Experimental Study on the Loading of One-tower Double Plane Cable-stayed Bridge
In order to accurately assess the bearing capacity and working condition of the cable-stayed bridge when it is completed,to check whether the bridge structure meets the requirements of the design and relevant norms,and to provide a technical basis for the bridge handover acceptance,this paper takes Ligui bridge(one-tower double plane prestressed concrete cable-stayed bridge)as the research object.Midas Civil was used to establish the finite element single girder model of the cable-stayed bridge.The paper mainly introduces the main test section and test content of the load test inspection of cable-stayed bridge.A comparative analysis was done on the static theoretical calculations and themeasured data of the main girder strain,deflection,longitudinal horizontal displacement of the top of the main tower tower,cable force increment.And the self-oscillation characteristics and dynamic characteristics of the dynamic load test were analyzed.The results show that:1)the bridge static load test parameters calibration coefficients are within the reasonable range of specification requirements,the relative residual strain is less than 20%;2)The self-oscillation frequency,damping ratio and dynamic response of the structure are in the normal working state.The bridge is in the overall elastic working state with a good force state,which meets the design loads and the use requirements of the relevant codes.
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