- 摘 要
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陳紹蕃
（西安建筑科技大學結構工程與抗震教育部重點實驗室，西安710055）[摘要] 對3種情況的鋼構件容許長細比進行分析，指出把容許長細比和與荷載有關的計算長細比掛鉤不合理。建議不對一般鋼框架柱設定長細比限值?？拐鹪O防的框架柱的容許長細比性質和非抗震設防者不同，不能貿然刪除。但單階柱上段的計算長細比不宜作為容許長細比的衡量對象。桁架受拉弦桿承擔對受壓腹桿的端部提供側向支承的任務，其長細比應滿足必要的要求，設計規(guī)范中的有關規(guī)定需要加以修改。
[關鍵詞] 長細比；框架柱；桁架受拉弦桿；抗震結構Discussion on the allowable slenderness ratio of steel members
Chen Shaofan
( Key Laboratory of Structural and Aseismatic Engineering of Education Ministry, Xi'an University of Architecture & Technology, Xi'an 710055, China)
Abstract: Three topics of allowable slenderness ratio of steel members are investigated. It is revealed that tying the allowable slenderness to the loading dependent slenderness for buckling calculation is irrational. Suggestion is made to release the common steel frame columns from the slenderness ratio limitation. Whereas for frame columns subject to earthquake, the allowable slenderness ratio, having a different meaning, may not be hastily deleted. But the upper portion of the single stepped columns should not be chosen as the object for slenderness limitation. The tension chord of trusses has the duty of providing lateral support to the connected compressive web members, so that its slenderness ratio should satisFy necessary requirement and relevant provision in design code has to be amended.
Keywords: slenderness ratio; frame columns; tension chord of trusses; aseismatic structures
