- 摘 要
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蔣 通
(同濟大學 上海 200092)[提要] 指出了在高層建筑結(jié)構(gòu)簡化計算中使用的、用雙曲函數(shù)表達的薄壁桿件扭轉(zhuǎn)剛度矩陣在實用中可能出現(xiàn)的問題。介紹了另兩種可統(tǒng)一考慮二次剪應力影響的扭轉(zhuǎn)剛度矩陣表達式。通過數(shù)值算例的對比，建議推廣應用計算結(jié)果穩(wěn)定、運用范圍廣的陳伯真表達式。
[關(guān)鍵詞] 薄壁桿件 扭轉(zhuǎn)剛度 二次剪應力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
