Multi-objective Structural Optimization Design Of Suspension Bridge Test Model

The suspension bridge as a bridge that the main cable is the main load-bearing component,with the advantages of cost economy,reasonable force,strong ability to span and maximum strength of materials,has become one of the best options over a span of 1000 meters of bridge.Structural optimization design can make the suspension bridge structure to meet all the design requirements under the premise of economic and energy saving,so the structural optimization design research of the suspension bridge has become the significant research direction of the vast majority of scholars.In this paper,a 10m laboratory suspension bridge model as the research object,research on structural optimization design using ANSYS software.Firstly,the finite element model of suspension bridge is established by using ANSYS software,and the calculating data of static analysis and modal analysis are used to test the correctness of the model by comparing with test data.Secondly,the concept,classification and algorithm of structural optimization design are introduced in detail.At the same time,the application of ANSYS software in structural optimization design is also described in detail.On the basis of this,the single objective optimization design is completed with the maximum deflection value of the stiffening girder and the weight of the stiffening girder as the objective functions.Thirdly,the theory and method of multi-objective optimization problem are studied deeply.Compare and analyze the advantages and disadvantages of various multi-objective optimization methods and applicable conditions.According to the characteristics of the laboratory suspension bridge model,choose suitable methods for multi-objective optimization design.Finally,on the basis of single objective optimization,using the ideal point method,linear weighting method and component calculation method to construct new evaluation functions with the two single objective functions,which are the maximum deflection value of the stiffening girder and the weight of the stiffening girder to complete the research on multi-objective optimization design.The research contents and analysis,calculation results of each chapter are summarized,the results show that the multi-objective optimization design of the suspension bridge test model is suitable for the multi-objective optimization methods,so the method can be chosen according to the actual situation.The research results provide theoretical basis and reference value for multi-objective structural optimization design of suspension bridges test model.