尹越^1,2, 刘卓¹, 王帅¹, 黄逸群¹
AuthorsHTML:尹越^1,2, 刘卓¹, 王帅¹, 黄逸群¹
AuthorsListE:Yin Yue^1,2, Liu Zhuo¹, Wang Shuai¹, Huang Yiqun¹
AuthorsHTMLE:Yin Yue^1,2, Liu Zhuo¹, Wang Shuai¹, Huang Yiqun¹
Unit:1. 天津大学建筑工程学院，天津 300072；2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072
Unit_EngLish:1．School of Civil Engineering, Tianjin University, Tianjin 300072, China
2．Key Laboratory of Coast Civil Structure and Safety of Ministry of Education(Tianjin University), Tianjin 300072, China
Abstract_Chinese:平面钢管桁架的整体稳定性主要由其受压弦杆的平面外稳定性决定．本文针对上弦简支、承受均布荷载的平面钢管桁架, 采用势能原理确定了考虑受压弦杆不均匀轴力影响的计算长度系数和考虑桁架附加扭转效应的承载力折减系数, 结合轴心受压构件整体稳定相关设计规定, 建立了平面钢管桁架整体稳定承载力实用设计方法．采用有限单元法, 对24例不同几何参数的平面钢管桁架进行了线性屈曲分析和考虑初始几何缺陷的非线性稳定分析．由本文实用设计方法计算得到的平面钢管桁架整体稳定承载力与有限元分析结果吻合良好, 验证了实用设计方法的合理性和可靠性．最后, 通过非线性有限元分析讨论了较大初始几何缺陷(跨度/300)对平面钢管桁架整体稳定性的影响．
Abstract_English:The overall stability of planar steel tubular trusses is mainly related to the out-of-plane stability of their compressive chords. In this paper，simply supported planar steel tubular trusses under evenly distributed load were taken as a case study. Based on the principle of potential energy，effective length factor was determined by considering the variation of the axial force in the compressive chords，and reduction factor was calculated by considering the effect of torsion on the load carrying capacity of planar steel tubular trusses. Practical design approach was then presented for the overall stability of planar steel tubular trusses based on the design regulation for axial loaded compressive members. Linear buckling analysis and nonlinear stability analysis with the consideration of initial imperfection were made for a total number of 24 planar steel tubular trusses by FEM. The load carrying capacity of planar steel tubular trusses obtained by the presented practical design approach agreed very well with the results of FEA，which verified the applicability and reliability of the presented practical design approach. The effect of relatively larger initial imperfection(span/300)on the overall stability of planar steel tubular trusses was also discussed by FEA.
Keyword_Chinese:平面钢管桁架; 整体稳定性; 实用设计方法; 受压弦杆不均匀轴力; 扭转效应
Keywords_English:planar steel tubular truss; overall stability; practical design approach; variation of axial force in compressive chords; effect of torsion

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