计算力学学报2026，Vol.43Issue(1)：81-86,6.DOI:10.7511/jslx20241010001
开口和闭口截面薄壁梁约束扭转效应对比分析
Comparative analysis of restrained torsional effect between thin-walled beams with open and closed section
摘要
Abstract
To compare the constrained torsional effect of thin-walled beams with open and closed sections,practical formulas for the constrained torsional geometric properties of open-section beams were derived based on the constrained torsional theory of thin-walled bars.The initial parametric solutions to the constrained torsional generalized internal force and displacement of simply supported and cantilever beams with open and closed sections were obtained.A thin-walled box girder was chosen as a numerical example and the corresponding open section beam was selected by setting fictitious cut at the center of bottom plate.The generalized internal force,displacement and stress for constrained torsion of two types of thin-walled beams were compared and analyzed in detail.The results show that the principal sector moment of inertia of the open section is about 19 times that of the closed section.The mid-span torsional angle of the simply supported beam with open section is about 4 times that of the beam with closed section.The generalized internal force(absolute value)of the thin-walled beam with open section is significantly greater than that of the beam with closed section.The mid-span bimoment and the warping torque of the simply supported beam with open section is about 27 times and 3 times respectively that of the closed-section beam.The warping stress of the open-section beam is significantly larger than that of the closed-section.关键词
薄壁梁/开口截面/闭口截面/约束扭转/翘曲应力Key words
thin-walled beam/open section/closed section/restrained torsion/warping stress分类
交通工程引用本文复制引用
杜磊磊,张元海..开口和闭口截面薄壁梁约束扭转效应对比分析[J].计算力学学报,2026,43(1):81-86,6.基金项目
国家自然科学基金(52368020 （）
51968040)资助项目. （）
