润扬大桥悬索桥索塔结构动力特性实测

Dynamic Property Measurement of Tower Structure of Runyang Bridge

润扬长江公路大桥是我国在建规模最大的索支承结构 ,索塔作为其中一个重要的结构组成部分 ,掌握其结构动力特性 ,可以完善理论分析模型 ,从而为全桥模型的建立和进一步建立润扬大桥结构安全健康监测系统提供最原始的指纹数据。本次测试是在严格符合各项操作规程的条件下 ,采用环境激励法完成的 ,在对测试数据进行统计分析后 ,获得了索塔结构动力特性 ,并在此基础上 ,修正了理论模型。然后 ,对模型进行了有限元模态分析 ,所得结果与测试结果比较 ,相当接近 ,误差极小 ,证实了理论模型的正确性和可靠性。并在实测结果和理论模型分析结果的基础上 ,建立了索塔的有限元杆系模型 ,通过对其进行模态分析 。

Runyang Yangtze River highway bridge, a structure supported by cables, is the longest bridge project at present. The tower structure is an important part of the structural components. Once mastering the dynamic property of the tower, its theoretic model can be perfected, and the most primary data are offered for the bridge model, furthermore for the health monitoring system of the Runyang bridge. According strictly to all methods of operation, this survey was completed adopting the ambient vibration, and the result of the tower dynamic property was obtained by the statistic analysis of data, and based on the result, we revised the academic model. Another result was obtained by modal analysis of FEM software. Both results are close, and the error is tiny. It affirms the validity and reliability of 3D finite element model.