Study On The Mechanical Behavior And Economic Performance Of Thin-walled Steel Assembled-infilled Wall-steel Frame

In this paper, on the basis of resourcing a large number of literature, nonlinner finiteelement analysis is adopted to investigate the mechanical performance of cold-formed steelcomposite infilled wall-steel structure system.Firstly,the performance of single-floor cold-formed steel composite infilled wall-steelstructure system,which works separately with single face plaster board,single face orientedstrand board(OSB),plaster board+oriented strand board,are analysed.The results show thatthe composte wall worked as infilled wall can cooperate with steel frame well,the bearingcapacity of the whole system is larger than the sum of the individual bearing capacity of thecomposite infilled wall and steel frame,and the cooperative work between composite infilledwall and steel frame can increase the bearing capacity of the whole system by0.7~1.2timesof the bearing capacity of the composite infilled wall.The ductility performence degradationof single-floor cold-formed steel composite infilled wall-steel structure system is evidentunder cyclic loading when compared with pure frame.Then, in this paper, numerical simulation analysis of double-storey thin-walledcold-formed section steel composite infilled wall-steel frame structure system is conducted,the result shows: compared with steel frame, double-storey thin-walled cold-formed sectionsteel composite infilled wall-steel frame structure possess a significantly larger bearingcapacity and lateral stiffness, on the other hand, the ductility of the wall-frame system isrelatively in degradation; however, its ductility and energy-dissipating capacity is superior toordinary infilled walls. Moreover, the objective of this paper is to investigate the influence ofbraces of keel, spacing of braces and axial force ratio of columns. It is found that the braces ofkeel can restrain the yield of keel, which contributes to improve the cooperative actionbetween composite infilled wall and steel frame. The bearing capacity of the wall-framesystem decreases with a decrease in spacing of keel; when axial force ratio increases, the wallyields more rapidly, and the ductility goes down.Finally, based on many relevant literatures, this paper makes efforts to conduct inductiveanalysis on the feasibility of using thin-walled cold-formed section steel composite wall as infilled wall.