摘要
采用ABAQUS有限元分析软件,通过合理选用材料本构、单元类型、网格划分和边界条件,建立了考虑核心混凝土均匀脱空的方钢管混凝土短柱的有限元分析模型,并采用试验结果进行验证。利用通过验证的有限元模型对带脱空缺陷的方钢管混凝土短柱的轴压性能进行研究,分析带脱空方钢管混凝土短柱的破坏形态、荷载-变形关系、钢管与混凝土的内力分配和界面接触应力,研究脱空对其受力性能的影响。结果表明:当混凝土脱空率小于0.1%时,方钢管混凝土轴压构件的承载力降低值小于5%,脱空的影响较小;当脱空率超过0.4%时,钢管与核心混凝土在构件达到轴压承载力前的相互作用基本不存在,两者分别受力、各自破坏。
By using ABAQUS software,a finite element model was established based on proper constitutive law of material,element type,meshing technology,and boundary condition. After being verified,the finite element model was used to study the axial performance of concrete-filled steel tubular( CFST) square short columns with a circumferential gap. Based on the computed results,failure mode,load-deformation relationship,internal force distribution and contact stress of the models were analyzed,and the influence of the gap on the mechanical performance of CFST square short columns was investigated. Analytical results show that,when the gap ratio is smaller than 0. 1%,the influence of the gap is unobvious,while the steel tube and the core concrete will act and fail separately when the gap ratio exceeds 0. 4%.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第S1期324-329,共6页
Journal of Building Structures
基金
中国博士后科学基金项目(2015M571044)
关键词
方钢管混凝土短柱
脱空
有限元分析
轴压性能
square concrete-filled steel tubular column
gap
finite element analysis
axial performance
