太原理工大学学报2025，Vol.56Issue(2)：257-267,11.DOI:10.16355/j.tyut.1007-9432.20220891
Q690高强钢圆管构件受弯承载力分析与设计方法
Bearing Capacity Analysis and Design Method of Q690 High Strength Steel Round Pipe in Bending
摘要
Abstract
[Purposes]Most of the current research focuses on high strength steel axial compres-sion members,and the cross-section forms are mostly welded H-shaped sections and box sections.However,there are few studies focusing on the mechanical properties of Q690 high strength steel pipe under bending,especially the different failure characteristics and their boundaries of flexural members with changing slenderness ratio have not been systematically studied.[Methods]Numerical analyses were carried out for the mechanical properties and instability mechanism of Q690 high strength steel tubular bending members.The effects of initial imperfections such as residual stress,pre-buckling de-formation,and material plasticity on stable bearing capacity were investigated,and different failure characteristics were defined when slenderness ratio was changed.[Findings]According to on the analysis results,the bending bearing capacity curves of Q690 high strength steel pipe are obtained by the method in the European Code for Design of Steel Structures EN1993-1-6(2007),and the influ-ence parameters of the bearing capacity curves at different stages are determined.The calculation for-mulae of the ultimate bearing capacity of members at different stages are proposed.This work pro-vides scientific basis for the revision of steel structure design standard and high strength steel design standard in the future,and also provides theoretical support and design basis for the wide use of Q690 high strength steel round tube members in wind power tower,large span transmission tower,and sub-station framework.关键词
Q690高强钢/受弯承载力/残余应力/初始缺陷/屈曲Key words
Q690 high strength steel/bending bearing capacity/residual stress/initial imperfec-tion/buckling分类
建筑与水利引用本文复制引用
杜梦星,张昊,谌磊,李洪波..Q690高强钢圆管构件受弯承载力分析与设计方法[J].太原理工大学学报,2025,56(2):257-267,11.基金项目
河南省科技厅自然科学项目-联合基金项目(242103810069) （242103810069）
河南省教育厅自然科学项目(21A560007) （21A560007）
河南高校博士基金项目(2019BS009) （2019BS009）
