Analysis of Cold-Formed Steel Frames under Wind Loading
Keywords:
Cold-formed Steel, Wind Load, Nonlinear Static AnalysisAbstract
This paper presents a study on behavior of cold-formed steel industrial frames under wind loading. The frames in the study are conventional portal frames composed of back-to-back lipped channel sections, and connected by using bolt and gusset plate system. The frame design is based on the design specifications for the cold-formed steel members and connections, for partially enclosed buildings, under the design wind load for the Northeastern region of Thailand. To study the behavior of the frames, the numerical analysis is based on the nonlinear static procedure under lumped plasticity assumption for the members, semi-rigidity assumption for the connections, and incorporation of the secondary moment. The results have shown that the joint semi-rigidity assumption and the P-Delta effect consideration significantly affects the load-deflection relations of the frames. Two types of the frame failure have been observed, including the joint failure and the member failure, depending on the semi-rigidity level of the joints. It is found that this type of the frame, under the given wind load, tends to fail at the column bases.
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