摘要
为研究锈损对冷弯薄壁型钢短柱受压承载性能的影响,设计加工了6个轴压及6个绕强轴偏心受压短柱试件,首先通过拉伸试验,分析了材料力学性能与锈蚀程度间的关系,然后对试件进行承载力试验,分析其破坏模式、极限承载力及变形特征等特性,结果表明:锈损钢材的屈服、抗拉强度、弹性模量及伸长率均随锈蚀程度的增加呈线性下降趋势。锈损未使短柱试件的最终破坏模式发生变化,但随着偏心距的增大,试件由腹板局部屈曲变为以畸变屈曲为主的耦合破坏模式;在相同锈蚀率条件下,轴压试件的极限承载能力较偏压试件退化更明显。采用ABAQUS有限元软件对试件进行数值模拟,计算结果表明其能够较好的预测试件承载力及屈曲行为。
To investigate the effect of corrosion on the compressive bearing capacity of cold-formed thin-walled steel short columns, six specimens under axial compression and six specimens under eccentric compression around strong axes were designed and processed. First, the relationship between the mechanical properties of materials and the degree of corrosion was analyzed through tensile tests. Then, the bearing capacity tests of specimens were carried out, and the failure modes and ultimate load-bearing capacity were analyzed. The results show that the yield, tensile strength, modulus of elasticity and the elongation of corroded steel decrease linearly with the increase of corrosion degree. The corrosion of steel does not change the final failure mode of the short column specimens, but with the increase of eccentricity, the local buckling of the web becomes a coupling failure mode dominated by distortion buckling. Under the same corrosion rate, the ultimate bearing capacity of axially compressed specimens degrades more obviously than that of eccentrically compressed specimens. The ABAQUS finite element software was used to simulate the specimens. The results show that the ABAQUS software can better predict the bearing capacity and buckling behavior of the specimens.
作者
徐吉民
幸坤涛
高向宇
徐善华
郭小华
聂彪
XU Ji-min;XING Kun-tao;GAO Xiang-yu;XU Shan-hua;GUO Xiao-hua;NIE Biao(Central Research Institute of Building and Construction Co.Ltd,MCC Group,Beijing 100088,China;Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《工程力学》
EI
CSCD
北大核心
2021年第4期191-199,210,共10页
Engineering Mechanics
基金
“十三五”国家重点研发计划项目(2016YFC0701305)。
关键词
锈损
冷弯薄壁型钢
承载力试验
受压构件
失稳模式
corrosion
cold-formed thin-walled steel
bearing capacity test
compression member
buckling mode
