Shear Capacity of Lightweight Concrete Beam Reinforced with Glass Fiber-Reinforced Polymer Bars
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RESEARCH PAPER
Shear Capacity of Lightweight Concrete Beam Reinforced with Glass Fiber‑Reinforced Polymer Bars Habib Akbarzadeh Bengar1 · Fatemeh Ahmadi Zarrinkolaei2 · Mohsen Bozorgnasab1 Received: 17 December 2019 / Accepted: 15 August 2020 © Shiraz University 2020
Abstract In this article, the shear behavior of lightweight concrete beams reinforced with glass fiber-reinforced polymer (GFRP) bars is examined. Here, in order to investigate the effect of bar type on the shear strength, the GFRP bar was used as the longitudinal bar. In total, eight concrete beams with a span length of 2 m and section dimensions of 150 × 250 mm without transverse reinforcement were tested. The parameters under study included the concrete type (lightweight and conventional), shear spans-to-depth ratio ( da ) (2.5 and 4), bar type (steel and GFRP), and diameter of the longitudinal bars (12 and 16 mm). The results of the tests showed that the failure of the beams under study was of the shear type, as expected. With an increase in the da ratio, the shear strength decreased, and more flexural cracks were observed. The shear strength of the lightweight concrete beams was obtained lower than that of the corresponding conventional concrete beams. The beams reinforced with the steel bars demonstrated a higher stiffness relative to the ones reinforced with the GFRP bars. Furthermore, the shear strength results obtained from the tests were compared with those predicted by equations proposed by several codes as well as studies in the literature. The comparison showed good consistency of the experimental results with those predicted by the Canadian code. Keywords RC beams · Shear strength · Lightweight concrete · GFRP
1 Introduction A significant challenge faced by structural designers is issues associated with the heavy weight or dead load of a reinforced concrete structure. One of the main approaches to address this problem is the use of lightweight concrete. Structural lightweight concretes have a compressive strength above 17 MPa despite having a density of less than 2000 kg/m3. The manufacture of these concretes is only possible through the use of lightweight and strong aggregate. The maximum strength of lightweight aggregate concrete is accomplished * Habib Akbarzadeh Bengar [email protected] Fatemeh Ahmadi Zarrinkolaei [email protected] Mohsen Bozorgnasab [email protected] 1
Department of Civil Engineering, University of Mazandaran, Babolsar, Iran
Department of Civil Engineering, Mazandaran University of Science and Technology, Babol, Iran
2
when lightweight aggregate with a strength greater than or equal to that of the concrete matrix is used for lightweight construction (Chung et al. 2018; Naseri et al. 2019; Real et al. 2017; Yazdani and Goucher 2015). The application of lightweight concrete in structural elements and systems leads to a lower cost of the foundation and structure, and it also provides a better thermal and sound insulation compared with concrete with normal density. The applicability of
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