عنوان مقاله [English]
During the recent past decade, semi-supported steel shear walls (SSSW) have been introduced as an alternative to the traditional type of steel plate shear walls (SPSW). In this system, the shear wall does not connect directly to the main columns of the building frame; instead, it is connected to a pair of secondary columns that do not carry gravity loads. However, a SSSW system,
compared to the corresponding SPSW system in which the infill plate is connected to the main frame columns, has a lower span width (or lower infill plate width) and, thus, lower strength, stiffness and energy dissipation capability. To offset these effects, one effective and practical approach is the use of fiber-reinforced-polymers (GFRPs) for strengthening the steel infill plate. GFRP laminates can be easily attached to one or both sides of the infill plates by the use of adhesive. In this paper, the behavior of semi-supported steel shear walls reinforced by glass-fiber-reinforced-polymers (GFRPs) is studied using the finite-element method and compared with the corresponding systems without the reinforcement. A number of semi-supported steel shear walls with different plate aspect ratios, plate thicknesses, secondary column profiles, and with and without opening of various sizes is considered for this research. Both pushover and cyclic analyses are performed. The adequacy of the finite-element modeling approach for representing the pushover and cyclic responses of SPSWs is verified through comparisons with experimental results. Results show that the use of GFRP laminates, especially for the system with thinner infill plate thickness, can significantly increase the system strength, initial stiffness, and energy dissipation, while it partially decreases the system ductility. In turn, the improvement of the system strength and energy dissipation capability is mainly due to the improvement of the SSSW infill plate behavior. In fact, the use of GFRP laminates does not affect much the hysteresis and pushover behavior of the SSSW frames.