李从林 程耀芳
    （兰州铁道学院 730070）

[提要]  提出筒中筒结构在扭矩作用下的超元法，即是对外框筒及楼板连续化处理以后，视整个结构为一个悬臂杆，然后按楼层划分成超级单元，导出超级单元的刚度矩阵，用矩阵位移法分析。用该法分析变刚度筒中筒结构的扭转问题，自由度很少，计算简便。
[关键词]  筒中筒结构 变刚度 超级单元 矩阵位移法

Super element method which is simpler in claculation for analyzing tube-in -tube structures with variable stiffness along the height subjected to sorsion is presented, ie, after treatment of the structure system with continuum technique, the whole structure is divided into super elements and is then analyzed by the matrix displacement method. The super element stiffness matrix of the structure is derived.
Keywords: tube-in-tube structures; variable stiffness; super element; matrix displacement method