钢构件容许长细比刍议  

Discussion on the allowable slenderness ratio of steel members

作　　者：陈绍蕃[1] 

机构地区：[1]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《建筑结构》2009年第2期113-115,60,共4页Building Structure

摘　　要：对3种情况的钢构件容许长细比进行分析,指出把容许长细比和与荷载有关的计算长细比挂钩不合理。建议不对一般钢框架柱设定长细比限值。抗震设防的框架柱的容许长细比性质和非抗震设防者不同,不能贸然删除。但单阶柱上段的计算长细比不宜作为容许长细比的衡量对象。桁架受拉弦杆承担对受压腹杆的端部提供侧向支承的任务,其长细比应满足必要的要求,设计规范中的有关规定需要加以修改。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.

关 键 词：长细比 框架柱 桁架受拉弦杆 抗震结构 

分 类 号：TU391[建筑科学—结构工程] TP13[自动化与计算机技术—控制理论与控制工程]