(河南工业大学土木工程学院, 郑州 450001)

摘要: 为了研究国产 Q460 高强钢焊接 T 形截面轴心压杆的整体稳定承载力,用厚度为 8mm 和 12mm 的国产Q460 高强度钢板制作了 3 根焊接 T 形截面试件进行轴心受压试验. 基于实测的钢材力学性能、截面残余应力和试件几何尺寸,建立考虑了初始几何缺陷和力学缺陷的有限元模型,分析预测试件的极限承载力,并将有限元结果与试验结果进行对比,验证有限元分析方法的正确性. 利用经试验验证的有限元分析方法,补充计算了 24 根不同长细比压杆的整体稳定极限承载力,将相应的整体稳定系数与《钢结构设计标准》(GB 50017—2017)中的柱子稳定系数曲线进行比较. 研究表明,国产 Q460 高强钢焊接 T 形截面轴心压杆的整体失稳形式为绕对称轴的弯扭失稳,失稳时压杆进入了弹塑性变形阶段,在设计过程中选取 b 类截面柱子曲线对其进行计算是安全可靠的.

关键词: 高强钢; 焊接 T 形截面; 轴心压杆; 整体稳定; 极限承载力; 有限元分析

中图分类号:TU391 文献标志码:A 文章编号:1002-848X(2023)10-0062-05

DOI:10. 19701 / j. jzjg. 20210031

Research on overall stability bearing capacity of domestic Q460 high strength steel welded T-section columns under axial compression

XIONG Xiaoli, DU Kun, MA Meng

(College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China)

Abstract: In order to study the overall stability capacity of domestic Q460 high strength steel welded T-section columnsunder axial compression, three T-section columns were welded with 8mm-thick and 12mm-thick Q460 high strength steelplates made in China were made for axial compression test. The finite element models were built up according to measuredmechanical properties of steel, section residual stress and measured sizes of members. And residual stress and initialgeometric imperfection were considered in the finite element models to analyze and predict the ultimate bearing capacity ofthe columns. The finite element results were compared with the experimental results to verify the correctness of the finiteelement analysis method. Based on the finite element analysis method verified by experiment, the overall stable ultimatebearing capacity of 24 different slenderness columns were calculated and compared with column stability coefficient curvesin Standard for design of steel structures(GB 50017—2017). The study shows that the overall instability form of domesticQ460 high strength steel welded T-section columns was bending and torsional around the symmetry axis, and thecompression columns enter the elastic-plastic deformation stage when the instability occurs. It is safe and reliable to selectthe stability coefficient curve of the type b columns to calculate in the design process.

Keywords:high strength steel; welded T-section; axial compression column; overall stability; ultimate bearing capacity;finite element analysis

∗国家自然科学基金(51308194).

第一作者:熊晓莉,博士,副教授,硕士生导师,主要从事结构稳定理论研究、建筑钢结构设计原理及应用、新型仓储结构力学性能研究与应用,Email:x_shanley@ sina. com.

[引用本文] 熊晓莉,都坤,马萌. 国产 Q460 高强钢焊接 T 形截面轴心压杆整体稳定承载力研究[J]. 建筑结构,2023,53(10):62-66,121. XIONG Xiaoli,DU Kun,MA Meng. Research on overall stability bearing capacity of domestic Q460 highstrength steel welded T-section columns under axial compression[J]. Building Structure,2023,53(10):62-66,121.