摘要
分析货架立柱腹板的局部屈曲和截面的畸变屈曲,立柱腹板有压槽,压槽的影响包括:泊松比效应有一定的释放;腹板中面展开宽度增加,削弱了横向抗弯刚度;压槽作为腹板的单侧加劲肋,其抗弯刚度的计算具有一个特点,即压槽上的压力是板件压力的一部分,基于上述特定情况建立了屈曲分析的总势能,采用能量法得到了局部屈曲临界应力,可用于判断截面的局部屈曲承载力和截面分类。货架立柱的翼缘则发生畸变屈曲,畸变屈曲受到腹板对翼缘的转动约束,将新得到的腹板临界应力公式和腹板展开宽度纳入这个扭转约束的计算中,使计算结果更加符合货架立柱特点。计算结果表明:临界应力比不考虑凹槽影响的规范方法小5.6%~10.1%。
This study analyzes the local buckling of the webs and the distortional buckling of the cross-section in cold-formed rack columns.The web has a rolling groove,and its effects include:the release of the Poisson effect;a larger developed width which weakens the transverse bending stiffness;and the groove acting as a one-sided stiffenerfor the web,whose bending stiffness requires specific consideration in calculation,as the stress on the groove is part of the plate stress.The total potential for buckling analysis was formulated considering these effects.The energy method was used to obtain the local buckling stress of the grooved web,enabling the determination of the local buckling capacity and the classification of the sections.Distortional buckling occurs usually for the flange of the rack column,the flange is rotationally restrained by the web,the newly derived buckling stress for the web,together with the developed width,are used to determine the rotational restraint,leading to more rational approach for distortional analysis of the rack column,examples reveals that the proposed method has smaller buckling stresses,5.6%-10.9%smaller than neglecting the effect of the groove.
作者
童根树
Genshu Tong(Institute of High Performance Structures,Zhejiang University,Hangzhou310058,China)
出处
《钢结构(中英文)》
2025年第10期65-68,共4页
Steel Construction(Chinese & English)
关键词
货架立柱
局部屈曲
畸变屈曲
压槽
加劲肋
rack column
local buckling
distorsional buckling
rolling groove
stiffener
