Q690高强钢管轴压承载力试验研究

Experimental study of axial bearing capacity of Q690 high-strength steel tubes

随着高强钢在工程实践中越来越广泛的应用,国内外很多专家学者越来越重视对高强钢钢结构的研究.目前国内的变电构架中,使用的钢材最高强度等级为Q420,与Q690尚有一定差距.在采用高强度钢材的情况下,构件的截面尺寸相对较小,压杆的稳定将是结构承载力最为重要的影响因素.现行《钢结构设计规范》(GB50017-2003)中给出的受压柱稳定系数是根据较低强度钢材试验结果得出的,与高强度钢材的柱子曲线存在一定的差异.为了使Q690高强钢管的受压稳定计算符合实际,对Q690高强圆钢管的轴压承载力进行了足尺试验研究,以为其工程设计提供科学依据.

With the rapid development of power transmission and transformation projects in China,steel supporting structure has already become the most popular structural form for these structures.However,the limit of steel grade used for current substation supporting structures is normally Q420,compared with that of Q690used in other countries,there is an obvious difference.When the high-strength steel is used,the geometric parameters of section for members become smaller,and the stability of members is the most important factor to influence the bearing capacity of structures.The stability factor for axial loaded steel members in current Code for design of steel structures(GB50017-2003)was derived based on the experimental results for steel members with lower steel grade;the results are inevitably different from those for high-strength steel members.To make the calculations of Q690high-strength steel tubes more accurate and reasonable,this paper conducts experimental study of the bearing capacity of Q690high-strength steel tubes under axial load so as to provide scientific basis for practical design of these structures.