往复荷载作用下锈蚀钢筋混凝土柱黏结滑移模型及数值模拟研究

为实现地震作用下锈蚀钢筋混凝土柱精细化数值模拟分析,基于已有研究成果建立往复荷载作用下锈蚀钢筋与混凝土间的黏结滑移本构模型:结合课题组前期试验结果,采用ABAQUS有限元分析软件对建立的黏结滑移本构模型进行有效性验证,通过对数值计算结果与试验结果之间误差分析,进一步对黏结滑移模型中的摩擦黏结应力系数和退化系数进行修正,最终建立更为合理的锈蚀钢筋与混凝土间黏结滑移本构模型。通过数值计算结果与试验结果的再次比较,验证修正后黏结滑移本构模型的有效性。结果表明:修正后的锈蚀钢筋与混凝土间黏结滑移模型可更好地反映往复荷载作用下锈蚀钢筋混凝土柱的滞回性能。该成果可为地震作用下锈蚀钢筋混凝土结构的数值分析计算提供理论参考。

A bond-slip constitutive model and numerical simulation for corroded reinforced concrete columns under cyclic loading

To model the seismic behavior of corroded reinforced concrete columns accurately, in this paper, based on the existing research results, a bond-slip constitutive model between corroded steel bar and concrete under cyclic loads was established. The validity of the bond-slip model was then verified by the ABAQUS finite element analysis software. The friction bond stress and bond degradation coefficients in the bond-slip model were further corrected by analyzing the error between the numerical calculation results and the test results, and a more reasonable bond-slip constitutive model between corroded steel bars and concrete was established. The validity of the modified model was verified by comparing the numerical results with the experimental results again. The results showed that the modified bond-slip model can better reflect the hysteretic performance of corroded reinforced concrete columns under cyclic load. The results can provide a theoretical reference for the numerical analysis and calculation of corroded reinforced concrete structures under earthquake.