To develop the cold-formed steel (CFS) building from low-rise to mid-rise, this paper\nproposes a new type of CFS composite shear wall building system. The continuous placed CFS\nconcrete-filled tube (CFRST) column is used as the end stud, and the CFS-ALC wall casing concrete\ncomposite floor is used as the floor system. In order to predict the seismic behavior of this new\nstructural system, a simplified analytical model is proposed in this paper, which includes the\nfollowing. (1) A build-up section with â??new materialâ? is used to model the CFS tube and infilled\nconcrete of CFRST columns; the section parameters are determined by the equivalent stiffness\nprinciple, and the â??new materialâ? is modeled by an elastic-perfect plastic model. (2) Two crossed\nnonlinear springs with hysteretic parameters are used to model a composite CFS shear wall;\nthe Pinching04 material is used to input the hysteretic parameters for these springs, and two crossed\nrigid trusses are used to model the CFS beams. (3) A linear spring is used to model the uplift\nbehavior of a hold-down connection, and the contribution of these connections for CFRST columns\nare considered and individually modeled. (4) The rigid diaphragm is used to model the composite\nfloor system, and it is demonstrated by example analyses. Finally, a shaking table test is conducted on\na five-story 1:2-scaled CFS composite shear wall building to valid the simplified model. The results\nare as follows. The errors on peak drift of the first story, the energy dissipation of the first story,\nthe peak drift of the roof story, and the energy dissipation of the whole structureâ??s displacement\ntimeâ??history curves between the test and simplified models are about 10%, and the largest one of\nthese errors is 20.8%. Both the timeâ??history drift curves and cumulative energy curves obtained\nfrom the simplified model accurately track the deformation and energy dissipation processes of the\ntest model. Such comparisons demonstrate the accuracy and applicability of the simplified model,\nand the proposed simplified model would provide the basis for the theoretical analysis and seismic\ndesign of CFS composite shear wall systems.
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