Modal analysis and optimization design of modular steel structures used in construction

In order to improve the stability and reliability of modular steel structures and reduce design redundancy, a multi-objective optimization study was conducted based on modal analysis. The finite element method was used to obtain the natural frequencies and modes under actual constraint conditions through ANSYS. The first-order natural frequency was used as a constraint condition to rationally configure the dimensions of the modular steel structure, and lightweight design was carried out based on the response surface method. In order to meet the overall structural stiffness requirements, the weight of the structure was minimized as much as possible. The finite element analysis and modal verification of the optimized model were carried out to verify the optimization results that meet the design requirements. The results show that the weight of the model was reduced by 5.36 %, and the increase in the first-order natural frequency was 20.14 %. After analyzing and verifying the modal vibration mode structure, it was found that the optimized modal vibration mode structure could still meet the mechanical performance requirements, providing an important reference for research in the field of building engineering.