Experimental Study on Bearing Capacity for Prestressed Concrete Hollow Slab Beam Bridge with Severe Diseases
To evaluate the influence of existing diseases on the bearing capacity of bridges,taking a prestressed concrete hollow slab beam bridge across railway lines as the case,a in-situ static load test was implemented to investigate the bearing capacity of the bridge.According to the requirements for guaranteeing the safety of railway operation,the deflection,strain,development of crack width as well as the camber of the bridge were measured in different test bridge spans.The theoretical values of deflection and strain were calculated by using numerical simulation.On that basis,the structural calibration coefficient and transverse distribution coefficient of the bridge were analyzed.Thus the bearing capacity of the bridge was evaluated comprehensively.The results show that the calibration coefficients are distributed between 0.22 and 0.51.The measured transverse distribution coefficients are in good agreement with the theoretical values.The width of the longitudinal crack at the bottom of the beam does not change significantly with the test load,the occurrence of the crack has little relationship with the vehicle load.The camber of the hollow slab beams in the range of 32.8 mm to 42.3 mm,indicating that the beams have sufficient prestress.
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