A uniaxial concrete constitutive model considering the bond-slip effect is proposed and its finite element analysis (FEA) implementation on a fiber section of a beam-column element is presented. The tension-stiffening, crack-closing, crack-opening, cyclic degradation of the tensile capacity of reinforced concrete are modeled, which reveals the significance of energy dissipation resulting from bond slip during crack opening and closing under cyclic loading. The model is based on a simplified mechanical concept in a smeared manner and verified through quasi-static test results of X-type slender RC columns. The FEA results using a common concrete model with no consideration of bond slip present significant pinching when predicting the hysteretic loop of slender columns, which is not consistent with the test results and underestimates the capacity of energy dissipation of cracking during cyclic load. The results obtained with the proposed model show good agreement with the test results, which can reflect the degradation of stiffness and strength as well as the energy dissipation of the crack opening and closing due to the bond slip effect. Considering its simplicity and computational efficiency, it is more applicable for analyzing large-scale structures than other methods that consider the bond-slip effect, especially for slender columns, such as those used in cooling towers and subjected to seismic excitation.

中文翻译：

---

考虑黏滑效应的新型单轴混凝土本构模型

提出了考虑粘结滑移效应的单轴混凝土本构模型，并提出了在梁柱单元纤维截面上的有限元分析（FEA）实现。对钢筋混凝土的拉伸刚度，闭合，裂缝，开裂，循环破坏进行了建模，揭示了循环荷载作用下开裂和闭合过程中粘结滑移导致能量耗散的重要性。该模型基于简化的机械概念，采用了涂抹的方式，并通过X型细长RC柱的准静态测试结果进行了验证。在预测细长柱的滞回线时，使用不考虑粘结滑移的普通混凝土模型进行的有限元分析结果会出现明显的收缩，这与测试结果不一致，并且低估了循环载荷下开裂的能量消散能力。所提模型的计算结果与试验结果吻合良好，可以反映出刚度和强度的下降以及由于粘结滑移效应引起的裂纹开合的能量耗散。考虑到它的简单性和计算效率，它比其他考虑键滑效应的方法更适用于分析大型结构，尤其是对于细长的柱子（例如，冷却塔中使用的柱子和受到地震激励的柱子）而言。这可以反映出由于粘结滑动效应导致的刚度和强度的下降以及裂纹的开合的能量耗散。考虑到它的简单性和计算效率，它比其他考虑键滑效应的方法更适用于分析大型结构，尤其是对于细长的柱子（例如，冷却塔中使用的柱子和受到地震激励的柱子）而言。这可以反映出由于粘结滑动效应导致的刚度和强度的下降以及裂纹的开合的能量耗散。考虑到它的简单性和计算效率，它比其他考虑键滑效应的方法更适用于分析大型结构，尤其是对于细长的柱子（例如，冷却塔中使用的柱子和受到地震激励的柱子）而言。