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<p>Fiber Reinforced Polymer (FRP) rebars as internal reinforcements in structural elements are often limited by serviceability concerns. This study attempts to improve the serviceability performance of Glass FRP (GFRP) reinforced Engineered Cementitious Composite (ECC) beams. An extensive test program consisting of sixteen medium-scale reinforced ECC beams is conducted. The test variables considered in this work include (a) longitudinal FRP reinforcement ratio (ρ<sub>l</sub> = 1.05% and 2.10%) and (b) bio-fiber type (flax, kenaf, hemp, and pineapple). In addition to the tests, a detailed theoretical study was performed and an improved formulation was proposed to predict the ultimate shear capacity of FRP-reinforced ECC members. Test results revealed that the use of a high GFRP longitudinal ratio (ρ<sub>FRP</sub> = 2.1%) resulted in significant improvement in peak load up to 42.9% due to the combined dowel resistance and crack bridging effect of natural fibers. However, the ductility represented in terms of energy absorption showed a reduction for all fiber types with the increase in GFRP ratio. The predictions obtained from the proposed theoretical approach showed a close correspondence with the shear capacity from tests.</p>

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Effect of GFRP reinforcement ratio on the shear capacity of novel natural fiber-based engineered cementitious composite beams

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • R. Belsiah Darling,
  • M. Chellapandian,
  • T. G. Mondal

摘要

Fiber Reinforced Polymer (FRP) rebars as internal reinforcements in structural elements are often limited by serviceability concerns. This study attempts to improve the serviceability performance of Glass FRP (GFRP) reinforced Engineered Cementitious Composite (ECC) beams. An extensive test program consisting of sixteen medium-scale reinforced ECC beams is conducted. The test variables considered in this work include (a) longitudinal FRP reinforcement ratio (ρl = 1.05% and 2.10%) and (b) bio-fiber type (flax, kenaf, hemp, and pineapple). In addition to the tests, a detailed theoretical study was performed and an improved formulation was proposed to predict the ultimate shear capacity of FRP-reinforced ECC members. Test results revealed that the use of a high GFRP longitudinal ratio (ρFRP = 2.1%) resulted in significant improvement in peak load up to 42.9% due to the combined dowel resistance and crack bridging effect of natural fibers. However, the ductility represented in terms of energy absorption showed a reduction for all fiber types with the increase in GFRP ratio. The predictions obtained from the proposed theoretical approach showed a close correspondence with the shear capacity from tests.