[提要]  提出了结点刚域长度不仅与结点结构布置而且与结点受力状况有关的概念，推导出T型结点刚域长度的修正公式，并将其应用在框筒的平面框架子结构法中，得到了令人满意的结果。
[关键词]  结点刚域长度 框筒结构 平面框架子结构

One new conception is proposed that the length of stiffness zone of a joint is affected by its internal force, as well as its layout.A formula to obtain such a length of T-shaped intersection joint has been derived, which is applied in plane frame substructure program to analyse a 30-storey frame tube structure and the satisfactory result is achieved.
Keywords: stiffness zone length; joint; frame-tube structure; plane frame substructure