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为了对型钢混凝土构件进行精细化建模分析,首先建立了仅依靠材料参数的混凝土本构关系以及损伤演化方程,根据型钢应变的发展以及屈曲影响,得到了型钢损伤本构模型。通过对型钢与混凝土粘结-滑移机理的进一步分析,进而建立了一种同时考虑粘结损伤和力学损伤的型钢与混凝土界面损伤模型,以合理考虑粘结-滑移对构件力学性能的影响。最后,对型钢混凝土框架柱试件进行了数值分析,通过与低周反复荷载作用下型钢混凝土框架柱试验所得滞回曲线的对比,发现该数值模拟计算结果较为精确,同时所提出的材料损伤模型较好地反映地震作用下型钢混凝土构件力学特性的变化。研究结果可为型钢混凝土结构地震作用下的非线性分析提供理论参考。
In order to refine and analyze the SRC members, firstly, the constitutive relationship of concrete and damage evolution equation are established only based on the material parameters. According to the development of the strain and the buckling effect, the damage constitutive model is obtained. Based on the further analysis of the bond-slip mechanism between profiled steel and concrete, an interface damage model between profile steel and concrete considering bond damage and mechanical damage is established to reasonably consider the effect of bond-slip on the mechanical properties of the profile. . Finally, the numerical analysis of the specimens of SRC columns is carried out. By comparing with the hysteretic curves of SRC columns subjected to low cycle repeated loading, the results of the numerical simulation are more accurate. Meanwhile, the proposed material damage model It can well reflect the change of mechanical properties of SRC members under earthquake. The results can provide theoretical reference for the nonlinear analysis of SRC structures under earthquake action.