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为研究方钢管混凝土节点核心区的受力性能,在分析梁柱节点核心区受力特征的基础上,设计了方钢管混凝土节点核心区的直接剪切试验。试验装置简单,能够确保核心区发生剪切破坏,有效反映其受力特征。通过改变钢材及混凝土的强度、节点几何形状及加载方向等参数,完成了13个方钢管混凝土节点核心区试件的单调和往复剪切加载试验,得到了节点剪切破坏特征、荷载-位移曲线等结果,分析了相关参数的影响。在试验结果的基础上,利用理想弹塑性模型模拟钢材,并利用修正了剪力传递系数的固定角弥散裂缝模型模拟混凝土,提出了适用于一般节点核心区分析的高效精细有限元数值模拟方法。模拟结果与试验结果吻合良好,可为复杂组合结构的非线性分析提供参考。
In order to study the mechanical properties of CFSTN core zone, the direct shear test of core area of CFST node was designed based on the analysis of the stress characteristics in the core area of the beam-column joint. The test device is simple, can ensure the shear damage in the core area, and effectively reflect the force characteristics. The monotonic and reciprocating shear loading tests of 13 concrete-filled square steel tubular core sections were completed by changing the parameters such as the strength of steel and concrete, the geometry of joints and the loading direction. The shear failure characteristics of joints, load-displacement curve And other results, analysis of the impact of the relevant parameters. Based on the experimental results, the ideal elasto-plastic model is used to simulate the steel and the concrete is simulated by the fixed angle diffusion crack model with the shear transfer coefficient modified. A highly efficient finite element numerical simulation method suitable for the analysis of the core of common nodes is proposed. The simulation results are in good agreement with the experimental results, which can provide reference for the nonlinear analysis of complex composite structures.