东南大学学报（英文版）2021，Vol.37Issue(1)：52-58,7.DOI:10.3969/j.issn.1003-7985.2021.01.007
考虑混凝土徐变和收缩影响的钢管混凝土柱膨胀与自应力性能
Expansion performance and self-stressing behavior of CFST columns considering concrete creep and shrinkage effect
摘要
Abstract
Expansive concrete is used in the steel tube of Concrete-filled steel tubular(CFST)columns to solve the problem of steel-to-concrete debonding.Self-stress is generated between concrete and steel plate due to concrete expansion,which can effectively improve the mechanical performance of CFST columns.Deformation tests were conducted on concrete and CFST columns,respectively.The free deformation of concrete and circumferential deformation of steel tubes were measured and analyzed.A calculation method was proposed to evaluate the hoop strain,self-stress and creep deformation of the CFST columns.The test and calculation results indicate that the proper addition of expansion agent in the internal concrete can keep concrete expansive and generate self-stresses for a long time.The expansion and self-stresses prevent the debonding between the steel tube and the internal concrete.Increasing the dosage of expansive agents and reducing the curing age both increase the expansive deformation and self-stress of CFST columns.Increasing the tube thickness reduces the expansive deformation and increases the initial self-stress of CFST columns.关键词
钢管混凝土/膨胀变形/自应力/徐变Key words
concrete-filled steel tubular(CFST)/expansive deformation/self-stress/creep分类
建筑与水利引用本文复制引用
许荔,曾昊,潘金龙..考虑混凝土徐变和收缩影响的钢管混凝土柱膨胀与自应力性能[J].东南大学学报（英文版）,2021,37(1):52-58,7.基金项目
The National Key R&D Program of China(No.2017YFC0703705),the National Natural Science Foundation of China(No.51778183),Jiangsu Planned Projects for Postdoctoral Research Funds(No.2020Z088). （No.2017YFC0703705）
