变电构架中Q235～Q420牌号角钢和钢管适用性分析

Applicability analysis of Q235～Q420 angle steels and steel pipes in substation frame

为研究不同牌号角钢和钢管在变电构架中的适用范围,应用有关规范对Q235～Q420轴心受压角钢和钢管、单向偏心受压钢管以及纯弯钢管的承载力比值进行了大量计算分析。结果表明:相对于一般规格轴心受压Q235角钢和钢管,Q345,Q390,Q420钢材的长细比经济适用范围分别为λ≤100,λ≤110和λ≤120;相对于一般规格轴心受压Q345角钢和钢管,Q390和Q420钢材的长细比经济适用范围分别为λ≤40和λ≤70;高强钢应用于单向压弯钢管和纯弯钢管时,其经济性能将得以充分发挥。

To study the applicability of Q235 - Q420 angle steels and steel pipes in substation frame, the load carrying capacity ratio of Q235 - Q420 axial compressive angle steels and steel pipes, eccentrically loaded and pure bending steel pipes were analyzed according to some relevant standards. Four kinds of steels have been considered： Q235, Q345, Q390, Q420. The results show that relative to general Q235 axial compressive angle steels and steel pipes,economic application scope of slenderness ratio for Q345, Q390 and Q420 steel are λ≤100,λ≤110 and λ≤120 respectively. Relative to general Q345 axial compressive angle steels and steel pipes, economic application scope of slenderness ratio for Q390 and Q420 are λ≤40 and λ≤70 respectively. Good economic results will be obtained for high strength steels used in eccentrically loaded and pure bending steel pipes.