Design-Oriented Stress-Strain Model for FRP-Confined Lightweight Aggregate Concrete
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0233-9
Structural Engineering
Design-Oriented Stress-Strain Model for FRP-Confined Lightweight Aggregate Concrete Hooshang Dabbagha, Maysam Delshada, and Kasra Amoorezaeia a
Dept. of Civil Engineering, University of Kurdistan, Sanandaj 66177-15175, Iran
ARTICLE HISTORY
ABSTRACT
Received 17 February 2020 Revised 8 July 2020 Accepted 6 August 2020 Published Online 30 October 2020
Despite the advantages of lightweight aggregate concrete (LWAC), its brittleness in compression has limited its vast application. Jacketing by fiber-reinforced polymer (FRP) tends to be one method to overcome this negative point. The current study attempted to recognize the FRP confinement impact on the LWAC compressive monotonic behavior. Both fine and coarse aggregates were Scoria aggregate. The variables include the type and number of FRP layers; 150 × 300 mm cylindrical specimens were wrapped with 1, 2, 3, and 4 layers of glass FRP (GFRP) and carbon FRP (CFRP) strips. An investigation was performed on the monotonic stress-strain curve belonging to LWAC confined with FRP, and key points, including ultimate stress and strain on the curve, were explored. The results revealed that the key points would significantly improve by increasing FRP layers. Although the influence of GFRP confinement on enhancing the ultimate strain appears to be more considerable than the CFRP confinement, CFRP jacketing of LWAC upgrades the ultimate strength to the higher level compared to wrapping with GFRP. Based on the interpretation of experimental results, a design-oriented stress-strain model was established to predict the monotonic compressive response of Scoria-LWAC circular specimens confined with CFRP and GFRP. The validity of the model was examined. The predicted output was appropriately in line with the experimental findings.
KEYWORDS CFRP GFRP Lightweight concrete Compressive behavior Stress-strain model
1. Introduction Over the past two decades, lightweight concrete made up of various types of aggregates, including natural (such as pumice, cinders, scoria, volcanic, diatomite, and tuff) and artificial (such as those produced by the use of heat in order to extend perlite, clay, obsidian, slate, shale, and vermiculite, and those created by the use of cooling processes that result in an expansion of blastfurnace slag), has been extensively investigated; it has also been applied in constructing large-span concrete structures, high-rise buildings and so on (Kong and Evans, 1983; JGJ12, 2006; Sohel et al., 2012; Wang and Wang, 2013; Huang et al., 2015; Zhou et al., 2016b). Lightweight aggregate concrete (LWAC) has a number of advantages, including high strength/weight ratio, saving dead loads for foundations, and preferable fire resistance. Therefore, potential applications of LWAC in the construction industry cannot be ignored. Besides, disadvantages, including the low-grade deformation capacity and brittleness of LWAC CORRESPONDENCE Hooshang Dabbagh ⓒ 2020 Korean Socie
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