Square‐rebar reinforced concrete structures during the republic of China (ROC) (1912–1949) have special material properties and structural characteristics. To perform nonlinear finite element simulations of this special type of structure more accurately, a specialized bond‐slip constitutive model is built. Eighteen central pullout specimens were designed based on the ROC concrete mix proportions and the square‐rebar. Then, the test data were fitted with the universal global optimization method and the minimum Euclidean distance point method was chosen to calculate the inflection point matrix of the bond‐slip constitutive model. Finally, the main factors influencing the bond‐slip behavior of the ROC square‐rebar reinforced concrete were analyzed. The research results show that the corrosion of the square‐rebar produces a negative effect on the whole structure and a modified bond‐slip regression curve considering the size effect is obtained. The research results can provide a scientific basis for the nonlinear calculation of ROC square‐rebar reinforced concrete structures considering the bond‐slip behaviors.

中文翻译：

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民国时期方形钢筋混凝土粘结滑移特性的试验和数值研究（1912–1949）

中华民国（ROC）（1912年至1949年）期间的方钢筋混凝土结构具有特殊的材料特性和结构特征。为了更精确地执行这种特殊类型的结构的非线性有限元模拟，建立了专门的键滑本构模型。根据ROC混凝土配合比和方钢筋设计了18个中央抽拉试样。然后，将测试数据与通用全局优化方法进行拟合，并选择最小欧氏距离点方法来计算键滑本构模型的拐点矩阵。最后，分析了影响中华民国方钢筋混凝土粘结滑移性能的主要因素。研究结果表明，方形钢筋的腐蚀对整个结构产生负面影响，并且考虑到尺寸效应，获得了修正的结合滑动回归曲线。研究结果可为考虑粘结滑移特性的ROC方钢筋混凝土结构的非线性计算提供科学依据。