콘크리트에 매립된 소형 ㄱ형강의 부착강도 평가
Evaluation on the Bond Strength of Angle Embedded in Concrete
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초록
본 연구에서는 콘크리트 압축강도 변화에 따른 소형 ㄱ형강에 대한 부착강도를 평가하는 것을 목적으로 푸쉬아웃실험 실시하였다. 실험변수는 ㄱ형강의 종류, 피복두께, 부착길이, 콘크리트 압축강도 등으로 계획하였다. 실험 결과로부터 최종 파괴형상은 미끄러짐 파괴, 국부 쪼갬 균열 후 미끄러짐 파괴, 쪼갬 파괴 등 세 가지 형태로 나타났다. 부착면적이 증가할수록 F1 계열 및 F2 계열 실험체의 최대 하중을 증가했으나 실험 부착응력은 다소 감소하는 경향이 나타났다. 또한 피복두께 1.25∼1.5배 증가함에 따라 평균 부착응력이 약 9.4∼21.0% 증가하였다. F1 계열 실험체(fck: 31.4 MPa)의 평균 부착응력은 1.14 MPa, 표준편차 0.25 MPa이며, F2 계열 실험체(fck: 47.7 MPa)의 평균 부착응력은1.33 MPa, 표준편차 0.29 MPa로 평가되었다. 콘크리트 압축강도 약 51.9% 증가할 때, 평균 부착응력이 약 16.7% 증가하였다. 본 연구에서는 피복두께, 콘크리트 압축강도, 부착길이 등을 변수로 한 제한된 실험 결과를 바탕으로 콘크리트 압축강도 제곱근과 부착응력 계수(0.1)의 곱으로구성된 부착강도식을 제안하였다.
Abstract
This study aimed to evaluate the bond strength of small L-shaped steel angles under varying concrete compressive strengths by conducting push-out tests. Specimen’s variables such as the type of angle, cover thickness, bond length, and concrete compressive strength were considered. The experimental results revealed three failure patterns: splitting failure, splitting crack and slip failure, and slip failure. As the bond area increased, the maximum load of specimens increased, but the experimental bond stress showed a slight decreasing trend. Additionally, when the cover thickness increased by 1.25 to 1.5 times, the average bond stress increased by approximately 9.4–21.0%. The average bond stress of the F1 series specimens (fck=31.4 MPa) was 1.14 MPa, with a standard deviation of 0.25 MPa, while that of the F2 series specimens (fck=47.7 MPa) was 1.33 MPa, with a standard deviation of 0.29 MPa. When the concrete compressive strength increased by approximately 51.9%, the average bond stress increased by about 16.7%. Based on the limited experimental results considering variables such as cover thickness, concrete compressive strength, and bond length, this study proposed a bond strength proposed equation consisting of the square root of the concrete compressive strength and a bond stress coefficient(0.1).
참고문헌 (10)
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