（河南工业大学土木建筑学院， 郑州 450001）

［摘要］《钢结构设计规范》（GB 50017—2003）中梁的整体稳定系数φb计算公式比较复杂，在计算压弯构件弯扭失稳承载力时，提供了相应的简化计算公式。修订的新规范对梁的整体稳定计算做出了较大调整，但计算公式仍较为复杂。而且修订的新规范仅对工字形和H形截面构件提供了简化公式，未对T型截面构件做出说明。通过对均匀弯曲的剖分T型截面受弯构件整体稳定系数计算公式推演，结合相关文献中各种φb计算公式的分析对比，提出合理的剖分T型钢压杆弯扭屈曲稳定系数简化公式。利用简化公式计算多根剖分T型钢压杆的整体稳定承载力，并对比有限元软件ANSYS分析结果，验证简化公式的正确性。

［关键词］剖分T型钢压杆； 弯扭屈曲； 稳定； 简化公式

中图分类号：TU318， TU311-2文献标识码：A文章编号：1002-848X(2017)21-0073-05

Discussion on  the stability coefficient φb for flexural-torsional buckling of hot-rolled cut-T section struts

Xiong Xiaoli, Li Xiaoyu

(Civil Engineering and Architecture Department, Henan University of Technology, Zhengzhou 450001, China)

Abstract:In the current Code for design of steel structures (GB 50017—2003), the formula of stability coefficient φb for flexural members was complicated. So, the approximate formula of φb was given to caculate the bearing capacity of flexural-torsional buckling of beam-columns. In the final draft of the revised version of code, the overall stability calculation of beams has been changed to a large extent, but is still rather complicate. While new simplified formulas of stability coefficient φb were given for I-section and H-section members under bending moment. However, the simplified formula of stability coefficient φb was not given for hot-rolled cut-T section strut under bending moment. Based on the derivation of the regular formula of stability coefficient φb for hot-rolled Cut-T-section strut under bending moment, and combined with the analysis and comparision of the formulas in references, the simplified formula of stability coefficient φb was suggested for hot-rolled cut-T section strut under bending moment. The load capacity of several hot-rolled cut-T section struts were computed by the simplified formula, and those calculation results are verified by the nonlinear buckling analysis of load capacity of hot-rolled cut-T section strut models by using ANSYS software.

Keywords:hot-rolled cut-T section strut; flexural-torsional buckling; stability; simplified formula

*国家自然科学基金项目（51308194），河南工业大学青年骨干教师培育计划项目（20141101X）。

作者简介：熊晓莉，博士，副教授，Email：x_shanley@sina.com。