Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model
The study of short-term creep is essential for understanding the concrete creep process and deformation under alternating stress. Researchers are concentrating on the nano- and micron-scale creep of cement pastes. In the latest RILEM creep database, short-term concrete creep data at hourly or minute...
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| Format: | Article |
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MDPI AG
2023-06-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/12/4274 |
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| author | Shengqi Mei Xufeng Li Xingju Wang Xiaodong Liu |
| author_facet | Shengqi Mei Xufeng Li Xingju Wang Xiaodong Liu |
| author_sort | Shengqi Mei |
| collection | DOAJ |
| description | The study of short-term creep is essential for understanding the concrete creep process and deformation under alternating stress. Researchers are concentrating on the nano- and micron-scale creep of cement pastes. In the latest RILEM creep database, short-term concrete creep data at hourly or minutely levels are still rare and scarce. In order to describe the short-term creep and creep-recovery behavior of concrete specimens more accurately, the short-term creep and creep-recovery experiments were carried out firstly. The load-holding time varied from 60 s to 1800 s. Secondly, the accuracy of current creep models (B4, B4s, MC2010, and ACI209) in predicting the short-term creep of concrete was compared. It was discovered that the B4, B4s, and MC2010 models all overestimate concrete’s short-term creep, and the ACI model does the opposite. Thirdly, the applicability of the fractional-order-derivative viscoelastic model (with a derivative order between 0 and 1) in the calculation of the short-term creep and creep recovery of concrete is investigated. The calculation results show that the fractional-order derivatives are more suitable for analyzing the static viscoelastic deformation of concrete while the classical viscoelastic model requires a large number of parameters. Therefore, a modified fractional-order viscoelastic model is proposed considering the residual deformation characteristics of concrete after unloading, and the values of the model parameters under different conditions are given with the experimental data. |
| first_indexed | 2024-03-11T02:12:05Z |
| format | Article |
| id | doaj.art-15084a539ecf400693bc7e8fd3c119a5 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T02:12:05Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-15084a539ecf400693bc7e8fd3c119a52023-11-18T11:23:56ZengMDPI AGMaterials1996-19442023-06-011612427410.3390/ma16124274Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic ModelShengqi Mei0Xufeng Li1Xingju Wang2Xiaodong Liu3State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, ChinaSchool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, ChinaSchool of Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, ChinaSchool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, ChinaThe study of short-term creep is essential for understanding the concrete creep process and deformation under alternating stress. Researchers are concentrating on the nano- and micron-scale creep of cement pastes. In the latest RILEM creep database, short-term concrete creep data at hourly or minutely levels are still rare and scarce. In order to describe the short-term creep and creep-recovery behavior of concrete specimens more accurately, the short-term creep and creep-recovery experiments were carried out firstly. The load-holding time varied from 60 s to 1800 s. Secondly, the accuracy of current creep models (B4, B4s, MC2010, and ACI209) in predicting the short-term creep of concrete was compared. It was discovered that the B4, B4s, and MC2010 models all overestimate concrete’s short-term creep, and the ACI model does the opposite. Thirdly, the applicability of the fractional-order-derivative viscoelastic model (with a derivative order between 0 and 1) in the calculation of the short-term creep and creep recovery of concrete is investigated. The calculation results show that the fractional-order derivatives are more suitable for analyzing the static viscoelastic deformation of concrete while the classical viscoelastic model requires a large number of parameters. Therefore, a modified fractional-order viscoelastic model is proposed considering the residual deformation characteristics of concrete after unloading, and the values of the model parameters under different conditions are given with the experimental data.https://www.mdpi.com/1996-1944/16/12/4274concrete creepultra-short load duration timeviscoelasticityfractional order calculus |
| spellingShingle | Shengqi Mei Xufeng Li Xingju Wang Xiaodong Liu Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model Materials concrete creep ultra-short load duration time viscoelasticity fractional order calculus |
| title | Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model |
| title_full | Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model |
| title_fullStr | Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model |
| title_full_unstemmed | Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model |
| title_short | Calculation of Short-Term Creep of Concrete Using Fractional Viscoelastic Model |
| title_sort | calculation of short term creep of concrete using fractional viscoelastic model |
| topic | concrete creep ultra-short load duration time viscoelasticity fractional order calculus |
| url | https://www.mdpi.com/1996-1944/16/12/4274 |
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