Behavior of Anchored Carbon Fiber-Reinforced Polymer Strips Used for Strengthening Concrete Structures

Achintha³

et al. 2019

J. Compos. Constr.

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This paper presents a novel design concept for fiber reinforced polymer (FRP) composites consisting of three-dimensional (3D) printed cores and FRP helical skins as a means of ensuring adequate ductility, compared to the brittle FRP systems conventionally used for internal reinforcement. The experiment demonstrated that when the FRP skins were loaded in tension, the core-which was 3D printed using acrylonitrile butadiene styrene or polylactic acid-was gradually compressed, thereby leading to plastic deformation. This behavior ensured a nonlinear load response while eliminating the unfavorable brittle failure of the FRPs. The results also indicated that the proposed FRP composite system ensured that no premature debonding/delamination occurred between the skin-skin and skin-core. The results of the parametric experimental study indicated that design parameters such as the FRP amount, core height, core span, core shell thickness, core material, core brace, and core number (i.e., the number of inner cores used for the composite) may be optimized to realize the expected design load capacity and ductility.

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Ductile FRP System for Concrete Reinforcement: Concept and Experimental Characterization

Sun¹,

Achintha³

et al. 2019

J. Compos. Constr.

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“…Light, strong and non-corrosion FRP composites [1][2][3][4] offer a quick method for externally strengthening concrete structures. However, a premature FRP debonding from concrete substrate greatly compromises the high-strength merit of FRP material [5]. Various anchors have been therefore developed to make fuller use of externally bonded (EB) FRP sheets by preventing the premature debonding failure.…”

Section: Introductionmentioning

confidence: 99%

An effective improvement for enhancing the strength and feasibility of FRP spike anchors

Sun

Zhang

2020

Composite Structures

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Spike anchors are promising remedies to prevent the debonding failure of FRP sheets. The performance of anchored FRP sheets largely depends on critical parameters such as the extending bond length of FRP sheet over the embedded spike and bend radius, greatly limiting their efficiency and feasibility in field. Moreover, their long-term performance dealing with possible bond loss is still unknown. Recently, an anchorage system consisting of a spike anchor and two patches has been developed. This anchorage system was expected to have several advantages over conventional spike anchors, which were rarely explored but are presented in this paper. A total of 21 experiments have been conducted to demonstrate their merits in terms of higher anchor strengths and minimizing the impacts of the extending bond length over the embedded spike, bend radius and FRP-concrete bond. Experimental results also suggest a great remedy to further improve the anchor efficiency by reducing the fanning angle. Thus, the proposed system could be considered as an efficient and feasible anchorage for FRP sheets.

“…Because of their light-weight, high-strength and non-corrosion properties, Fiber Reinforced Polymer (FRP) composites are remarkable materials to strengthen or reinforce concrete structures [1][2][3][4][5][6][7][8][9]. The successful usage of FRP composites to replace steel reinforcements also suggests an over $8 billion annual savings from repairing the corroded components of U.S. bridges [10,11].…”

Section: Introductionmentioning

confidence: 99%

Modelling of a novel strong and ductile FRP composite

Sun

Construction and Building Materials

Pan

et al. 2019

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