Effect of shear stirrup space on short link beam of eccentric braced frame (EBF) V-type under cyclic loading

Abstract

Some previous research indicated that a short link beam in an Eccentric Braced Frame (EBF) yields due to shear rather than flexure. Stirrups inside a concrete beam structure are functioned to carry shear forces beside concrete material itself. It means that the effect of spacing between shear stirrups is a very important aspect in increasing a short link beam structural capacity. Present study used EBF with brace V-type (EBF-V) due to its good performance compared to diagonal and inverted-V. Seven reinforced concrete braced frame structures consist of one EBF-V with short link stirrup space of 150 mm, three EBF-V with short link stirrup space of 75 mm and three Concentric Braced Frame V-type (CBF-V) as control models. Under cyclic loading conditions, load-displacement relationship and crack positions were observed. Results indicated that CBF-V models have the highest maximum load. On the other hand, EBF-V has a larger displacement than CBF-V. Smaller stirrup space results in a slightly higher strength but lower ductility. Crack visualizations of CBF-V and EBF-V model are also presented.