Seismic Behavior of Concrete Members Reinforced with Glass Fibre-Reinforced Polymer (GFRP) Bars: State-of-the Art Review
摘要
Glass fiber-reinforced polymer (GFRP) bars have many advantages over carbon steel including epoxy-coated steel reinforcement for concrete structures, for its high strength-to-weight ratios, corrosion resistance, less laborious production and material handling, among other features. On the other hand, GFRP bars have an elastic load-elongation behaviour up to failure without a yield phase like carbon steel. Due to these properties, the codification of using GFRP bars in earthquake-resistant concrete structures remains under development. Its application is currently limited to non-seismic zones in various design codes. ACI 440.11-22 does not allow the use of GFRP in structural concrete elements that is part of the seismic force-resisting system in Seismic Design Categories (SBCs) B thru F, and in structural concrete elements within SDCs D, E, and F. Recent and current research investigates the adequacy of GFRP bars as reinforcement in structural concrete elements subjected to seismic loading and explores their behavior in potential applications to earthquake-resistant structures. GFRP reinforced concrete (GFRP-RC) elements such as columns, shear walls, slabs and beams were studied. Some strategies involved enhancing ductility by confining concrete or using both steel and GFRP reinforcement simultaneously (hybrid reinforcement). Other studies explore the non-linear composite behavior of GFRP-RC sections rather than considering solely the linear tensile behavior of the GFRP bar. This paper provides an overview of recent studies that investigated the behavior of GFRP-RC elements under cyclic loading and discusses recent developments in related standards and design guidelines.