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中文摘要：
对某高耸钢管塔带连接板的K型结点进行足尺模型试验，探讨极限承载力情况下的破坏现象和破坏机理，采用圆环-母线梁分离模型，根据钢管能量理论和虚功原理，推导出三管轴力作用下带连接板K型钢管结点的极限承载力公式，发现极限承载力不仅与主管壁厚、管径、结点板长度相关，还与主管轴向压力密切相关，同时提出了钢管在组合外力作用下存在临界轴压系数的概念。为K型钢管结点极限承载力设计提供依据。
英文摘要：
Full-scale tubular K-joints with tube-gusset plate connections are constructed and tested under static loads. The failure modes and failure mechanism are analyzed. Based on tubular energy theory and virtual work principle, using ring-generator separation model, this paper proposes the calculation method of the ultimate strength of the tube-gusset K-joint under three-axial load. It reveals that the ultimate strength of K-joints depends on tubular thickness, diameter, length of gusset, and main tubular stress. Moreover, for tall transmission tower, the concept of critical stress coefficient of K-joints under complex load is also proposed.
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