Shear strength and behavior of circular concrete members reinforced with FRP bars and spirals

In the last decade, the use of fiber reinforced polymer (FRP) materials has been growing to increase the anticipated service life of reinforced concrete (RC) structures, such as bridges, parking garages, tunnels, and marine structures. Recently, the use of FRP bars in soft-eyes, which are openings in retaining walls that will be pierced by tunnel boring machines (TBMs), is gaining popularity in the field of tunnel excavation. In this research study, an experimental program was designed to investigate the shear behavior of circular members reinforced with glass FRP (GFRP) and carbon FRP (CFRP) bars, and spirals. A total of twenty full-scale circular RC specimens, with a total length 3,000 mm and 500 mm in diameter, were fabricated and tested experimentally under shear load. The main objective of testing these specimens is to investigate the behavior of circular concrete members reinforced with GFRP or CFRP longitudinal bars and transverse spirals reinforcement. Several parameters have been studied; type of reinforcement, longitudinal reinforcement ratio, shear reinforcement ratio (spiral diameter and spacing), and shear-span-to-depth ratio. In addition, an analytical investigation was conducted to evaluate the validity and accuracy of available FRP shear design equations in codes and design guidelines, and to determine whether certain modifications should be introduced in order to make them suitable for circular concrete members reinforced with FRP bars and spirals. Based on the finding of this investigation, the shear capacity of FRP-RC members with circular sections may be determined with the approaches developed for rectangular sections provided that certain modifications are made to take into account the effective shear depth, equivalent breadth, the mechanical properties and geometry of GFRP or CFRP spirals.


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Filing Info

  • Accession Number: 01607823
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 22 2016 10:18AM