Shear behavior of glass FRP bars‐reinforced ultra‐high performance concrete I‐shaped beams

Abstract

In this paper, the shear behavior of glass fiber reinforced polymer (GFRP) bars reinforced ultra-high-performance concrete (UHPC) beams was investigated through experimental tests. Eight GFRP bars reinforced UHPC I-beams were tested until shear failure with various stirrup ratio, reinforcement ratio, and shear span to depth ratio. The shear capacity, load-deflection relationship, cracking pattern, and failure mode were investigated in detail. The results show that the shear span to depth ratio has the greatest influence on the shear capacity of the beam among the three parameters, followed by the stirrup ratio and reinforcement ratio. The stirrup configuration can significantly improve the shear capacity and deformation resistance of the beam and can effectively reduce the stress concentration caused by the uneven distribution of steel fibers, which affects the failure mode of the beam. Increasing the stirrup ratio and reinforcement rate can improve the stiffness of the beam after cracking, and the larger the shear span to depth ratio is, the more significant the improvement effect is. Moreover, the stirrup enables the full development of the tensile capacity of GFRP bars. The existing equations of shear strength from five design codes and seven literatures are compared to the experimental results of 54 UHPC beams. It showed that the formula from the codes AFGC-2013 and JSCE-2006 codes is more accurate. The equations by Kwak, Jin, and Thiemicke's provide the best predictions.glass fiber reinforced polymer rebar, shear behavior, shear span to depth ratio, stirrup ratio, ultra-high-performance concrete Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

“…In Reference 46, the NSM approach appeared to be more efficient than EBR in enhancing the RC beams' shear capacity, while using anchorage at the rod end highly improved the beam shear capacity. Cao et al 47 investigated the shear behavior of GFRP RC beams. The beams were cast from bar‐reinforced ultra‐high‐performance concrete (UHPC).…”