钢骨增强异形柱框架节点受力性能及有限元分析

Mechanical behavior and finite element analysis of special-shaped column frame joints with steel bar reinforcement

为了解决异形柱结构节点薄弱的问题,提出了在异形柱框架节点核心区加入钢骨的改善措施,对钢骨增强异形柱节点和同等条件下未被增强的异形柱节点进行了拟静力试验研究,研究了试件的承载能力、变形能力等指标,分析了钢骨对混凝土异形柱受力性能的影响。采用ANSYS有限元分析软件对试件进行了非线性数值模拟。研究结果表明:ANSYS有限元模型可以基本反映节点的受力过程。钢骨增强了异形柱节点的承载能力和变形能力。钢骨通过发挥其强度作用直接参与节点核心区受力,在异形柱节点核心区加入钢骨能够提高核心区混凝土的抗压能力。钢骨增强的异形柱节点的受力性能得到了改善。

To modify the weakness of special-shaped column nodes, the improved measure that steel bar is placed in the core area of special-shaped column frame joint was proposed. Under the same conditions, the special-shaped column frame joint with and without steel bar reinforcement were tested quasi-statically. The indices of load bearing and deformation capacities were researched, and the influence of the steel bar on mechanical behavior of the reinforced concrete special-shaped column was analyzed. Nonlinear numerical simulation was carried out based on the ANSYS finite element analysis software. Results show that the stress process of joints can be reflected basically with ANSYS finite element model. The steel bar improves the bearing capacity and deformability of the special-shaped column frame joint obviously. The steel bars participate to bearing the joint core area stress directly through their strength. Placing steel bars improves the compressive strength of core area concrete. The mechanical property of the special-shaped column frame joint reinforced with steel bar may be improved.