높은마디면적 철근의 부착성능
Bond Strength of High Relative Rib Area Reinforcing bars
높은마디면적 철근 부착성능;
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The effects of deformation properties on the bond of steel reinforcing bars to concrete are experimentally studies to expect the bond strength. Based on the previous research about high relative rib area, bond strength between reinforcing bars and concrete can be improved by the control of rib height and spacing. But, the equations in Korean code provisions to predict development and splice length do not include these specifications of reinforcing bars. So, the purpose of this paper is to determine the effect of relative rib area to the bond strength. This paper describes 2 kinds of experimental researches. 30 beam-end specimens are tested to investigate the effects of bar size and relative rib areas ranging from 0.112 to 0.162. And, 12 lap-splice beam specimens are tested to the same variables. Each test results are normalized and compared with the proposed equations of ACI 408 committee. The results show that bond strength is increased as bar size and the relative rib area(R_(r)) increase. And, the distribution of flexural cracks and failure aspect do not appear to be affected by R_(r). The test results are also analyzed to make a design formula about the calculation of development length on the consideration of relative rib area.