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Response and Modeling of Steel Tubes Filled with Recycled Fine and Coarse Aggregate Concretes under Long-Term Loading
| 题名： | Response and Modeling of Steel Tubes Filled with Recycled Fine and Coarse Aggregate Concretes under Long-Term Loading |
| 正文语种： | eng |
| 作者： | Zhao, Mu-Zi;Wang, Yu-Yin;Lehman, Dawn E.;Geng, Yue;Roeder, Charles W. |
| 作者单位： | Harbin Inst Technol Sch Civil Engn Minist Educ Key Lab Struct Dynam Behav & Control 73 Huanghe Rd Harbin 150090 Peoples R China;Harbin Inst Technol Sch Civil Engn 73 Huanghe Rd Harbin 150090 Peoples R China;Univ Washington Dept Civil & Environm Engn 204 More Hall Seattle WA 98195 USA;Harbin Inst Technol Sch Civil Engn 73 Huanghe Rd Harbin 150090 Peoples R China;Univ Washington Dept Civil & Environm Engn 204 More Hall Seattle WA 98195 USA |
| 关键词： | Concrete-filled steel tube;Coarse recycled aggregate (CRA);Fine recycled aggregate (FRA);Compounding effect;Time effect;Long-term deformation |
| 摘要： | The engineering properties of concrete with recycled aggregates (RAC) can vary more widely than normal aggregate concretes (NAC). Because concrete-filled steel tubes do not rely solely on the concrete in compression, using RAC in a concrete-filled steel tube (RACFST) is a sustainable structural solution. Most work has focused on using only coarse recycled aggregate (CRA), but with virgin sand supplies decreasing, there is a need to use fine recycled aggregate (FRA). Meanwhile, the long-term deformation of RACFST may be notably affected by FRA. A research program was undertaken to investigate the impact of FRA on the time-dependent behavior for the RACFST. Study parameters included CRA replacement ratio (r(C)), FRA replacement ratio (r(F)), and concrete strength (f(cm)). The experimental results showed that the FRA and CRA had a modest compounding effect (i.e., the FRA effect depends on r(C)) in RACFST, but this effect can be more pronounced for lower-strength concretes. Using RAC increases the scatter in the deformability but does not affect the rate of creep development. A creep model for NAC was then modified to predict the long-term deformation of RACFST. A parametric study was carried out to evaluate the time-dependent effects of the RACFST with other untested parameters. (C) 2021 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 147 |
| 期： | 11 |
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