两端偏心等边单角钢平行轴的压弯稳定  

Stability of Equal-Leg Angle x-x Axis with Eccentric Ends in Axial Compression and Bending

作　　者：葛保斌 左元龙 GE Bao-bin;ZUO Yuan-long(East China Electric Power Design Institute Co.,Ltd.Of CPECC,Shanghai 20001,China)

机构地区：[1]中国电力工程顾问集团华东电力设计院有限公司,上海200001

出　　处：《电力勘测设计》2020年第S01期127-136,共10页Electric Power Survey & Design

摘　　要：对于两端偏心的等边单角钢轴心受压杆件,国家标准不论平行轴和最小轴,给了一个小于1的承载力折减系数η,电力行业规范在长细比λ<120范围,通过一个大于1的修正系数K来放大杆件的长细比,以达到对承载力的折减,在120≤λ≤200范围,压杆的承载力不折减。这些公式没有正确表达等边单角钢的平行轴两端偏心受压的实际情况。现行国家标准的压弯稳定公式考虑了塑性发展系数,仅适用于小长细比的杆件;对大长细比的杆件,本文采用未经修正的压弯稳定原始公式,在长细比30~200范围内,对照电力行业规范的两端偏心受压计算公式,给出等边单角钢平行轴的两端偏心受压承载力小于1的折减系数ζ。For the eccentric equal-leg angle axially compressed members,the national standard gives a bearing capacity reduction factor_of<1,whether parallel axis or minimum axis.The electric power industry code enlarges the slenderness ratio of the members in the slenderness ratioλ<120,through a correction factor K>1,so as to achieve the reduction of the bearing capacity.In the range of 120<λ<200,the bearing capacity of the compression bar is not reduced,but these formulas do not correctly express the actual situation of eccentric compression at both ends of the parallel axis of the equal-leg angle.The current national standard formula for compression-bending stability considers the plastic development factor and is only applicable to members with small slenderness ratio.For members with large slenderness ratio,the original formula for compression-bending stability without modification is adopted.In the range of slenderness ratio from 30 to 200,the reduction factorof the eccentric compression bearing capacity of the two ends of the parallel axle of equal-leg angle is given,by comparing with the calculation formula of The electric power industry code.

关 键 词：单角钢平行轴 两端偏心 压弯稳定 长细比修正 折减系数 

分 类 号：TM75[电气工程—电力系统及自动化]