Abstract:The Yongjiang Railway Cable-stayed Bridge is the first railway long-span steel box mixed-girder cable-stayed bridge in China, and it is of great value to carry out load tests on it. Based on the theoretical data obtained by the finite element method, a dynamic and static load test plan was formulated The initial parameters were tested and compared with the design values to serve as the initial data for subsequent tests. The deformation and internal force of the bridge structure under the static test load were measured to check whether it meets the design requirements. The measured values of stress, deflection, and cable force of the test section were compared with calculated values, and calibration coefficients were obtained. The actual bearing capacity of the bridge was evaluated. In addition, the actual working condition of the bridge under the conditions of fully loaded freight trains running at various speeds was also tested. The parameters such as the maximum lateral and vertical acceleration values of the main girder under the dynamic and live load of the train, and the structural damping coefficient were measured and evaluated with reference to relevant codes. Based on the analysis of the dynamic and static load test results, a more comprehensive evaluation of the working performance of the Yongjiang Bridge has been carried out, and the working state of the bridge has met the design requirements.
