RELIABILITY EVALUATION OF BRIDGES THE RESPONSE SURFACE METHOD AND THE BAYESIAN MODIFICATION METHOD

Lei Fu, Lina Xiang, Bojian Xu, and Jiakuan Shi

Keywords

Bridge, reliability evaluation, ultimate state, response surface method, Bayesian modification method

Abstract

To evaluate the performance of in-service bridges, the Bayesian theory was employed to evaluate the reliability of the bridges. According to the Bayesian prediction principle, a Bayesian modified parameter distribution model was established. As an example, the compressive strength of the concrete was modified. Based on the response surface method, the ultimate state equation of the bridge structure was established. The bearing capacity of the bridge was taken as the resistance. The self-weight of the bridge and the load of the vehicle were taken as the load effect. The parameters of the ultimate state equation were ascertained using the fitting results of the finite element model. After combining the response surface method and the Bayesian modification method, a bridge reliability evaluation method was proposed. The experimental verification was carried out to verify the feasibility and accuracy of the method. The results indicated that the proposed bridge reliability evaluation method was feasible for use in practical engineering. In addition, the problem evaluation method could provide guidance for the formulation of a maintenance strategy.

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