曹现雷 徐勇 郝际平

摘 要：为研究Q460高强角钢轴压构件的受力性能，采用静力试验对试件破坏状态和稳定承载力进行分析，两端设置球铰、单刀口铰和双刀口铰支座，分析了不同铰接方式对构件受力性能的影响。结果表明，采用不同支座均能很好地反映杆件的受力性能;短构件的极限承载力由钢材强度控制，长细比变化对其影响很小，长细比等于30和45的试件以局部破坏为主，长细比等于60和80的杆件以整体弯曲失稳为主。比较试验和各规范理论计算结果发现，试验值显著高于中国DL/T 5154—2002杆塔技术规定计算值，与美国ASCE 10—97导则计算值吻合较好。

关键词：

高强度钢材;轴心受压;试验研究;长细比

中图分类号：TU391

文献标志码：A  文章编号：1674-4764（2018）06-0146-07

Experimental analysis on ultimate bearing capacity of Q460

high-strength angle members under axial compression

Cao Xianlei1，2 ， Xu Yong1， Hao Jiping3

（1.Department of Architecture Engineering， Anhui University of Technology， Maanshan 243032， Anhui， P. R. China;

2.Jiangsu Province Key Laboratory of Structure Engineering， Suzhou 215011， Jiangsu， P. R. China;

3.College of Civil Engineering， Xi'an University of Architecture and Technology， Xi'an 710055， P. R. China）

Abstract：Laboratory experiments were carried out to investigate the behavior of Q460 high strength angle members under axial compression via the static testing method. The various supporting conditions， including the spherical hinge， single knife-edge and double knife-edge bearing， are applied to study their effects on bearing capacity of members. The results show that the supporting conditions can represent the behavior of specimens. Specimens with small slenderness ratio of 30 to 45， of which the ultimate bearing capacity are determined by strength of steel instead of slenderness ratio， are subjected to a local buckling failure. While specimens with large slenderness ratios of 60 to 80 are mainly subjected to global bending instability. Comprehensive comparisons indicate that the test results are in good agreement with the calculations from the American regulation ASCE10-97， and are significantly greater than those from the Chinese regulation of DL/T 5154-2002.

Keywords：high strength steel; axial compression; experimental research; slenderness ratio

现代结构工程对结构材料高强化的要求日益显著，随着冶炼技术的不断提高，生产出强度高、质量稳定的高强度钢材已不再困难，这就使得高强角钢运用于输电铁塔成为可能。中国输电线路铁塔大多使用235、345 MPa等普通热轧角钢，相比日本、美国，品种单一且强度较低[1] ，因此，高强度角钢的推广很有必要。

已有不少学者对角钢受压构件开展了相关研究[2-7] 。Usami等[8] 完成两种等级等边角钢试验，表明小长细比杆件极限荷载与美国ASCE-1997导则[9] 计算值稳合较好，大长细比试验值则大于ASCE值。Adluri等[10] 研究角钢受压构件的屈曲模式，发现86版美国钢结构规范AISC-LRFD设计偏安全，拟合出角钢构件修正柱子曲线。曹现雷等[11] 研究了Q460单角钢一端轴心一端偏心加载杆件破坏形态和受力性能，表明中国DL/T 5154—2002规范[12] 计算方法偏保守，提出改良ASCE后的设计方法。……