桥面板厚度对斜拉人行桥动力特性影响研究

Investigation on the Effects of Deck Thickness on Dynamic Properties of a Cable-stayed Footbridge

研究了桥面板厚度对斜拉人行桥自振频率的灵敏性问题。基于有限元方法建立了斜拉人行桥的有限元模型,并对其进行了动力特性分析。进一步建立了桥面板厚度对自振频率的灵敏度分析方法。在此基础上,对桥梁前10阶频率的板厚灵敏度进行了分析计算。结果表明,桥面板厚度的改变可能引起结构频率的增大或减小,不同位置桥面板厚度的改变对结构不同阶次频率的影响存在差异。

The sensitivity of deck thickness to the natural frequency of a cable-stayed footbridge was actively investiga- ted in this studyr The analytical model of the cable-stayed footbridg was firstly constructed based on the finite element method and the dynamic properties were analyzed. Furthermore, the sensitivity computation method of deck thickness to the natural frequency was developed. Then the sensitivity coefficients of deck thickness to the first ten natural frequencies of the footbridge were calculated. The made observations indicate that the changes of deck thickness may cause the in- crease or decrease of natural frequencies, and the effects of deck thickness at different locations are different to some ex- tent.