Investigation of Shear Reinforcement Schemes for RC Deep Beams
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RESEARCH ARTICLE-CIVIL ENGINEERING
Investigation of Shear Reinforcement Schemes for RC Deep Beams Aref A. Abadel1 · Abdulrahman S. Albidah1 Received: 19 August 2020 / Accepted: 5 November 2020 © King Fahd University of Petroleum & Minerals 2021
Abstract The aim of this paper is to experimentally investigate the effect of using alternative shear reinforcement schemes on the shear performance of deep beams. Seven deep beams were cast with different shear reinforcement configurations. Three deep beam samples were used as reference and were cast with (1) plain concrete without stirrups, (2) plain concrete with stirrups and (3) steel fiber reinforced concrete without stirrups. The remaining beams were made using two alternative shear reinforcement schemes including inverted U-shape steel angles of 50 mm × 50 mm × 4 mm and inverted U-shape steel rebars made of 2∅16 mm. For each shear reinforcement scheme, two deep beam samples were tested, one made with plain concrete and the other made with steel fiber reinforced concrete. The results showed that the proposed schemes (inverted U-shape made of angles and steel bars) increased the shear capacity of deep beams by 40.9–75.2% compared to the reference beam without shear reinforcement. In addition to improving the post-peak behavior and ductility, the proposed schemes showed equivalent ultimate shear resistance compared to the reference deep beam made with closely spaced stirrups. The use of steel fiber reinforced concrete in combination with the inverted U-shape angles and steel bars improved the ultimate shear resistance of deep beams and produced a prolonged stable inelastic behavior compared to the reference beam with stirrups. A strut-and-tie model was proposed to predict the shear strength of the deep beams, which showed a strong correlation between the predicted and the experimental results. Keywords Deep beam · Alternative shear reinforcement · Shear capacity · Ductility · Steel fibers
1 Introduction Since the 1980s, with the continuous development in structural engineering, the use of deep beams has increased considerably [1]. This is due to the greater flexural and shear capacity of deep beams compared to regular beams [1–3]. As defined by ACI-319 section 9.9, deep beams must have either clear spans equal to or less than four times the overall member depth, or the regions with concentrated loads are located within twice the member depth from the face of the support [4]. The failure modes in deep beams are typically different from normal beams. In deep beams, shear-type failures are more common than flexural failure [1]. Therefore, increasing the shear capacity of deep beams is one of the commonly implemented methodologies to increase the loading capacity of deep beams [5–7].
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Abdulrahman S. Albidah [email protected] Department of Civil Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
The shear capacity of a deep beam can be increased by several ways, classified into two categories: external or internal strengthening. E
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