Study On The Optimization Design Of Light Portal Frame Steel Structures

The portal frame steel structure has been widely used in engineering because the building has many obvious advantages with comparison to the concrete structures.Portal frame structures used in the beams with variable cross-section of welded H-beam cross-section. Most of the traditional design methods rely on the experience of the designers.However,the design of cross-section dimensions often leads to irrational use of materials,economic rationality.This paper is committed to optimizing the methods of research to identify suitable for portal frame structural optimization methods,so that frame the design of more economical and rational.This article briefly describes the characteristics of the door frame,structural layout; design method of internal forces and optimize the research at home and abroad.Analysis of the frame in different combinations of load force,the end-plate connections of beam and column were made by detailed analysis,In this paper,we use finite element analysis software ANSYS optimization feature to optimize the structure.The cross-section parameters of beam and column are variable size. The goal of optimization is portal frame size.And fully take into account the actual conditions of works in a variety of restrictions on the basis of the door frame to optimize,we choose a example to verify the method of this paper.At last,this paper uses element analysis program SAP2000&STS to analyze the geometric of the portal frame steel structure,and derived the rational combination of cross-section parameters.After the optimization design,the consumption of steel than traditional designs in steel consumption was significantly reduced,through rational design,we can save more materials and made the design more rational.