[周先雁] College of Civil Engineering, Architecture and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China;[曹国辉] Civil Engineering College, Hunan City University, Yiyang 413000, China
College of Civil Engineering, Architecture and Mechanics, Central South University of Forestry and Technology, China
[Liu, Xiao-Fang; Cao, Guo-Hui; Liu, Xiang-Rong; He, Ran] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
4th International Symposium on Lifetime Engineering of Civil Infrastructure
OCT 26-28, 2009
Changsha, PEOPLES R CHINA
[Cao, Guo-Hui;He, Ran;Liu, Xiao-Fang;Liu, Xiang-Rong] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
Concrete columns;creep;ultimate strength
Long-term mechanical properties test for 864 days were completed on three types column, including plain concrete(PC), reinforced concrete(RC) and concrete-filled steel tube(CFST) columns, the creep performance and ultimate strength were tested and analyzed. Creep test results show that reinforcement can significantly reduce the creep deformation of concrete columns. The creep coefficient of steel pipe surface is larger than that of inner concrete for CFST columns, it would last a long time for the creep of inner concrete to achieve stability. The ultimate strength test results show that loading age and reinforcement have great effect on extreme compression strain and ultimate strength of PC columns and RC columns. Whether it has loading course would influence the stress redistribution of CFST columns, the stress redistribution effect is relatively small for columns having loading course. However, whether it has loading course, the creep effect on the ultimate strength of CFST columns is very small.