Experimental Study on Shear Behavior of Steel Fiber Reinforced Concrete Beams with High-Strength Reinforcement.

Jun Zhao,Jingchao Liang,Fuqiang Shen,Liusheng Chu

doi:10.3390/ma11091682

Jun Zhao, Jingchao Liang + Show 2 more

Open Access

https://doi.org/10.3390/ma11091682

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Journal: Materials	Publication Date: Sep 11, 2018
Citations: 42	License type: CC BY 4.0

Affiliation: Zhengzhou University, Kobe University

Abstract

Many researchers have performed experimental and theoretical studies on the shear behavior of steel fiber reinforced concrete (SFRC) beams with conventional reinforcement; few studies involve the shear behavior of SFRC beams with high-strength reinforcement. In this paper, the shear test of eleven beams with high-strength reinforcement was carried out, including eight SFRC beams and three reinforced concrete (RC) beams. The load-deflection curve, concrete strain, stirrup strain, diagonal crack width, failure mode and shear bearing capacity of the beams were investigated. The test results show that steel fiber increases the stiffness, ultimate load and failure deformation of the beams, but the increase effect of steel fiber decreases with the increase of stirrup ratio. After the diagonal crack appears, steel fiber reduces the concrete strains of the diagonal section, stirrup strains and diagonal crack width. In addition, steel fiber reduces crack height and increases crack number. Finally, the experimental values of the shear capacities were compared with the values calculated by CECS38:2004 and ACI544.4R, and the equation of shear capacity in CECS38:2004 was modified to effectively predict the shear capacities of SFRC beams with high-strength reinforcement.

Highlights

With the increase of large-scale structures such as high-rise buildings and large-span bridges, the requirements for the strength and performance of materials have become higher and higher.For steel bars, the high-strength reinforcement with high strength, great corrosion resistance and good ductility is used to replace the conventional reinforcement in concrete structures, which can reduce the total amount of reinforcement and increase the spacing of reinforcement, thereby reducing construction difficulty and ensuring concrete pouring quality [1,2,3].In recent years, many scholars have done large numbers of experimental studies on the shear behavior of beams with high-strength reinforcement
The high-strength reinforcement with high strength, great corrosion resistance and good ductility is used to replace the conventional reinforcement in concrete structures, which can reduce the total amount of reinforcement and increase the spacing of reinforcement, thereby reducing construction difficulty and ensuring concrete pouring quality [1,2,3]
Ding [19], the results show that the shear capacities of steel fiber reinforced concrete (SFRC) beams are 14–18% higher than that of reinforced concrete (RC) beams, and the steel fiber can replace a part of the stirrups

Summary

Introduction

With the increase of large-scale structures such as high-rise buildings and large-span bridges, the requirements for the strength and performance of materials have become higher and higher.For steel bars, the high-strength reinforcement with high strength, great corrosion resistance and good ductility is used to replace the conventional reinforcement in concrete structures, which can reduce the total amount of reinforcement and increase the spacing of reinforcement, thereby reducing construction difficulty and ensuring concrete pouring quality [1,2,3].In recent years, many scholars have done large numbers of experimental studies on the shear behavior of beams with high-strength reinforcement. With the increase of large-scale structures such as high-rise buildings and large-span bridges, the requirements for the strength and performance of materials have become higher and higher. The high-strength reinforcement with high strength, great corrosion resistance and good ductility is used to replace the conventional reinforcement in concrete structures, which can reduce the total amount of reinforcement and increase the spacing of reinforcement, thereby reducing construction difficulty and ensuring concrete pouring quality [1,2,3]. Many scholars have done large numbers of experimental studies on the shear behavior of beams with high-strength reinforcement. Munikrishma et al [4,5] tested the shear behavior of RC beams with high-strength stirrups (yield strength of 690 MPa) and conventional stirrups (yield strength of 413 MPa). When the shear capacities of the beams were approximately equal, the required number of high-strength stirrups was less than that of conventional stirrups.

Methods

Results

Conclusion