论高强度钢压杆稳定计算中的屈服强度因数

Discussion on the Yield Strength Factor in the Stability Calculation of High-Strength Steel Struts

《钢结构设计规范》(GB 50017-2003)关于压杆稳定计算的规定一般以Q235钢为基础,并通过引入屈服强度因数ξ=(fy/235)^(1/2)使其适用于高强度钢压杆。但是,这一因数的运用在很多情况下过于简单化,致使高强度钢压杆承载潜力不能充分发挥。本文对轴压构件的板件进行的综合分析表明,中等和大长细比构件的板件宽厚比限值只有一部分需要和因数ξ挂钩。此项分析同时采取了两种准则,并考虑了构件初弯曲的影响。格构式轴压构件剪力分析表明,现行规范的公式(5.1.6)的因数ξ可以删去。此外,单边连接的单角钢压杆简化为轴压构件时,等效长细比只要部分乘以因数ξ即可。

The regulations regarding strut stability calculation in the current code for design of steel structures （GB50017-2003） are based on Q235 steel and a factor of yield strength ξ=√（fy/235） is introduced to take care of high-strength struts. But, use of this factor has been in many instances overly simplified,so that the capacity of high strength struts can not be fully developed. Comprehensive analysis has shown that, for members of medium and large slenderness, only part of the limiting width thickness ratios need to be linked with the ξ factor. In this analysis two criteria have been adopted in combination and the influence of members＇ initial crookedness taken into account. The investigation of the shear force in the open-web compression members reveals that the factor ξ in Formula （5. 1. 6） of the current code could be deleted. Moreover, when single angle struts connected by one leg at the ends are treated as axially compressed members, their equivalent slenderness may be multiplied by the factor ξ only in part.