개구부가 설치된 철근콘크리트 깊은 보의 전단거동에 대한 개구부 보강근 배근방법의 영향

초록

The objective of this study was to evaluate the shear capacity of opening reinforcement in reinforced concrete deep beams with rectangular openings. Main variables were shear span-to-overall depth ratio(a/h), and the configuration of opening reinforcement. The size of opening was 0.5a×0.3h and the location of centerlines of openings and shear spans were the same for all specimens. Opening reinforcement identically consisted of three 10 mm diameter deformed bar of 4,000kgf/cm2 yield strength. The vertical reinforcement was U-typed stirrups in top and bottom of opening. The horizontal and 45 degree diagonal reinforcements were arranged in both sides of the beams and anchored according to KCI code method. In the following, the performance of opening reinforcement was described according to the variety of configuration of reinforcement and a/h. Based on previous and this experiments, an equation estimating the shear capacity of opening reinforcement was suggested through considering the average tie-action and the equilibrium of energy of opening reinforcement along the fracture surface in deep beams with openings.

키워드