纯剪状态下蜂窝梁腹板的弹性屈曲分析  

作　　者：范财军 邓皓 熊竹筠 田如萍 袁辉 刘兴 

机构地区：[1]四川文理学院建筑工程学院,四川达州635000

出　　处：《科技创新与应用》2024年第6期12-17,共6页Technology Innovation and Application

基　　金：达州市建筑环境工程技术研究中心2022年度开放课题项目(SDJ2022ZB-02)。

摘　　要：该文利用有限元软件建立正六边形孔蜂窝梁腹板在纯剪应力状态下的有限元模型,研究四边简支开孔板在纯剪状态下的屈曲模式,分析孔洞尺寸对蜂窝梁腹板屈曲临界应力的影响,提出纯剪状态下开孔板的屈曲系数计算公式,得到蜂窝梁开孔腹板在纯剪状态下的高厚比限值。研究表明,单孔板和双孔板的最大屈曲平面外位移处的连线均与水平方向呈45°,四孔板和六孔板则有2种屈曲模式;蜂窝梁腹板孔高比和距高比是影响开孔板屈曲临界应力的主要因素,建议对于剪力作用较大的蜂窝梁腹板取孔高比γ<0.5,距高比0.4<β<0.5的孔洞尺寸,使得容易实现稳定性和经济性要求;拟合的开孔板屈曲系数公式误差不超过5%,具有良好的精度。In this paper,the finite element model of the web of regular hexagonal perforated honeycomb beam under pure shear stress is established by using finite element software,and the buckling mode of quadrilateral simply supported perforated plate in pure shear state is studied.The influence of hole size on the buckling critical stress of honeycomb beam web is analyzed,the buckling coefficient formula of perforated plate in pure shear state is put forward,and the limit value of height-thickness ratio of perforated web in pure shear state is obtained.The results show that the connection line at the maximum buckling plane displacement of single-hole plate and double-hole plate is 45°to the horizontal direction,while four-hole plate and six-hole plate have two buckling modes,and the hole height ratio and distance height ratio of honeycomb beam web are the main factors affecting the critical buckling stress of perforated plate.It is suggest taking the hole height ratio for honeycomb beam web plates with high shear forceγ<0.5,hole size with a distance to height ratio of 0.4<β<0.5,making it easy to achieve stability and economic requirements.The error of the buckling coefficient formula of the fitted perforated plate is less than 5%,with a satisfactory accuracy.

关 键 词：蜂窝梁 开孔板 纯剪切 弹性屈曲 有限元模型 

分 类 号：TU313.1[建筑科学—结构工程]