Abstract
This research investigates the flexural behavior of concrete beams hybridly reinforced by continuous basalt fiber-reinforced polymer (BFRP) bars and discrete steel fibers. Eleven steel fiber reinforced concrete (SFRC) beams reinforced with BFRP bars were tested under four-point bending. The main test parameters included steel fiber volume ratio, SFRC layer thickness, and BFRP reinforcement ratio. The failure modes, load–deflection behavior, crack initiation and propagation, service load and ultimate load of the beams were studied. The results revealed that steel fibers could significantly restrain the deflections and crack propagation of the beams. The beam with a SFRC layer of 57% of its depth obtained similar behavior as its counterpart of a full-depth SFRC beam. Increasing fiber volume ratio improved both service load and ultimate load of the beams but had a greater impact on the former. Increasing BFRP reinforcement ratio significantly improved structural behavior of the beams but only had a marginal impact on the ultimate strength of over-reinforced beams. Based on the model of ACI440.1R-15, a new and improved analytical model which can consider the contribution of steel fibers in BFRP bar-reinforced SFRC beams was proposed for flexural design of beams which agreed better with experimental results than the ACI440.1R-15 model.
Published Version
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