structure was strengthened by the transformation of bridge superstructure to improve the natural frequency and self-vibration characteristics of bridge. It provided a reference for the solution of similar problem of this type of bridges.