钢骨及X形配筋增强的混凝土异形柱框架中节点受力性能

Mechanical behavior of joints in concrete special shaped columns with steel or x-shaped reinforcement

在混凝土异形柱框架中节点核心区分别加入T形钢骨、槽型钢骨或X形配筋,研究了不同增强措施下混凝土异形柱框架节点的受力性能,分析了混凝土异形柱框架中节点的破坏特征,对比混凝土异形柱框架中节点核心区混凝土应变的变化规律,同时也进行了箍筋应变的分析,以研究T形钢骨、槽型钢骨、X形配筋对混凝土异形柱框架中节点受力性能的增强作用。结果表明:在异形柱中节点核心区加入T形钢骨、槽型钢骨或X形配筋均能够改善混凝土异形柱框架中节点的受力性能,与剪力方向平行的混凝土异形柱框架中节点核心区腹板的箍筋应变比混凝土异形柱框架中节点核心区翼缘处的箍筋应变大,T形钢骨、槽型钢骨或X形配筋对提高混凝土异形柱框架中节点核心区混凝土主拉应变作用显著。

T - shaped steel, groove - shaped steel or X-shaped reinforcement are added to interior joint core zone of concrete special shaped columns The mechanical behavior of interior joint reinforced by T-shaped steel, groove- shaped steel or X-shaped reinforcement were researched. The damage characteristic of interior joint were analysed, the concrete strain variation as well as the stirrup strain variation of interior joint in the core area were compared to research the strengthening function of T-shaped steel, groove-shaped steel or X-shaped reinforcement. Results show that the mechanical characteristic of interior joint with T-shaped steel, groove-shaped steel or X-shaped reinforce- ment was improved. The stirrup strain of interior joint in parallel with shear force in web is much higher than that in flange The concrete tensile strain capacity of the interior joint is improved obviously by T-shaped steel, groove- shaped steel or X-shaped reinforcement