Reasearch On Updation Of Suspension Bridge Model Of Steel-Concrete Composite Beam Based On Response Surface Method

With the requirements for beautiful appearance of cross-river and cross-river bridges in my country’s urbanization construction,the use of steel-concrete composite beam self-anchored suspension bridges with a short construction period and low engineering cost in the field of municipal engineering is increasing.The use of steel-concrete superimposed beam structure can give full play to the characteristics of steel and concrete materials,but the characteristics of the structure are difficult to grasp its stress characteristics and behavior.Through the static and dynamic load tests of the bridge,it can be found that the static and dynamic analysis values in the finite element model established on a reasonable basis are in error from the measured static and dynamic values of the load test.Taking into account many factors such as material parameter error and construction error of the establishment of the finite element model,the reference surface method is applied to the modification of the finite element model of the steel-concrete composite beam self-anchored suspension bridge,thereby enriching the steel-concrete composite beam self-anchor The research content of the suspension bridge.The main research is as follows:(1)The research status of finite element model modification is systematically sorted out and analyzed,the finite element model modification method based on response surface method is determined,and the method and application steps are described.Choose fewer experiments,apply fundamental flaw interval uncertain as test combination method,uniform experimental design method,and the application of steel-concrete composite beams since the suspension bridge finite element model of fixed anchor type,explains the structure parameter error of three major sources,at the same time,the selection of response values the accuracy of the response surface function model building and related inspection,and the objective function of optimization method etc.(2)Taking Guihua bridge as the engineering background,the finite element model was established by Midas/Civil for theoretical calculation and analysis,and the static and dynamic load tests were carried out on the solid structure of the bridge to obtain the response values of static deflection and vibration frequency under static and dynamic load tests.(3)The paper first put forward and the Plackett-Burman test to preliminary screening of more stay fixed parameters,then through central composite design and uniform design experiment method for correction parameters test combination of input and output response value,through the analysis of variance significant evaluation,through the analysis of both stay fixed parameters significant comparing response values corresponding correction parameters.On the basis of the filtered correction parameters and the static and dynamic load test data information,constructs the quadratic polynomial response surface function model completely amended,static and dynamic state is established on both single objective function and the combination of multiple objective functions,using the genetic algorithm respectively to its optimal solution after correction of the finite element model based on the measured data of static and dynamic load test to obtain information as the response value of the finite element model,comparing the correction effect under different objective function,analysis of different parameters on the updated finite element model response value correction result.