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为了研究大跨斜拉桥拉索振动频率的环境时变特征,本文对苏通大桥斜拉桥的拉索振动响应进行了模态频率识别,并详细地考察了日常运营条件下实测模态频率的环境变异性。分析结果表明,温度的变化对斜拉桥拉索各阶振动频率的影响很小,相反,交通荷载与拉索实测模态频率存在较为明显的相关关系,即拉索各阶振动频率基本随车流量增大而线性增大。在此基础上,本文建立了基于模糊模式识别的拉索异常状态预警方法,实现了对拉索振动频率异常的在线监测与预警。
In order to study the environmental time-varying characteristics of cable vibration frequency of long-span cable-stayed bridge, this paper modal frequency identification of cable vibration response of cable-stayed bridge of Sutong Bridge, and investigated in detail the measured modal frequency under daily operating conditions Environmental variability. The analysis results show that the temperature has little effect on the vibration frequency of the cables of the cable-stayed bridge. On the contrary, there is a clear correlation between the traffic load and the measured mode frequency of the cable. Flow increases linearly. On this basis, this paper establishes a method of early warning of abnormal state of cable based on fuzzy pattern recognition, and realizes online monitoring and early warning of abnormal vibration frequency of cable.