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通过有限元分析和基于环境激励的模态试验分析,研究了润扬长江公路大桥南汊悬索桥挂缆前后桥塔的动态特性。在分析挂缆后桥塔动态特性时,将上部结构的作用转化为弹性约束,建立了等效模型进行分析,推导了主缆等效约束刚度的近似计算公式。结果表明:挂缆前后桥塔顺桥向动态特性变化较大,横桥向变化较小;等效有限元模型是合理的,悬索桥的振动可以分为2种体系运动,塔的振动特性可以单独取出进行分析。该结论为验证设计理论和后期维护提供了重要依据。
Through the finite element analysis and the modal test based on environmental excitation, the dynamic characteristics of the bridge tower before and after the suspension bridge of Nanxun suspension bridge of Runyang Yangtze River Highway Bridge are studied. After analyzing the dynamic characteristics of pylons, this paper transforms the superstructure into an elastic constraint and establishes an equivalent model for analysis. The approximate formula for calculating the equivalent stiffness of the main cable is deduced. The results show that the dynamic characteristics of the bridge along the bridge before and after the cable suspension vary greatly and the changes of the transverse bridge are small. The equivalent finite element model is reasonable. The vibration of the suspension bridge can be divided into two kinds of system movements. The vibration characteristics of the tower can be separated Remove for analysis. This conclusion provides an important basis for verifying the design theory and the post-maintenance.