高强大规格等边角钢轴压承载力研究  

Study on the Bearing Capacity of High Strength Large Size Equal Angles Steels Under Axially Loaded Compression

作　　者：赵楠[1] 李正良[1] 刘红军[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《四川大学学报（工程科学版）》2013年第1期74-84,共11页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51078367)

摘　　要：进行了19个长细比λ=30～90的Q420 L220 mm×20 mm角钢试件的轴压试验研究。结果表明:此类构件在长细比λ>45时,以弯曲失稳破坏为主;长细比λ45时,以弯扭失稳为主。研究了现行钢结构规范中防止局部屈曲宽厚比限值公式和计算弯扭失稳的换算长细比取值公式的适用性。采用逆算单元长度法得到了大规格等边角钢的柱子曲线,研究了此类构件与普通规格等边角钢的差异以及肢厚、肢宽和钢材强度等对柱子曲线的影响。提出了高强大规格等边角钢轴压构件的承载力计算方法。并且研究了高强大规格等边角钢两端偏心受压的柱子曲线,给出了长细比修正系数的建议公式。The axial compression member test was conducted to investigate the stability performance of these members, including nineteen Q420 L220 ×20 specimens which slenderness ratio（ A ） ranged from 30 -90. The test results showed that when slenderness is λ 〉 45, flexural buckling was observed and when slenderness is λ ≤ 45, local or flexural-torsion or torsion buckling was observed. The applicability of local buckling wide thickness ratio formula and flexural-torsional buckling conversion slenderness ratio formula was researched. By means of inverse calculation segment length method, the column curve of the large size equal angle was got. The comparison with common size angle and parameter analysis was made. Calculation method of bearing capacity of large size equal angle was given. Two ends eccentric compression column curve was also researched, and a suggestion formula of slenderness ratio correction coefficient was given.

关 键 词：高强大规格等边角钢 轴压静力试验 逆算单元长度法 柱子曲线 

分 类 号：TM753[电气工程—电力系统及自动化] TU279.7[建筑科学—建筑设计及理论]