大宽厚比Q420角钢轴压构件稳定性能试验研究  

Experimental study on stability of Q420 angle steel compression members with high width-thickness ratio

作　　者：邢海军[1] 李茂华[1] 杨靖波[1] 吴静[1] 张祥禄[1] 

机构地区：[1]中国电力科学研究院,北京100055

出　　处：《中国电力》2010年第10期23-26,共4页Electric Power

摘　　要：通过对75根大宽厚比Q420高强度等边角钢的轴压试验,研究了该类构件的稳定性能,总结了其失稳变形特征,并将其稳定承载力与我国电力行业标准的设计值进行对比分析。研究表明两端铰接的Q420高强度等边角钢中长柱呈弯扭失稳,短柱呈局部屈曲;轴压柱的稳定设计折减系数的试验值高于规范计算值,并与构件的长细比有直接关系,针对这一关系提出了修正公式。试验结果说明Q420高强度等边角钢的屈曲强度比普通强度角钢提高很多。研究成果为高强度角钢轴压构件的稳定设计提供了前提条件,并为已有设计方法的修正提供了建议和依据,有利于我国Q420高强度角钢在输电铁塔结构中的应用。Based on the compression test of 75 Q420 high strength equal-leg angle columns, the buckling behavior of such angle members were analyzed and their buckling models were summarized. The buckling strength of the specimens were compared with that according to the technical regulation of design for tower and pole structures of overhead transmission line in China. It showed that for the axial compression Q420 equal-leg angle columns with large slenderness, the flexural-torsional buckling failure mainly occurred, while for those with small slenderness, the local buckling failure mainly occurred. The test results of the buckling design reduction factor for angle columns were larger than that according to the Chinese technical regulation, and the test results showed that the reduction factor ms had relationship with the slenderness of columns, and the calculation equations were suggested. Based on the experimental study, it can be found that the buckling strength of Q420 high strength equal-leg angle columns is higher than that of ordinary angle steel. These research works can provide the basis for the study on the design method of high strength angle eolunms, and can also be helpful for the engineering application of Q420 high strength angles in tower structures.

关 键 词：输电铁塔 Q420高强度角钢 大宽厚比 稳定性能 试验研究 规范对比 

分 类 号：TU391[建筑科学—结构工程]