Curvature Mode-Based Damage Identification Method For Bridge Health Monitoring System

In recent years, as China's rapid development of transportation, accompanied by the increasing density of road network, the emergence of new types of bridges; the same time serving as the bridge over time, and many there have been many problems in the bridge, bridges aging, deterioration is serious. Mainly due to the damage of the bridge is not taken seriously enough, if we can establish early in the Bridge health monitoring and safety evaluation system, to fully understand the actual health status of the bridge structure, can prevent sudden catastrophic accident, the protection of national property people's lives and safety.This bridge carried out structural damage detection is based on the curvature mode shape and to bridge health monitoring and safety evaluation system as the backing. This paper introduces the bridge health monitoring and safety evaluation system development, theory of bridge health monitoring system, and discussed a variety of bridge damage identification methods, and based on curvature mode shape of bridge damage identification theory. Finally, ANSYS finite element analysis of a three-span continuous box girder bridge simulation analysis of the damage process, and the three-span continuous box girder bridge health monitoring system for in-depth study of the bridge structure to achieve optimal sensor placement , Simulation of damage identification and classification of early warning systems such as security, draw some meaningful conclusions, the bridge structure damage identification methods for the promotion and application of accumulated data, and for health monitoring and safety assessment system provides a reference. In this paper, research results and innovations are as follows:1, In the existing mode shape curvature based damage identification method based on the search for structural damage identification parameters with high sensitivity, high sensitivity to determine the damage identification parameters, and use them to identify the damage parameters as the high sensitivity damage identification index, the realization of the bridge structure damage identification.2, Identification of sensitive parameters of injury, summed up the operational phase for different, different degree of injury and whether or not the bridge intact model information structure damage identification index.3, For a continuous box girder bridge SENSOR layout optimization, damage detection studies, the establishment of evaluation index system of the bridge structure, bridge structure established grading system for assessment of health and safety classification of early warning systems and so on.