圆钢管混凝土柱框架节点抗剪承载力计算方法

摘要

圆钢管混凝土(CFCT)柱承载力高、延性好,可与不同类型的混凝土梁、钢梁或钢-混凝土组合梁可靠连接,形成满足不同功能需求的CFCT柱框架结构.CFCT柱框架节点抗剪承载力主要由节点核心区混凝土、钢管和加劲构造等抗剪元件承担,并受柱轴压力影响.总结提出了CFCT柱框架节点的抗剪机理以及各抗剪元件的抗剪贡献计算方法.基于课题组前期完成的CFCT柱框架节点抗剪试验结果,确定了柱轴压力对节点承载力的定量影响,并提出了CFCT柱框架节点抗剪承载力计算方法.该方法计算结果与国内外相关试验结果吻合良好.%Concrete filled circular steel tube (CFCT) columns,which behaved in high loading capacity and ductile manner,could be conveniently connected with reinforced concrete beams,steel beams,steel-concrete composite beams,and steel reinforced concrete beams to form a frame structures for different function.The shear resistance of the frame connections was composed of concrete core,circular steel tube,and stiffening rib,and also affected by the axial load.The shear-resistant mechanism of the frame connection with CFCT columns were summarized based on the available research results,and the calculation method of different shear-resistant parts of the connection was also proposed.Based on the test results,a calculation method of shear capacity of frame connection with CFCT columns was established for considering the effect of axial load.The calculation results were validated by the test results in available references.