摘要
目的提出一种适用于轻钢厂房或大跨房屋的缀条式双肢梯形薄钢格构柱,并研究其轴心受压承载性能。方法采用ABAQUS有限元软件对梯形截面双肢格构柱数值模型进行非线性分析,研究构件的应力发展趋势和破坏机理,分析柱高和分肢腹板高度参数对格构柱轴压承载力的影响机制,并采用现行规范有效宽度法对构件进行极限承载力计算分析。结果随着柱高增加,格构柱由强度破坏转为整体失稳破坏,同时伴有斜卷边畸变屈曲耦合破坏,轴压承载力下降速度先快后慢;随着腹板高度增加柱由绕实轴失稳转为绕虚轴失稳,承载力先增大后减小;规范计算值对腹板高度在80~120 mm时,结果偏于安全;腹板高度为140 mm时,结果偏不安全。结论双肢梯形薄钢格构柱的截面形式布置灵活,轴压承载力较高;薄钢格构柱的分肢腹板高度取100~120 mm为宜;建议修正稳定系数φ,得出适用于双肢梯形冷弯薄钢格构柱的承载力计算公式。
This paper proposed a laced double limbs thin steel trapezoid lattice column suitable for light steel factories or large-span buildings,and studied its axial compression performance.The finite element software ABAQUS was used to perform nonlinear analysis on the numerical model of the double limbs lattice column with trapezoidal section.The stress development and failure mechanism of the constructs were studied.The influence mechanism of column height and web height on axial compression capacity of the lattice columns was analyzed.The effective width method of the current code was used to calculate and analyze the ultimate bearing capacity of the constructs.With the increase of the column height,the failure mode of lattice column turned from strength to overall instability,accompanied by distortional buckling failure of oblique edge,and the speed of axial compression capacity decreased quickly and then slowly.With the increase of web height,the columns turned from instability around the real axis to instability around the imaginary axis,and the bearing capacity firstly increased and then decreased.The code calculated value was safe when the web height was in the range of 80~120 mm,whereas the result was not safe when the web height was at 140 mm.The section form of the double limbs thin steel trapezoid lattice columns was flexible,and the axial compression capacity was relatively high.The preferable web height of the thin steel lattice column was in the range of 100~120 mm.It is recommended to modify the stability factorφto obtain the calculation formulas for the bearing capacity of the double limbs thin steel trapezoid lattice columns.
作者
金路
钱晶晶
徐冬
张飞扬
陈强
JIN Lu;QIAN Jingjing;XU Dong;ZHANG Feiyang;CHEN Qiang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;The Fourth Construction Engineering Co.Ltd.,China Construction Second Engineering Bureau,Tianjin,China,300457)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第2期218-226,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51978422)。
关键词
双肢格构柱
冷弯薄钢
轴压承载力
整体稳定
缀条
double limbs lattice column
cold formed thin steel
axial compression capacity
overall stability
lacing bar
