细长焊接圆钢管轴心受压稳定承载力研究
Study on stability and bearing capacity of slender welded circular tube under axial compression
林冰 1张志超 1张淏 2丛峻 1张磊1
作者信息
- 1. 中建工程产业技术研究院有限公司,北京 101300;中国建筑股份有限公司技术中心,北京 101300
- 2. 中央司法警官学院,保定 071000
- 折叠
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.
Abstract
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 1.0～1.3,the stability coefficient obtained by the test is lower than the standard value,and the maximum difference is-24.4％.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.
关键词
细长焊接圆钢管/稳定系数/轴压试验/设计方法Key words
slender welded circular steel tube/stability coefficient/axial compression test/design method引用本文复制引用
基金项目
中国建筑股份有限公司科研课题(CSCEC-2020-Z-18)
出版年
2024
NETL
NSTL
万方数据