Research On Modification Of Finite Element Model Of Nanjing South Railway Station

With the increasing number of high-speed rails in China,many high-speed rail stations have emerged on the railway network.Unlike the traditional civil structure,the high-speed rail station is not a single building structure and bridge structure,but a bridge-building structure.The combination of train tracks and station frame is compared with traditional station buildings.This feature can fully utilize land resources.With the increase of operating time,various types of structural damage will appear in the station building.The accumulation of these damages may affect the safety of the structure and cause serious social losses.Therefore,the safety of the high-speed railway station has become the focus of increasing attention.The use of models for damage identification and health monitoring depends on a finite element model that can reflect the actual structural response.For a large engineering structure,one of the main problems of model modification is the efficiency of calculation.Explicit function relationships are used to fit the relationship between structural design parameters and output response,avoiding the time problem caused by frequent calls to large finite element models,and the resulting function models can also be used with existing mainstream intelligent optimization algorithms Combined to further improve the accuracy and efficiency of model correction.This article first briefly introduces the relevant theory of finite element model modification based on response surface method,including the comparison of two experimental design methods for obtaining sample points,parameter screening based on analysis of variance and fitting of response surface,and finally optimization of the objective function Solve to get the revised result.Taking Nanjing South Railway Station as an example,the structural form of the bridge construction of Nanjing South Railway Station is first introduced.It summarizes the structural characteristics of each part of the station building,the connection between each part and the transmission of force in the station building.At the same time,ANSYS is used.The dynamic characteristics of the main station building and canopy of Nanjing South Rail-way Station are briefly analyzed,and the obtained frequency value is used as the output response.Use the response surface method to modify the model,select each part of the material para-meters as the candidate parameters,use the analysis of variance to determine the input para-meters,generate sample points through the experimental design,substitute the model to calculate the output response,construct the response surface model,and perform perturbed simulation The output data is used as the measured data for model correction,and genetic algorithm(GA)is used to optimize the solution.The correction results show that the error of the finite element model correction using the response surface method is small,which verifies that the finite element model correction based on the response surface method is in the station Practicability in the structure.