Flexural behavior of concrete beams with steel bar and FRP reinforcement

Seongeun Kim,Seunghun Kim

doi:10.1080/13467581.2019.1596814

Seongeun Kim, Seunghun Kim

Open Access

https://doi.org/10.1080/13467581.2019.1596814

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Abstract

ABSTRACT The purpose of this paper is to investigate the flexural behaviour of concrete beams with deformed steel bars and FRP bars for reinforcement. From experimental and analytical works, stiffness, crack, strength, and deflection behaviour was analysed and compared with ACI318 and ACI440. There were six specimens, which were tested by the variables of reinforcement combination (steel-steel, steel-GFRP, steel-CFRP) and concrete strength (40 MPa, 60 MPa). Test results showed that specimens with steel-FRP reinforcements had two times higher strength than the specimens with steel-steel reinforcements and that deflection of specimens was similar. Nominal flexural strengths of specimens by ACI318 and ACI440 were 113 ~ 142% of flexural strengths by the test. From finite element analysis, the reliability of the analysis was demonstrated by comparison between appropriate analysis model and test results.

Highlights

Reinforced concrete structures, which are considered as products of industrial development, integrate concrete and steel bars in constructing building structures
The purpose of this paper is to investigate the flexural behaviour of concrete beams with deformed steel bars and FRP bars for reinforcement
The following conclusions have been drawn from the flexural experiment for the concrete beam with hybrid FRP-steel reinforcement, where the type of flexural reinforcement and concrete strength were used as the experimental variables

Summary

Introduction

Reinforced concrete structures, which are considered as products of industrial development, integrate concrete and steel bars in constructing building structures. The reinforced concrete has replaced traditional structural materials such as wood and steel because the steel reinforcing helps to resist external force (tensile stress). It has many advantages including durability, constructability, and economic feasibility. In order to improve the performance of a reinforced concrete structure, many studies have focused on using various materials for repair and reinforcement. Within this context, some studies attempted to apply FRP (fiber reinforced plastic) bars to reinforce concrete structures. Japan (JSCE 1997) and Canada (CAN/CSA S806-02 2002), have established design procedures for the use of FRP reinforcement for concrete structures

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