Study on method of calibrating state parameters for bridge structure safety evaluation

doi:10.16265/j.cnki.issn1003-3033.2018.09.016

Abstract

Abstract: In order to build an effective finite element model for safety evaluation of bridge structure, a calibration method of mechanical parameters based on the diagnostic test data for bridge structure was worked out. Singularity of sensitivity matrix in sensitivity analysis was avoided by means of regularization of both the mechanical parameters and the load effect parameters. For improving converge efficiency and convergence of the optimization objective function, a penalty function was introduced into it. In addition, by calibrating the finite element model of an existing bridge structural mechanics parameters, the reason for the large deviation between the test data and the load effect value based on the structural design parameters was specified, and the effectiveness of the proposed method was verified. The results show that the mechanical parameter calibration of bridge structure based on diagnostic test can effectively solve the problem of large difference between analysis method and test result, and that it can provide a feasible method for evaluating objectively the safety of bridge structure.

Key words: bridge engineering, mechanics state, diagnostic load test, sensitivity analysis, parameter calibration

CLC Number:

X913.3

LIU Junkui, ZHAO Lihong, WANG Jianmin. Study on method of calibrating state parameters for bridge structure safety evaluation[J]. China Safety Science Journal, 2018, 28(9): 92-97.

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