单角钢双向压弯构件的极限承载力分析  

Analysis on Ultimate Bearing Capacity of Biaxial Compression-flexure Member of Single-angle Steel

作　　者：吴海兵[1] 杨景胜[1] 白强[1] 王学群[1] 

机构地区：[1]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071

出　　处：《广东电力》2016年第8期111-115,共5页Guangdong Electric Power

摘　　要：双向压弯是角钢塔架主材和单斜材的普遍受力状态,鉴于双向压弯角钢极限承载力理论分析上的复杂性,借助有限元软件ANSYS,并考虑构件初弯曲和残余应力,对双向压弯角钢构件进行了数值分析,讨论了长细比、偏心率、构件截面尺寸、构件的内力分布以及初始缺陷对压弯构件极限承载力的影响。结果表明,偏心越大,构件承载力越低,偏心的不利影响随构件长细比的增加而逐渐减小;两端异号弯曲构件的承载力大于同号弯曲的情况。将有限元分析结果与美国房屋钢结构标准公式进行对比,结果表明美国房屋钢结构标准公式安全实用,建议在设计中采用。Biaxial bending and compression is general stress state of the main material and signal diagonal member of angle steel tower, in view of complexity of theoretical analysis on ultimate bearing capacity of the biaxial compression-flexure member of single-angle steel, this paper uses finite element software ANSYS and considers initial bending and remnant stress of the member to carry out numerical analysis on the biaxial compression-flexure member and discusses influence of slender- ness ratio, eccentricity, section dimension, member force distribution and initial imperfection on ultimate bearing capacity of the compression-flexure member. Results indicate that the larger eccentricity is, the lower bearing capacity is, and nega- tive influence of eccentricity gradually decreases with increase of slenderness ratio of member. In addition, bearing capacity of bending member with reverse curvature is greater than that of bending member with single curvature. It compares result of finite element analysis with formulas in AISC 360-10 and suggests to adopt the later in design which is more safer.

关 键 词：等边角钢 双向压弯 极限承载力 有限元分析 公式验证 

分 类 号：TM753[电气工程—电力系统及自动化]