City Research Online

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 rate. 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, stirrup enable the full development of the tensile capacity of GFRP bars. The existing equations of shear strength from five design codes and 7 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 are more accurate. The equations by Kwak, Jin and Thiemicke's provide best predictions.

Publication Type:	Article
Additional Information:	This is an open access article under the terms of theCreative Commons Attribution-NonCommercial-NoDerivsLicense, which permits use and distribution in anymedium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.© 2022 The Authors.StructuralConcretepublished by John Wiley & Sons Ltd on behalf of International Federation for Structural Concrete.
Publisher Keywords:	ultra-high-performance concrete; glass fiber reinforced polymer rebar; stirrup ratio; shear span to depth ratio; shear behavior
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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