일반 철근 배근 상세를 갖는 강섬유 보강 콘크리트 연결보의 전단강도 평가
Shear Strength Evaluation of Steel Fiber Reinforced Concrete Coupling Beams with Conventional Reinforcements Details
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초록
본 연구의 목적은 기존 연결보의 사인장 파괴를 방지하고 연결보의 전단강도를 증가시키며 증가분을 정량적으로 평가하는 것이다. 강섬유는 전단강도를 향상시키고 파괴 메커니즘을 부분적으로 변화시킬 수 있지만 이는 일반적인 RC보와 기둥에 대한 연구결과이며, 강섬유보강콘크리트에 대한 연결보의 전단강도 증진에 대한 연구는 아직까지 부족한 실정이다. 따라서, 강섬유에 의한 증가된 전단강도와 이에 따른파괴 메커니즘 변화를 확인하기 위해 강섬유의 혼입률을 변수(0%, 1%, 2%)로 세 개의 실험체를 제작하여 반복가력 실험을 수행하였다. 그 결과, 강섬유를 보강한 실험체(1%, 2%)가 그렇지 않은 실험체(0%) 대비 최대강도 발현 후 콘크리트의 전단저항 기여분이 증가됨에 따라 전단강도가 증진되었다.
Abstract
The purpose of this study is to prevent diagonal tension failure of existing conventional coupling beams, increase the shear strength ofconventional coupling beams, and quantitatively evaluate the increase. Steel fibers can improve shear strength and partially change the failuremechanism, but this is the result of research on general RC beams and columns, and research on the shear strength enhancement of conventional couplingbeams for steel fiber reinforced concrete is still lacking. Therefore, in order to confirm the increased shear strength caused by steel fiber and the resultingchange in failure mechanism, three specimens were fabricated with the steel fiber volume fraction as a variable (0%, 1%, 2%) and repeated loadingexperiments were performed. As a result, the shear strength of the specimens reinforced with steel fibers (1%, 2%) increased as the shear resistancecontribution of concrete increased after the maximum strength was developed compared to the specimens without it (0%).
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