간접하중을 받는 철근콘크리트 깊은보의 전단거동에 관한 실험적 연구
Experimental Study on Shear Behavior of Reinforced Concrete Deep Beams with Indirect Loading
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이 논문은 교차된 보로부터 간접하중을 받는 철근콘크리트 깊은보의 전단강도 감소에 대한 실험결과를 기술한다. 주요 실험변수는하중전달경로와 하중전달 보의 위치로 계획하였다. 하중전달경로는 직접하중과 간접하중으로 구분된다. 간접하중을 받는 실험체는 철근콘크리트 깊은보와 이에 직교하여 하중을 전달하는 보로 구성된다. 하중전달 보의 위치는 깊은보의 상부와 하부로 나뉜다. 간접하중을 받는 깊은보의 하부에 하중전달 보가 위치한 실험체는 전단보강을 위한 행거보강근을 가지도록 계획하였다. 지지하는 보의 깊이에 대한 전단경간의 비는모든 실험체가 0.7로 동일하다. 실험결과, 간접하중을 받는 실험체는 직접하중을 받는 실험체보다 전단강도가 크게 감소되었으며, 간접하중을전달하는 보의 위치가 내려갈수록 전단강도 감소량이 증가하였다. 또한, 하중전달 보의 위치는 콘크리트 압축대의 분포와 크기, 그리고 인장철근의 변형률에도 영향을 미치는 것으로 실험결과 확인되었다.
Abstract
This paper presents experimental results on the reduction of shear strength in reinforced concrete deep beams subjected to indirect loads from supported beams. The primary experimental variables are the load transfer path and the location of the load-transfer beam. The load transfer path is categorized into direct and indirect loads. The specimens subjected to indirect loads consist of a reinforced concrete deep beam and load-transfer beams that are supported and perpendicular to it. The location of the load-transfer beams is categorized into upper and lower positions of the deep beam. The specimen with load-transfer beams positioned at the bottom was designed to include hanger reinforcement for shear strengthening, aiming to evaluate the effect of the hanger reinforcement. The shear span-to-depth ratio of the supporting beam for all specimens was uniformly 0.7. The experimental results showed that the shear strength of specimens subjected to indirect loads was significantly decreased compared to those subjected to direct loads, with the reduction in shear strength increasing as the position of the load-transfer beam moved lower. Additionally, the position of the load-transfer beams was found to affect the distribution and magnitude of the concrete compression strut as well as the strain in the tension reinforcement.
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