Finite element model updating of beam bridge based on response surface method and genetic algorithm
In order to maximize the benefits of the massive monitoring data generated by the self-developed in-telligent health monitoring platform,a structural analysis module was added to the platform to expand its applica-tion field.A finite element model updating method combining response surface method and genetic algorithm was proposed based on the accuracy and reliability of finite element model analysis.Firstly,a finite element model of structural theory based on design data was established and the structural update parameters were determined;secondly,the central composite design method was used to obtain sample points and calculate structural respons-es;then,the significance testing was conducted based on the stepwise regression analysis and the response sur-face function relationship between the updated parameters and the feature response was obtained by the least square fitting method;finally,the objective function was constructed by combining the static and dynamic re-sponses of the structure,the genetic algorithm was used to solve the objective function iteratively,and the optimal solution was substituted into the theoretical finite element model,so as to update the structural finite element model.Taking a simply supported beam as an example,the finite element model of the beam was updated with elastic modulus and moment of inertia of the section as updating parameters,frequency and displacement as structural response,based on the results of static and dynamic tests,which helps verify the effectiveness of the proposed method.The results indicate that the relative error between the updated finite element model calculation and analysis results and the measured values is significantly reduced,and the calculated values are closer to the measured values.The finite element model updating method based on response surface methodology and genetic algorithm can provide a more accurate finite element model for intelligent health monitoring platform,thus pro-viding convenience for modules such as damage identification and early warning evaluation.
finite element model updatingresponse surface methoddynamic and static load testgenetic algo-rithm
万方数据
维普
