Design and practice of the automatic monitoring system for the bridge's structure security in active service

The secure monitoring problem of the bridge's structure in active service is the hotspot problem to which the whole bridge field is paying attention all the time. The sensor can obtain the stress and the strain's situation of the bridge's parts, but the strain is only a relative one. How to obtain the integral and absolute strain information of the bridge's structure is a hard nut to crack. On the basis of the cause supra, the automatic monitoring system about the bridge's structure security in active service based on the RTK-GPS technology and the measuring robot has been developed. Load Response Spectrum Method, an effective method to diagnose the bridge's health status, which is based on the monitoring data's characteristic of the two automatic monitoring technologies. The basic principle, monitoring method and monitoring process of these two automatic monitoring technologies are introduced.