（1 申都设计集团有限公司， 上海 200433； 2 上海三益建筑设计有限公司， 上海 200050;3 同济大学建筑工程系， 上海 200092）

［摘要］对45根热轧Q420高强度角钢进行了轴心受压试验，得到了3种不同尺寸截面和5种不同长细比的角钢试件的稳定承载力和破坏模式。宽厚比较大的L125×8角钢以局部失稳为主，而宽厚比较小的L125×10和L140×10在长细比较小时为局部失稳、长细比较大时发生整体失稳。利用ANSYS软件对试件进行了承载力分析，有限元模型考虑材料及几何非线性，以及初始几何缺陷和残余应力，数值结果与试验结果吻合良好。利用我国DL/T 5154—2012规范、美国ASCE 10-97导则及LRFD-SAM-2000规范计算了角钢试件的承载力，与试验结果比较表明，美国ASCE 10-97导则及LRFD-SAM-2000规范计算结果与试验值较为接近，而DL/T 5154—2012规范计算得到的承载力偏小。

［关键词］高强度角钢； 轴心受压； 稳定承载力； 试验研究； 数值分析； 设计规范

中图分类号：TU392-1文献标识码：A文章编号：1002-848X(2020)03-0100-05

Experimental study on bearing capacity of Q420 high-strength angle steel under axial compression

Yu Chunhai1, Chen Fangfang2, Xie Qiang3, Wu Minger3

(1 Shendu Design Group Co., Ltd., Shanghai 200433, China; 2 Shanghai Sunyat Design Co., Ltd., Shanghai 200050, China;3 Department of Structural Engineering, Tongji University, Shanghai 200092, China)

Abstract:The axial compression experiment was performed on 45 hot-rolled Q420 high-strength angle steels, and the stability bearing capacity and failure mode of 3 types of angle steel specimens with different cross sections and 5 different slenderness ratios were obtained. L125×8 angle steels with larger width and thickness featured mainly local instability. While L125×10 and L140×10 angle steels with smaller width and thickness featured local instability when the slenderness was smaller, and featured overall instability when the slenderness was larger. The ANSYS software was used to analyze the bearing capacity of the experiment specimens. The finite element model considered material and geometric nonlinearity, as well as initial geometric defects and residual stress. The numerical results agreed well with the experimental results. Using China′s DL/T 5154-2012 code, the US ASCE 10-97 code and the LRFD-SAM-2000 code, the bearing capacity of angle steel specimens was calculated. Compared with the experiment results, the calculation results according to the ASCE 10-97 code and LRFD-SAM-2000 code were close to the experiment results, and the bearing capacity calculated by the DL/T 5154-2012 code was smaller.

Keywords:high-strength angle steel; axial compression; stability bearing capacity; experimental study; numerical analysis; design code

作者简介：于春海，硕士，高级工程师，Email:bestyu78@139.com。