双力矩作用下薄壁梁变形的数值分析  

Numerical Analysis of Deformation for Thin- walled Beams Acted by Bimoments

作　　者：张年文[1] 

机构地区：[1]广东石油化工学院建筑工程学院,广东茂名25000

出　　处：《广东石油化工学院学报》2014年第3期66-69,共4页Journal of Guangdong University of Petrochemical Technology

摘　　要：采用有限元实体单元,分析了薄壁截面悬臂梁在双力矩作用下的截面内变形。数值分析表明:开口截面在双力矩的作用下,截面以旋转变形为主,截面内的相对变形很小,与符拉索夫薄壁梁理论的"刚周边假定"吻合,符拉索夫的理论结果与实验结果符合很好;闭口截面在双力矩的作用下,以截面内的相对变形为主,截面的旋转较小,薄壁梁理论的"刚周边"假定与数值分析结果有出入。By using the solid dements of finite element methods, the deformations of the cross - sections for thin - walled cantilever beams are analyzed by the application of bimoments at the free end. The numerical results show that： for the open thin - walled beam acted by bimoment, the deformation of cross- section is the rotation of the cross - section, and the relative deformation of the cross - section is very small, which accords with Vlasov＇s rigid contour assumption, and numerical results agree well with the Vlasov＇ s theoretical results. For closed thin- walled cantilever beam acted by bimoments at the free end, most of the deformation for cross- section is distortion of the cross - section, and the relation of cross - section is small, and the assumption of rigid contour is not true from the numerical results.

关 键 词：双力矩 薄壁梁 闭口薄壁截面 开口薄壁截面 

分 类 号：TU311.1[建筑科学—结构工程]