INVESTIGATION THE SEISMIC PERFORMANCE LEVEL OF COLD- FORMED STEEL FRAMES BRACED WITH SHEATHING PANELS

Today for seismic behavior of structures, types of nonlinear static and dynamic analyzes are rapidly expanding. In this study, the nonlinear static method is used to evaluate the performance based on cold formed steel frames. Since these structures are typically performed with low levels, the first mode of vibration is dominate and evaluation of these structures with nonlinear static method, moreover reducing the analysis time, analytical results are obtained almost exact. In this research, after modeling 38 frames of cold formed steel with four different types of sheathing: OSB (Oriented strand board), DFP (Douglas fir plywood), CSP (Canadian softwood plywood) and GWB (Gypsum wall board) and considering different thickness of sheathings, target displacement and lateral drift ratio are calculates for different performance assessments. The results of the study in all the specimens indicates that the linear behavior of the structure is responsive to seismic design and performance point is elastic in the structural behavior.