| Portal frame light steel structure building is one representative of light steel structure in china,one of the most widely structure shape at present.But,if dimension of portal frame is unreasonable,steel weight can increase.At present,design of portal frame general use trial-and-error method in china:Define the primary parameter (structure arrangement of portal frame and section types of various components);and then,choose the section size according to restriction conditions (basis for design code:strength,stiffness and stability of components);After making proper correction according to structural calculation。it may be used as the final repair scheme。We get relation between steel weight of optimized structure and the section size by sectional optimal analysis.So it is important to proposed rationalization suggestion according to the analytical results.In this thesis,an optimization design is discussed on the basis of a portal frame structure that was entrusted to an architectural institute by our college.The aim of the optimization design of the frame structure is the least steel amount and the lowest engineering cost on the premise of structure safety.The FEM software is used as a platform to build a finite element model of the portal frame with a parameterized design language APDL.The portal frame is analyzed into BEAM3 units according to the technical specification for steel structure and the model situation with the elasticity analysis method.In addition, the production practice and material specification series are also fully considered.After optimization the portal frame is reduced obviously to a weight of 1.624 T and have a noticeable economic effect.
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