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Research on Bearing Capacity of Three-span Simply Supported Skew Bridge Based on Load Test

JIA Yi;LIAO Ping;WANG Yong-bao;ZHAO Ren-da;School of Civil Engineering,Southwest Jiaotong University;  
In order to understand the security under normal operation state and the carrying capacity under adverse conditions of a three-span simply supported skew bridge with large widthspan ratio,the stress and deformation of the main beam under the condition of unbalance load and medium load were studied based on the test method. The natural vibration frequency,deformation response under different diving speeds and the impact action of bridge under vehicle jump test were studied through pulse test,barrier-free driving test and obstacle driving test,and the test results were compared with the finite element results.The results show that the midspan section under medium load is the most unfavorable load condition.The measured values of strain and deflection are less than the calculated values under the unfavorable load conditions,and the deformation of the main beam and the stress of concrete both meet the requirements of the specification.When the speed is within 30km·h-1 in barrier-free driving test,the impact coefficients of each span are 1.094 to 1.192.When the speed is 10km·h-1 in obstacle driving test,the impact coefficients of each span are 1.147 to 1.195.The structural strength and stiffness of the bridge are rich,which can meet the actual operating conditions well.
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