Deformation behavior of steel tube-confined concrete-filled steel tube columns under sustained axial compression

被引：0
|
作者：
Li Y. [1 ]
Zhang S. [1 ]
Wang Y. [1 ]
Wang Y. [1 ]
机构：
[1] Harbin Institute of Technology (Shenzhen), Civil and Environmental Engineering, Guangdong, Shenzhen
[2] Harbin Institute of Technology, School of Civil Engineering, Harbin
来源：
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2023年 / 55卷 / 09期
关键词：
concrete-filled steel tube; long-term loading; relative humidity; shrinkage and creep; steel tube confinement;
D O I：
10.11918/202112027
中图分类号：
学科分类号：
摘要：
Long-term tests under axial compression were carried out on 16 steel tube-confined concrete-filled steel tube columns and two concrete-filled steel tube columns for 350 d to investigate the long-term deformation performance. The main research parameters were stress ratio of the core concrete (0. 35, 0. 50, and 0. 65) , total steel ratio of the inner and outer steel tubes (5. 8% , 10. 5% , and 15. 0% ) , and the steel ratio between the inner and outer steel tubes (0. 30, 1. 25 , and 2. 23 ) . The working mechanism of the steel tube-confined concrete-filled steel tube columns under long-term axial compression was analyzed, and a theoretical calculation method for long-term deformation of steel tube-confined concrete-filled steel tube columns was established. Results show that the long-term deformation increased with the increase in the stress ratio of the core concrete, and decreased when the total steel ratio and the ratio between the inner and outer steel tubes increased. The comparison between the theoretical and test results shows that the long-term deformation increased with the decrease in relative humidity. When different concrete shrinkage and creep models were used, the influence of relative humidity varied, and the CEB-FIP 2010 model had the best performance. Therefore, the CEB-FIP 2010 model with 100% relative humidity is recommended for the calculation of steel tube-confined concrete-filled steel tube columns under long-term deformation. © 2023 Harbin Institute of Technology. All rights reserved.
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页码：101 / 110
页数：9
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