数字图像相关法在桥梁伸缩缝监测预警中的应用

Application of digital image correlation method on monitoring and warning of bridge expansion joint

为了提高桥梁伸缩缝的监测水平,引入数字图像相关法,监测运营状态下的桥梁伸缩缝的变化情况,选择河北某大桥为试验对象,利电荷耦合装置(CCD)摄像机拍摄下该桥运营状态下伸缩缝的图像,进一步,将图像输入分析软件中,得到伸缩缝的位移信息;再利用均值控制法分析该伸缩缝的位移状况,判定该桥的安全状态。结果表明:利用数字图像相关法监测工作状态下的桥梁伸缩缝,可实现远程控制,节约了成本,提高了效率,而且不影响桥梁的正常运营。

In this paper,combined with average control method,digital image correlation method was introduced to monitor and warn bridge expansion joint and determine safe state of bridge. A bridge in Hebei province was selected as experiment object. CCD camera is used to record the images of bridge expansion joint. And then the images were input into the software of digital image correlation to obtain the displacements of bridge expansion joint. By use of average control method,the displacements were analyzed to determine the safe state of the bridge. The experimental results show that the method can be successfully used in monitoring bridge expansion joint without affecting the bridge’s normal operation.