中文摘要：

“T形件”是组合结构梁柱连接节点的重要组件，文章利用组件法，以“T形件”为基本单元，分别给出了各组件的刚度计算方法，如钢筋抗拉刚度、柱壁抗压刚度、柱壁抗剪刚度、端板抗弯刚度、柱壁抗弯刚度、螺栓抗拉刚度，提出了负弯矩作用下端板连接半刚性钢管混凝土组合节点初始刚度计算公式；通过试验验证了所提负弯矩作用下组合节点初始刚度简化计算方法的正确性和准确性。该研究成果可为建立半刚性钢管混凝土组合框架设计方法提供科学依据。

英文摘要：

T-shaped component is an important component of beam-to-column connection of the com- posite structure. Selecting T-shaped component as basic element and using the component method, the calculation method of initial stiffness of semi-rigid concrete-filled steel tubular（CFST） composite joints under negative moment is obtained. Some components are given, including reinforced bar tensile stiffness, column wall compressive stiffness, column wall anti-shear stiffness, end plate bending stiff- ness, column wall bending stiffness and bolt tensile stiffness. The correctness and accuracy of the simplified calculation method of initial stiffness of semi-rigid CFST composite joints under negative moment are verified by experiments. The research results can provide a scientific basis for the design of semi-rigid CFST composite frame.