Inelastic behavior of cold-formed braced walls under monotonic and cyclic loading

Abstract

The ever-increasing need for housing generated the search for new and innovative building methods to increase speed and efficiency and enhance quality. One method is the use of light thin steel profiles as load-bearing elements having different solutions for interior and exterior cladding. Due to the increase in CFS construction in lowrise residential structures in the modern construction industry, there is an increased demand for performance inelastic analysis of CFS walls. In this study, the nonlinear behavior of cold-formed steel frames with various bracing arrangements including cross, chevron and k-shape straps was evaluated under cyclic and monotonic loading and using nonlinear finite element analysis methods. In total, 68 frames with different bracing arrangements and different ratios of dimensions were studied. Also, seismic parameters including resistance reduction factor, ductility and force reduction factor due to ductility were evaluated for all samples. On the other hand, the seismic response modification factor was calculated for these systems. It was concluded that the highest response modification factor would be obtained for walls with bilateral cross bracing systems with a value of 3.14. In all samples, on increasing the distance of straps from each other, shear strength increased and shear strength of the wall with bilateral bracing system was 60 % greater than that with lateral bracing system.

An Investigation on Sheeting Acting as a Diaphragm on a Reinforced Precast Concrete Frame

“…The experimental program intends to present the problems that emerge in fastening the corrugated sheets (Fig. 1) to the precast reinforced concrete structure and to determine the behavior of the corrugated steel sheets attached on both sides of the frame [11][12].…”

Risk managment in LSF structures (identifying, assessment, responding)

“…New research on the seismic behavior of LSF structures shows that the use of these structures in regions with intense seismicity improves seismic behavior [9].…”

Numerical Modelling of CFS Three-Story Strap-Braced Building under Shaking-Table Excitations

“…Although high performances and advantages of LWS constructions are now worldwide recognized, high-fidelity modelling tools easy-to-use for engineers have not been amply studied and widespread. Commonly, in the state of the art only the main lateral force resisting system (LFRS), i.e., strap-braced wall, is considered and two modelling approaches are employed: (i) A simplified approach in which the nonlinear behavior of steel straps is represented by a spring or a truss element [27][28][29][30]; (ii) detailed FE model using shell or frame elements [31][32][33][34] concerning different geometrical and material details. In the literature, few cases of CFS strap-braced wall buildings have been modelled [35][36][37], but there is no case in which experimentally tested buildings have been modelled and numerical results have been compared with experimental results.…”