红石拱桥损伤检测与识别

在吉林红石混凝土拱桥的健康监测中，采用以动态观测为基础的柔度投影法与模态应变能法相结合进行损伤识别．通过越障试验获取必需的拱桥振动模态与振动频率等参数，以柔度投影法为主进行损伤定位识别，以模态投影法为主进行损伤定量，可以获得较好的效果．该方法简便易行。并具有一定的识别精度．建议在实际工程中推广应用．由于在损伤定量识别中还存在一定误差，最大偏离可达30％～40％，需要进一步研究改进．

Damage detection and identification of Hongshi arch bridge

For the health monitoring and the damage detection of Hongshi concrete arch bridge in Jilin Province, the combined flexibility projection method and the modal strain energy method based on the dynamic field observation data were employed. The necessary parameters of the vibration mode shapes and the vibration frequencies of the bridge were determined by a truck moving across obstacles. Reasonable results can be obtained when the damage positions are identified by the flexibility projection method and the damage degrees are detected from modal strain energy method. The proposed method is simple, convenient and can give acceptable accuracy, so it is recommended to be applied to engineering practice. As certain errors may be made in the damage degree detection, the maximum deviation may reach as high as 30% to 40%, and further improvement of the method is needed.