ABSTRACT
Based on the assumption that the external load effect of the test beam is similar to the vehicle load effect, a test verification method for the load limit value of highway bridges is proposed. First, based on the field static load test data of three 13m full-size reinforced concrete hollow slabs, the imposed load limit of the test beam is determined according to the mid-span deflection, as well as the crack and strain limit of tensile reinforcement of the reinforced concrete beam. Then, the resistance standard value is calculated according to the design size of the test beam and the standard value of material strength. The dead load effect and vehicle load effect corresponding to different live dead load ratios are determined according to the design expression of flexural member-bearing capacity in Code 85 and Code 04. Finally, according to the bridge load limiting coefficient under different safety levels and the midspan bending moment generated by the maximum allowable external load, the theoretical load limiting value and the test load limiting value corresponding to different live and dead load ratios are calculated. The results show that the ratio between the safety test limit value and the theoretical limit value calculated according to different load limit levels is greater than 1.0, which verifies the rationality of the proposed simplified analysis model and the limit value of the bridge load limit.
