Interface Shear Transfer Behavior of Basalt Fiber Reinforced Polymer (BFRP) in Reinforced Concrete (RC) using the Push-off Test

Abstract

Most of the research related to interface shear transfer in concrete elements has utilized steel bars as reinforcement across the shear plane, while fiber-reinforced polymer (FRP) reinforcement has received little to no attention experimentally and analytically. For this reason, only a few design specifi-cations include provisions for the calculation of the interface shear transfer when using glass fiber-reinforced polymer (GFRP) and none known to the authors using basalt fiber-reinforced polymer (BFRP). In this project, an experimental campaign is being conducted to determine the contribution of GFRP bars to the mechanism of shear transfer by using push-off specimens. The research explores the shear transfer mechanism by employing BFRP reinforcement within concrete via a push-off test. Variances in bar size and the quantity of reinforcement bars are examined in this work to determine their effects. Both cracked and uncracked push-off tests are undertaken to better understand the variation in behavior for uncracked and cracked shear friction transfer. A comparative analysis is conducted, contrasting these findings with research being conducted focusing on steel and GFRP bars in similar evaluation. The results of this investigation demonstrate the contribution of BFRP bars in direct shear transfer in addition to the concrete shear friction contribution. The obtained results indicate that the use of BFRP reinforcement significantly enhances the interface shear strength, resulting in a capacity that exceeds those of the specimens without reinforcement. When the BFRP-reinforced specimen reaches the first crack at a load similar to that of the unreinforced specimens, it continues carrying load until it reaches a peak, thus indicating that the reinforcement is providing both dowel action and clamping force prior the shear failure. Additionally, once the peak strength is reached, the use of GFRP reinforcement allows the spe-cimen to deform in a pseudo-ductile fashion thus preventing sudden failure.

Department(s)

Civil, Architectural and Environmental Engineering

International Standard Book Number (ISBN)

978-103278010-2;978-104059262-5

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Taylor and Francis Group; Taylor and Francis, All rights reserved.

Publication Date

01 Jan 2025

Link to Full Text

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