Fast bridge damage detection based on portable sensing equipment

This paper improves the existing indirect bridge damage identification method based on vehicle-bridge coupling. The coupling vibration model of vehicle body and wheel is introduced to modify the coupling model of vehicle bridge. By installing the portable acceleration sensor in the vehicle body position, the problem of the installation, maintenance and replacement of the acceleration sensor is solved, and the rapidity and convenience of the bridge indirect damage identification method is effectively improved. The difficulty of the improved indirect damage detection method is to determine the excitation frequency of the bridge road surface in advance. In order to solve this problem, this paper proposes a road roughness acquisition method based on vehicle acceleration. The power spectral density function is used to analyze the collected road roughness and determine the excitastion frequency of the bridge road surface. Through vehicle-bridge coupling experiment, the damage condition of remove the diaphragm under the bridge was identified by using the portable sensor equipment. The experimental results show that the indirect damage detection method based on portable sensor equipment can effectively and quickly identify the damage of bridge structure.