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 ,结果进一步论证了理论实体模型的精确性 Runyang Yangtze River Highway Bridge is the largest under construction in China. The cable tower, as one of the important structural components, grasps the dynamic characteristics of the structure and can improve the theoretical analysis model so as to establish a full bridge model and further establish a Yang Bridge structural safety and health monitoring system to provide the most primitive fingerprint data. The test is carried out in strict accordance with the operating procedures under the conditions of the environmental incentive method. After statistical analysis of the test data, the dynamic characteristics of the pylon structure are obtained. On this basis, the theoretical model is revised. Then, the finite element modal analysis of the model is carried out. The obtained results are quite close to the test results with very little error, which proves the correctness and reliability of the theoretical model. On the basis of the measured results and theoretical model analysis results, the finite element model of the pylon is established. The modal analysis of the pylon model is carried out. The results further demonstrate the accuracy of the theoretical model