剖分T型钢压杆弯扭屈曲稳定系数φ_b取值探讨  

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

作　　者：熊晓莉[1] 李晓宇 

机构地区：[1]河南工业大学土木建筑学院,郑州450001

出　　处：《建筑结构》2017年第21期73-77,35,共6页Building Structure

基　　金：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)

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。In the current Code for design of steel structures（GB 50017—2003）,the formula of stability coefficient φ_b for flexural members was complicated. So,the approximate formula of φ_b 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 φ_b were given for I-section and H-section members under bending moment. However,the simplified formula of stability coefficient φ_b was not given for hot-rolled cut-T section strut under bending moment. Based on the derivation of the regular formula of stability coefficient φ_b 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 φ_b 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.

关 键 词：剖分T型钢压杆 弯扭屈曲 稳定 简化公式 

分 类 号：TU318[建筑科学—结构工程] TU311.2