摘要
首先简单阐述了我国钢梁稳定系数在我国不同时期各个版本的《钢结构设计规范》中的发展演变。分析发现，GB50017--2003~钢结构设计规范》中的钢梁稳定系数存在如下问题：1）强度计算演化为基于截面的承载力，而稳定系数的定义仍然停留在TJ17—74《钢结构设计规范》中的基于边缘纤维应力的定义；2）隐含了塑性开展系数1．1，该系数大于强度计算的系数1．05，且导致了对翼缘宽厚比为13～15的钢梁也利用了塑性开展系数；3）钢梁稳定系数取平均值，却未像TJ17—74在压杆稳定系数中引人附加安全系数；4）未区分焊接梁和轧制梁，对焊接梁更为不安全。
The evolution of the stability factors of steel beams in historical editions of Chinese code for design of steel structures is outlined. It is found by the analysis that the current factor for lateral-torsional buckling of steel beams that specified in GB 50017--2003 has the following problems： I ） Strength check has been based on crosss-seetional capacity, while the stability check is still based on the maximum stress on the most stressed edge of the section ; 2） The stability factor includes implicitly a plasticity factor of 1.1, greater than that used in the strength check（ 1.05 ）, and leading to greater unsafety of beams whose flange width-to-thickness ratio lying within 13 - 15 ; 3 ） Average curve is used, without introducing an additional safety factor, as used for column curve in TJ 17 -74; 4） no differences are made between rolled and welded beams.
出处
《工业建筑》
CSCD
北大核心
2014年第1期149-153,共5页
Industrial Construction
关键词
钢梁
稳定性
热轧截面
焊接截面
steel beam
stability
hot-rolled section
welded section
