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Abstract

The principal purpose of this paper was to investigate the evaluation method of performance for existing reinforced concrete bridges. The least squares technique in classical mathematics was adopted firmly to establish both the multiple objective weight distribution method and multiple span level weight method. Thus, the multiple objective and span evaluation method were built for estimating the performance of existing reinforced concrete bridges. The evaluation model may be divided into grades I, II, III and IV which are described as non-damage, light damage, severe damage and unfit for service, respectively. Using the proposed model, the Huey-tong bridge, Jzyhchyang bridge, Ay-gow west road viaduct and old Hwan-nan viaduct in Taipei were chosen for evaluation. The evaluated results of the present investigation indicate that four existing bridges all belong to grade II. If periodic small scale repair and reinforcement are carried out, then the four bridges can be continuously used. The order of repair and reinforcement is the Huey-tong bridge, Ay-gow west road viaduct, old Hwan-nan viaduct and Jzyh-chyang bridge. Thus, the multiple objective and span evaluation method appears to be advantageous for evaluating the damage grade of existing reinforced concrete bridges. The results of this study were provided as a basis for repair, reinforcement, and demolition of existing reinforced concrete bridges.

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