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为了对运营期斜拉桥拉索安全性进行评估,对拉索索力测试和评估方法作了研究与应用。首先,提出了用最大熵谱代替传统频谱来识别运营状态下拉索自振频率并获取拉索索力的方法;其次,提出了利用模糊聚类理论对索力测试结果进行分类和评估的方法;最后,将上述方法应用于南京长江二桥,提高了拉索测试的效率和精度,实现了过对该桥3次不同时期的拉索安全性评估,并得出该桥在运营期的上下游索力整体上具有明显差异性的结论。研究结果表明:最大熵谱法可以缩短拉索索力的测试时间,特别适合于运营状态下拉索索力的测试和实时监测;模糊聚类分析法可以有效的用于大跨斜拉桥拉索索力的分类与安全性评估。
In order to evaluate the cable safety of cable stayed bridge in operation period, the research and application of cable force testing and evaluation methods are studied. Firstly, the method of using the maximum entropy spectrum instead of the traditional spectrum to identify the natural frequency of cable and obtain the cable force is obtained. Secondly, the method of fuzzy clustering theory is proposed to classify and evaluate the cable test results. Finally, , The above method is applied to the Second Bridge of Nanjing Changjiang River to improve the efficiency and accuracy of the cable test. The safety evaluation of the cable over three different times of the bridge has been achieved. Force as a whole has significant differences in the conclusion. The results show that the maximum entropy spectrum method can shorten the testing time of cable force and is especially suitable for the testing and real-time monitoring of cable force under operating conditions. The fuzzy clustering analysis method can be effectively used for cable force of long-span cable-stayed bridge Classification and safety assessment.