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Strain recovery model for concrete after compressive creep
https://orcid.org/0000-0001-9953-3496
Highlights A multi-coefficient creep-recovery model of concrete has been proposed and verified. A mathematical expression of initial-recovery strain has been proposed. The effects of loading age, load duration, concrete strength, and load level on initial-recovery have been investigated. The effects of creep strain, loading age, load duration, and concrete strength on creep-recovery have been investigated.
Abstract The research objective of this study is to examine the strain recovery of concrete after compressive creep. First, the influences of concrete strength, load duration, and stress-strength ratio at loading time on the initial-recovery are investigated on 128 concrete prisms. The concrete strength, loading age, and load duration have no clear influence on the initial-recovery strain coefficient (the ratio of initial-recovery strain to initial strain) when the concrete age concrete is over 28 d and load duration is over 41 d, but the initial-recovery strain coefficient decreases as the stress-strength ratio at loading time increases. Moreover, the effects of loading age, load duration, and concrete strength on creep-recovery are investigated by examining data from tests and references. The basic creep-recovery model is obtained by fitting the creep-recovery experimental data from 28 concrete prisms. Then, a multi-coefficient creep-recovery model for concrete that considers the influence of creep, loading age, load duration, and concrete strength is proposed. Finally, the proposed creep-recovery model is verified with reference data, with better performance than the existing creep-recovery models.
Strain recovery model for concrete after compressive creep
https://orcid.org/0000-0001-9953-3496
Highlights A multi-coefficient creep-recovery model of concrete has been proposed and verified. A mathematical expression of initial-recovery strain has been proposed. The effects of loading age, load duration, concrete strength, and load level on initial-recovery have been investigated. The effects of creep strain, loading age, load duration, and concrete strength on creep-recovery have been investigated.
Abstract The research objective of this study is to examine the strain recovery of concrete after compressive creep. First, the influences of concrete strength, load duration, and stress-strength ratio at loading time on the initial-recovery are investigated on 128 concrete prisms. The concrete strength, loading age, and load duration have no clear influence on the initial-recovery strain coefficient (the ratio of initial-recovery strain to initial strain) when the concrete age concrete is over 28 d and load duration is over 41 d, but the initial-recovery strain coefficient decreases as the stress-strength ratio at loading time increases. Moreover, the effects of loading age, load duration, and concrete strength on creep-recovery are investigated by examining data from tests and references. The basic creep-recovery model is obtained by fitting the creep-recovery experimental data from 28 concrete prisms. Then, a multi-coefficient creep-recovery model for concrete that considers the influence of creep, loading age, load duration, and concrete strength is proposed. Finally, the proposed creep-recovery model is verified with reference data, with better performance than the existing creep-recovery models.
Strain recovery model for concrete after compressive creep
https://orcid.org/0000-0001-9953-3496
Highlights A multi-coefficient creep-recovery model of concrete has been proposed and verified. A mathematical expression of initial-recovery strain has been proposed. The effects of loading age, load duration, concrete strength, and load level on initial-recovery have been investigated. The effects of creep strain, loading age, load duration, and concrete strength on creep-recovery have been investigated.
Abstract The research objective of this study is to examine the strain recovery of concrete after compressive creep. First, the influences of concrete strength, load duration, and stress-strength ratio at loading time on the initial-recovery are investigated on 128 concrete prisms. The concrete strength, loading age, and load duration have no clear influence on the initial-recovery strain coefficient (the ratio of initial-recovery strain to initial strain) when the concrete age concrete is over 28 d and load duration is over 41 d, but the initial-recovery strain coefficient decreases as the stress-strength ratio at loading time increases. Moreover, the effects of loading age, load duration, and concrete strength on creep-recovery are investigated by examining data from tests and references. The basic creep-recovery model is obtained by fitting the creep-recovery experimental data from 28 concrete prisms. Then, a multi-coefficient creep-recovery model for concrete that considers the influence of creep, loading age, load duration, and concrete strength is proposed. Finally, the proposed creep-recovery model is verified with reference data, with better performance than the existing creep-recovery models.
Strain recovery model for concrete after compressive creep
Chen, Pang (author) / Zheng, Wenzhong (author) / Wang, Ying (author) / Du, Kunmao (author) / Chang, Wei (author)
Construction and Building Materials ; 199 ; 746-755
2018-12-14
10 pages
Article (Journal)
Electronic Resource
English
<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>t</mi> <mn>0</mn></msub></math> , concrete age at loading time (days) , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Δ</mi> <mi>t</mi></mrow></math> , load duration time (days) , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>E</mi> <mtext>c</mtext></msub> <mfenced><mrow><msub><mi>t</mi> <mn>0</mn></msub></mrow></mfenced></mrow></math> , elastic modulus at loading time , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>f</mi> <mtext>c</mtext></msub></math> , compressive strength of concrete at loading time , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>ε</mi> <mtext>i</mtext></msub></math> , initial strain at loading time , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>ε</mi> <mrow><mi>ir</mi></mrow></msub></math> , initial-recovery strain , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mrow><mi>ε</mi></mrow> <mo>∗</mo></msup> <mfenced><mrow><mi>t</mi></mrow></mfenced></mrow></math> , creep-recovery strain at time <italic>t</italic> , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>λ</mi> <mn>1</mn></msub></math> , Initial-recovery coefficient (the ratio between initial-recovery strain and initial strain) , <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>η</mi></math> , Stress-strength ratio at loading time , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>γ</mi> <msub><mi>t</mi> <mn>0</mn></msub></msub></math> , loading age influence coefficient on creep-recovery , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>t</mi> <mn>1</mn></msub></math> , concrete age at unloading time (days) , <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>t</mi></math> , time after concrete unloading (days) , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>E</mi> <mtext>c</mtext></msub> <mfenced><mrow><msub><mi>t</mi> <mn>1</mn></msub></mrow></mfenced></mrow></math> , elastic modulus at unloading time , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>f</mi> <mtext>c,28</mtext></msub></math> , 28d compressive strength of concrete , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>ε</mi> <mtext>c</mtext></msub></math> , creep strain , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>ε</mi> <mtext>cr</mtext></msub></math> , creep-recovery strain , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>σ</mi> <mi>c</mi></msub></math> , sustain compressive stress , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>λ</mi> <mn>2</mn></msub></math> , Creep-recovery coefficient (the ratio between creep-recovery strain and creep strain) , γ<inf>t</inf> , concrete strength influence coefficient on creep-recovery , γ<inf>Δt</inf> , load holding duration influence coefficient on creep-recovery , Concrete creep , Initial-recovery strain , Creep-recovery strain , Mathematical model , Influence coefficient
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