عنوان مقاله [English]
The use of steel plate shear walls (SPSW), as an efficient lateral seismic resistant system for buildings, has recently received much attention, both in new and rehabilitated structures of concrete and steel. Shear panels play an important role in improving the seismic behavior of structures. They generally occur as unstiffened or stiffened steel plate shear walls. This paper focuses
on stiffened steel plate shear walls and endeavors to investigate the shear behavior of this kind of panel as there are many theoretical and experimental studies on these systems without stiffeners, for which different analytical methods have been presented, and are mostly applicable to very thin steel plate shear walls, and also, as there is no simple mathematical equation which correlates the amount of increase in shear strength and stiffness of stiffened panels with the number of stiffeners. In order to achieve this purpose, the shear capacity (strength) and stiffness of stiffened shear wall panels have been studied with the aid of a series of finite element analyses under different stiffener configurations, including horizontal and vertical stiffeners and a combination of both, using ANSYS. The aim of the present numerical research is to study the effect of stiffening upon the ultimate shear strength and stiffness of stiffened shear panels; finally, to find a mathematical relationship (if any) between the increase of strength and stiffness of the wall and the number of vertical and horizontal stiffeners used. At the beginning, the unstiffened panel was modeled, by comparing the results of the analysis with the related classical equations and experimental tests. Having calibrated the errors, the process of stiffening went on for up to four vertical and horizontal stiffeners, and, finally, the corresponding equations for the percentage of increase in strength and stiffness of the panels were obtained. Consequently, a domain of the number of stiffeners was introduced, and the addition of more stiffeners to the upper boundary of the proposed domain did not have considerable effect on the increase in strength and stiffness. Ultimately, the validity of the proposed equations was examined by some re-modeling within that a related domain was introduced, and the results confirmed the proposed equations in a very favorable manner.