桥梁动态应变的压电传感和远程监测的研究

The Research on Piezoelectric Sense and Remote Monitoring for the Dynamic Strain of Bridge

桥梁动态应变的远程监测对于确保桥梁安全运行具有十分重要的意义。以压电方程为基础 ,论述了采用压电片对桥梁的动态应变进行传感的理论和方法 ,得出了压电片的输出电荷与所传感的动态应变之间的理论关系式和工程应用中的传感计算公式 ,然后结合现代通讯技术 ,研制了基于公用电话交换网的远程监测系统 ,实际应用于红槽房大桥的动态应变监测中 ,并获得了满意的结果。

The remote monitoring for the dynamic strain of bridge is very important for its safety.On the basis of piezoelectric equation,the method of dynamic strain sense using piezoelectric patches has been discussed in this paper.We analyze the theoretical relationship between the output charges of piezoelectric patch and its sensing dynamic strain.Then the practical formulations are given.We have implemented the remote monitoring system based on the public switch telephone network (PSTN) and achieved satisfied results for the Hong Caofang Bridge.