Experimental-numerical study on composite concrete shear wall with encased web steel plate

Abstract

Abstract Composite shear wall isone of the most desirable structural systems in high seismic regions due to high seismic efficiency that encourages structural designers to use this system in high rise buildings. The most of the previous research essentially investigates composite steel plate shear walls reinforced with steel chords at the boundary elements, while little information is available about concrete shear walls with composite (encased) web using steel plate and confined boundary elements conforming with ACI318-19 provisions. In the current study, composite shear walls with web steel plate (encased) (CSW-WSP) confined with dense stirrups at the boundary elements are assessed using experimental and numerical methods. Using different lengths of steel plates, two CSW-WSPs reinforced with confined boundary elements were tested, and a finite element model (FE) was presented and calibrated with the experimental tests. In addition, 45 FE models were analyzed to study the influence of the axial load ratio, reinforcement and steel plate ratios, confinement level, and aspect ratio on the lateral response. Moreover, the lateral shear strength capacity is assessed and a simple relationship has suggested to predict the lateral drift capacity of CSW-WSPs. The results show that the CSW-WSPs with confined boundary element display a stable hysteresis lateral response and high energy dissipation with no strength degradation until 2.5 % drift ratio and can be a candidate for seismic force-resisting systems listed in ASCE7-22 as “Steel and concrete composite special shear walls”.