蒋  通
    (同济大学 上海 200092)

[提要] 指出了在高层建筑结构简化计算中使用的、用双曲函数表达的薄壁杆件扭转刚度矩阵在实用中可能出现的问题。介绍了另两种可统一考虑二次剪应力影响的扭转刚度矩阵表达式。通过数值算例的对比，建议推广应用计算结果稳定、运用范围广的陈伯真表达式。
[关键词]  薄壁杆件 扭转刚度 二次剪应力

This paper points out possible problems in calculation of the torsional stiffness matrix of a thin - walled beam element expressed by the hyperbolic function. A nother two expressions of the torsional stiffness matrix, taking into account the effect of the secondary shear stress, have been introduced. After numerical comparison, the author suggests that B.Z.Chen's expression, applicable to thin - walled beam elements with cross - section of any shape, should be extended.
Keywords: thin - walled beam; torsional stiffness; seconclary shear stress