Abstract
ABSTRACTPresented in this paper is a study on the performance of load‐bearing cold‐formed steel (CFS) walls with web‐perforated studs subjected to standard fire evaluated with use of sequentially uncoupled 3D finite element (FE) thermal‐stress analysis. The walls are sheathed with double layers of MgO board, Type C gypsum board, or mixed Type X and MgO board. The predicted failure times obtained from finite element analysis (FEA) are compared with those of full‐scale fire tests of load‐bearing CFS walls. The FEA results indicate that simulating CFS wall fire tests using a single stud model is acceptable. The difference between failure times predicted by the single stud model and fire tests is not significant. To account for possible force and stiffness interactions among the wall studs, modelling the load‐bearing fire wall tests using a CFS wall frame to obtain the system‐level response is also discussed. The FEA results obtained from the CFS wall frame model indicate that the middle interior studs may experience considerably higher loads than that applied to an equivalent single stud model. Consequently, the single stud model may overestimate failure time. Thus, interactions among the CFS wall studs should be considered in FEA to evaluate the performance of the wall system in fire.
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