Abstract
This paper addresses the effects of hooked-end steel fibre contents on the mechanical properties of high-performance concrete (HPC) and investigates the feasibility of utilizing steel fibres to simplify the complicated reinforcement detailing of critical HPC members under high shear stress. Mechanical properties of HPCs with specified compressive strength of 60 and 100 MPa include the flow, air content, compressive strength, and flexural strength. The effectiveness of 1.50% steel fibre content on the shear behaviour of diagonally reinforced concrete coupling beam without additional transverse reinforcement was investigated to alleviate complex reinforcing details for the full section confinement of diagonal bar groups. The test results revealed the incorporation of steel fibres significantly affected the mechanical properties of the HPCs. For diagonally reinforced coupling beam (SFRCCB) without additional transverse reinforcement, the addition of 1.5% steel fibre content into 60 MPa HPC coupling beam provides similar cracking and structural behaviours compared to those of diagonally reinforced coupling beam (CCB) with full section confinement details. However, the ductility of SFRCCB was less than that of CCB. It is recommended that both stirrups and steel fibre should be used for fully confining the diagonal bar groups of coupling beams to achieve the ductile behaviour.
Highlights
Steel fibrous concrete is a composite material that contains randomly distributed steel fibres in the conventional concrete with the brittle nature
Based on the test results of high-performance steel fibre reinforced concrete (HP-Science //dx.doi.org/10.1155/2015/850562 fibre reinforced concrete (SFRC)) prismatic specimens, conventional concrete, and HP-SFRC short coupling beams with diagonal reinforcements, the following conclusions can be drawn: (1) For all HP-SFRC mixtures mixed in this study, there was no problem in mixing and casting up to hookedend steel fibre volume fraction of 1.5%
The addition of 1.5% steel fibres to the 60MPa and 100MPa high-performance concrete (HPC) caused a maximum increase of 42.3% and 30.0% compared with the modulus of rupture of HPC without steel fibres, respectively
Summary
Steel fibrous concrete is a composite material that contains randomly distributed steel fibres in the conventional concrete with the brittle nature. Jain and Singh [18] investigated the validity of flexural performance criteria in the SFRC recommended in the ACI 318-08 for replacing minimum shear reinforcement with deformed steel fibres They reported that an allowable shear stress value of 0.3√ MPa is for being reinforced with the deformed steel fibres instead of transverse reinforcement in the NSC and HSC beams. The use of hooked-end steel fibres as replacement of transverse reinforcement in the short coupling beam with diagonal reinforcement is investigated in an attempt to simplify the placement of reinforcing bars and reduce congestion without sacrificing shear strength, ductility, and energy absorption capacity under reversed cyclic loading. The influence of steel fibres on the mechanical properties of high-performance concretes (HPCs) with specific compressive strengths of 60 and 100MPa was investigated in this study.
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