Seismic Optimized Design Of No-supporting Steel Frame Structure's Discrete Variables Based On 《Code For Seismic Design Of Buildings 》

China is located between the circum-Pacific seismic zone and the Eurasian seismic zone, and it is one of the world's maximum mainland earthquakes, so the reasonable structure and the structural seismic analysis method can effectively reduce and prevent disasters caused by earthquakes. Because of the good seismic performance of steel structure, the steel structure houses are widely used in some European and American countries. China's current steel structure design method is relatively complicated and the studies on seismic optimal design are few, so the fast and accurate method of structural design and optimal design is an effective way to promote the development of domestic steel structures.In the actual design of steel structure buildings, most of the design variables are discrete, and genetic algorithm is an ideal algorithm to deal with the issue of discrete optimization. Some optimization criteria in the traditional structural optimization design theory have lost its meaning to discrete variables. This requires us to introduce a new algorithm to handle the optimization problem of discrete variable, and the genetic algorithm is an ideal algorithm to deal with discrete optimization problem. In this paper, based on China's current relevant specifications, with MATLAB software as a platform, a genetic algorithm optimization program is written based on the genetic algorithm toolbox of University Of Sheffield; the structural analysis program for a steel frame is written by using APDL language in Ansys; Ansys software is called through the MATLAB platform. The genetic algorithm optimization program and analysis program for steel frame structure written by APDL language are successfully combined to realize the optimization design of discrete variables of steel frame structure. The materials are selected based on the current market of section steel, so that the optimized structure can meet the requirements of current specification on the strength, deformation and other aspects of steel frame beams and columns, and optimized results are close to the actual design of steel frame structures. Finally, the calculation example of a three-floor framework validates the effectiveness of the algorithm and gives a group of optimal solutions to the generation of 150.