钢筋与钢纤维混凝土的黏结滑移性能及其关系模型

基于内贴应变片的钢筋与钢纤维混凝土局部黏结试件的拉拔试验，研究钢筋与不同强度钢纤维混凝土的黏结性能。通过对实测钢筋应变的分析，建立了以三次多项式表达的黏结应力分布函数，得到了各级荷载作用下钢筋与钢纤维混凝土黏结应力和相对滑移沿黏结区段的分布，进一步分析了钢纤维和混凝土强度对黏结性能的影响。结果表明，随钢纤维的体积率和混凝土强度的增大，黏结试件加载端附近的黏结应力提高，黏结应力极值总体向加载端靠拢；同时，加载端与自由端的滑移减小。最后，提出了能够较好反映钢筋与钢纤维混凝土受力过程的黏结-滑移关系模型。

Bond-slip behavior and constitutive model between rebar and steel fibre reinforced concrete

The pull-out tests for bonding between rebar with inside strain gauges and steel fibre reinforced concrete (SFRC) were carried out to study the bond properties of specimens with varying concrete strengths. Based on the analysis of measured rebar strain, the distribution function of bond stress performed in cubic smooth spline was established. The distribution of bond stress and relative slip in bonded segment was obtained under the action of load at each stage， and the effects of steel fibre and concrete strength on bond properties were further analyzed. The results indicate that with the increasing of volume fraction of steel fibers and concrete strength, the bond stress of bonding specimens next to loaded end is improved and the ultimate bond stress moves to loaded end in general. Meanwhile, the slip at loaded end and free end were reduced. Finally, the bond-slip constitutive model reflecting the interaction process of rebar and SFRC was proposed.