The Static Load Test Of Field Test Data Application Research On Parameter Identification Of Prefabricated Girder Bridges

Currently in China ’s Medium-small Span bridges, the proportion of prefabricatedbridgs is great due to its unique design and construction of the economic benefits. Theircarrying capacity of these structures in the different service lives declines than the initialvalue of the design in varying degrees. Therefore, they are faced with the assessment ofits detection, pursuant to determine whether it is necessary to carry out repair andreinforcement of the decision problem.Paper relies on the load test of Baoquanling II highway bridge. By designingparameter identification conditions, the deflection data collected during the load test wasused to calibrate a detailed baseline finite element model in an effort to represent the truesystem behavior of this pre-stressed simply supported-continuous bridge. Assumingstructure works in the elastic range durning identification, identifying the parametersselected beam stiffness. Algorithm objective function is set to differential deflection ofeach measuring point. At the end, the parameter is given by Newton iterative method ofleast squares sense of identification value to obtain the finite element model as amended.Field data for this paper, through the identification of values of different parametersgrouped under the screening and selection, the secondspanning and the forthspanning isnot sufficient to reach the carrying capacity to meet the requirements, it is necessary toprovide reinforcement assessment conclusions.