摘要
为研究细长焊接圆钢管轴压稳定性能,对30根试件进了轴压试验,分析了试件失稳变形的特征,比较了试件的稳定系数与我国规范中稳定曲线的关系,并考虑钢管几何初始缺陷和残余应力对其稳定承载力进行了有限元分析。研究表明:细长焊接圆钢管的几何初始缺陷具有较大离散性,与我国规范规定值不同,正则化长细比在1.0~1.3区间时,试验得到的稳定系数低于规范值,最大相差-24.4%;几何初始缺陷小于1/500杆长时,可采用规范值进行设计;而几何初始缺陷大于1/500杆长时,建议重新制定压杆曲线。最后,给出了细长焊接圆钢管在8种初始缺陷下的压杆稳定曲线。
In order to study the stability of slender welded circular steel tube under axial compression,30 specimens were tested under axial compression.The characteristics of the instability deformation of the specimens were analyzed,and the relationship between the stability coefficient of the specimens and the stability curve in the Chinese code was compared.The finite element analysis of the stability bearing capacity was carried out considering the geometric initial defects and residual stress of the steel tube.The results show that the geometric initial defects of the slender welded circular steel tubes have a large discreteness,which are different from the values specified in the Chinese code.When the normalized slenderness ratio is in the range of 10~13,the stability coefficient obtained by the test is lower than the standard value,and the maximum difference is-244%.When the geometric initial defect is less than 1/500 rod length,the standard value can be used for design.When the geometric initial defect is greater than 1/500 rod length,it is recommended to re-establish the pressure bar curve.Finally,the stability curves of the slender welded circular steel tube under eight initial defects were given.
作者
林冰
张志超
张淏
丛峻
张磊
LIN Bing;ZHANG Zhichao;ZHANG Hao;CONG Jun;ZHANG Lei(China State Construction Corporation Limited Technical Center,Beijing 101300,China;China Construction Industrial Engineering and Technology Research Academy Co.,Ltd.,Beijing 101300,China;The Nalionmal Police Universily for Criminal Fustice,Baoding 071000,China)
出处
《建筑结构》
北大核心
2024年第14期61-68,共8页
Building Structure
基金
中国建筑股份有限公司科研课题(CSCEC-2020-Z-18)。
关键词
细长焊接圆钢管
稳定系数
轴压试验
设计方法
slender welded circular steel tube
stability coefficient
axial compression test
design method
