Evaluation and improvement of the behavior of steel plate shear walls using steel-concrete stiffeners

Document Type : Original Research

Authors
H. Zarrintala 1
A. maleki 2
M. Lotfollahi-Yaghin 3
1 Ph.D Student at Islamic Azad University, Maragheh Branch, Maragheh, Iran
2 Assistant Professor at Department of Civil Engineering, Maragheh Branch, Islamic Azad University, Maragheh, Iran
3 Professor at Civil Engineering Department of Tabriz University, Tabriz, Iran
10.22034/25.1.71
Abstract
Abstract

Steel shear walls have been used in various buildings as a system to resist lateral loads. The special advantage of this type of wall is its good malleability, high initial hardness, and high energy consumption power. But due to its special geometry, the steel shear wall undergoes buckling in the elastic range. To prevent steel sheet buckling in steel shear walls, there are two general solutions: using metal stiffeners or using concrete cover that is connected to steel sheet through shears. Based on this research, a solution has been proposed to improve the seismic performance of modern steel-concrete composite shear walls. The composite steel shear wall is a modern lateral bearing system consisting of a steel sheet with a reinforced concrete cover, which is connected to the sheet from one side or both sides by clips. In the composite steel shear wall, the reinforced concrete cover, by restraining the steel sheet and preventing its buckling, increases the shear capacity of the steel shear wall to the point of yielding in shearing inside the plate instead of tension in the direction of the tensile field. The composite steel shear wall, while increasing the shear capacity of the system, increases the resistance of the panel against destructive factors such as corrosion, fire, impact, explosion, and other cases and causes a reduction of more than 25 to 50 percent in the consumption of steel in medium and large buildings. In the new composite steel shear wall system, a distance is created between the concrete cover and the boundary beams and columns. Tests on conventional and modern composite steel shear walls show that the modern system has little damage compared to the conventional system. From nonlinear static analysis using the finite element method and with the help of ABAQUS software, the influence of the geometric characteristics of steel stiffeners on the seismic performance of the modern steel-concrete composite shear wall has been investigated. After modeling the steel-concrete composite shear wall and validating the numerical model with laboratory results, the effect of parameters such as the number of stiffeners, the type of arrangement, including vertical, horizontal, diagonal, and combined, on the maximum bearing capacity of the composite shear wall, ductility coefficient, additional strength, energy consumption, compressive damage of the concrete hardener, and failure modes have been investigated. The results of this research show that the use of T-shaped steel stiffeners and their arrangement have a significant effect on the bearing capacity of steel-concrete composite shear walls and cause the overall buckling of the steel sheet to become local buckling between the stiffeners. The use of diagonal stiffeners increases the capacity of steel shear walls by 25%. The ductility factor and added strength factor of the steel frame with diagonal stiffeners are about 39 and 124% higher than the ductility factor and added strength factor of the base sample without the use of stiffeners, respectively. The use of diagonal stiffeners in composite shear walls compared to composite shear walls without steel stiffeners increases energy consumption by about 18%. The use of T-shaped steel diagonal stiffeners in composite shear walls compared to composite shear walls without steel stiffeners causes a significant reduction in the damage and failure of the concrete stiffener.

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Modares Civil Engineering journal
Volume 25, Issue 1 - Serial Number 81
March and April 2025
Pages 71-85