单索面混凝土矮塔斜拉桥的动力特性

Dynamic behavior of concrete extrados cable-stayed bridges with single cable plane

以厦门银湖矮塔斜拉桥为例,通过引入拉索自振频率影响度的概念,分析了拉索的存在对矮塔斜拉桥自振特性的影响,探讨了矮塔斜拉桥的自振特性与相应连续梁桥(或刚构桥)的区别;在分析矮塔斜拉桥地震反应的基础上,通过引入振型贡献率的概念,分析了高阶振型对矮塔斜拉桥动力性能的影响;分析了矮塔斜拉桥的振型耦联效应。最后首次较全面地总结了单索面混凝土矮塔斜拉桥的动力特性,对进一步认识矮塔斜拉桥的动力性能有一定的参考意义。

In this paper, with Yinhu extrados cable-stayed bridge in Xiamen city as example, a concept of influence degree of natural vibration period of stayed cables is shown, influence of the stayed cables on the natural vibration behavior of the extrados cable-stayed bridges is analyzed. The difference between natural vibration behavior of the extrados cable-stayed bridge and the corresponding continuous beam （or rigid frame） is investigated. Then, based on the seismic response analysis of the extrados cable - stayed, influence of high-order vibration modes on dynamic behavcor of the bridges is analyzed. Further, coupling effect of vibration modes of the bridges is analyzed. In the end, dynamic properties of the concrete extrados cable-stayed bridges with single cable plane are presented comprehensively for the first time. These results have reference value for deeply understanding the dynamic behavior of the extrados cable-stayed bridges.