Abstract：The pull-out experiments were conducted on 12 specimens to investigate the bond property between steel bar and High Ductility Concrete (HDC). The effects of rebar diameter, rebar shape, strength of HDC, thickness of concrete cover and content of fibers on characteristic point of bond stress-slip curves were analyzed. The experimental results show that the HDC specimens shall fail in the pull-out mode or split-pullout mode, since the lateral restraints of fiber bridging stress limits the width of radial cracks in HDC, enhancing the damage resistance of HDC. Compared to the ordinary concrete, the bond strength between HDC and plain round bar can be increased 1.79 times and the residual bond strength can be enhanced 1.96 times. According to the failure modes of specimens, the critical relative cover (c/d) for the combination of HDC and ribbed bars was determined to be 3.41. With the increase of fiber amount, the toughening and fracture resistance can be improved, and the bond toughness indices (I0.85 and I0.5) can be improved by 35 percent and 41 percent, respectively. Based on the experimental results, a calculation formula for calculating the bond strength between HDC and ribbed bars was proposed, and a suitable bond stress-slip constitutive model was established, based on which the predicted curves agreed well with the experimental curves.
邓明科 潘姣姣 梁兴文. 高延性混凝土与钢筋黏结性能的试验研究[J]. 土木工程学报, 2018, 51(3): 19-26.
Deng Mingke Pan Jiaojiao Liang Xingwen. Experimental study on bond behavior between steel bar and high ductility concrete. 土木工程学报, 2018, 51(3): 19-26.
