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Title |
The Ductile Behavior Test of Ultra High Performance Fiber Reinforced Concrete Rectangular Beam by the Combination of the Fiber and Group of Reinforcing Bars
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Authors |
한상묵(Sang-Mook Han) ; 안진우(Jin-Woo An) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.3.139 |
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Keywords |
섬유보강 콘크리트 ; 초고강도 콘크리트 ; 연성거동 ; 철근 집합체 Fiber reinforced concrete ; Ultra high performance concrete (UHPC) ; Ductile behavior ; Bundle of reinforcing bars |
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Abstract |
The purpose of this paper is to induce the ductile behavior of the UHPFRC member after the peak load by using the bundle of longitudinal reinforcing bar as a substitute for steel fiber. Experiments on the flexural behavior of the Ultra High Performance Concrete rectangular beam with the combination of the steel fiber and longitudinal reinforcing bar were carried out. The volume fractions of steel fiber are 0%, 0.7%, 1%, 1.5%, 2% and the reinforcement ratios of longitudinal reinforcing bar which induce the ductile behavior are 0.0036, 0.016, 0.028 and 0.036. 15 UHPC beams were made with the combination of these test factors. Not only steel fiber but also bundle of longitudinal reinforcing bar has the effect to induce ductile behavior of UHPC structural member. The combination of 0.7% volume fraction of steel fiber and 0.028 reinforcement ratio showed the most economic combination. The relationship of load-deflection, strain variation of the concrete and the crack pattern indicate the usefulness of the bundle of the longitudinal bar which has small diameter with close arrangement each other.
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