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Cyclic creep model of concrete based on Kelvin chain under fatigue loads
https://orcid.org/0000-0003-2970-4194
Abstract The underestimation of cyclic creep of concrete is one of the main causes of structural deformation that exceed prediction. In this study, a cyclic creep model of concrete based on Kelvin chain under sustained fatigue loads is proposed, with the consideration of the effect of fatigue damage. Strain additivity assumption is applied to consider the contribution of fatigue damage to elastic strain and creep strain. A Kelvin model is used to reproduce the creep behavior of concrete, and the rate-type creep constitutive equations are derived. The effect of fatigue damage on creep is based on the physical mechanism of microcracks propagation, and a fatigue damage model with the fracture energy release rate as the damage index is established. Based on the rate-type creep constitutive relation, an efficient numerical algorithm is developed to simulate the proposed model. Furthermore, the model is validated by comparing with experimental results, and some numerical examples are also presented, where the influences of stress level, stress amplitude and frequency are investigated. The results give confidences that the proposed model is capable of charactering the creep law of concrete under fatigue loads.
Highlights The effect of fatigue damage on creep and a fatigue damage model with the fracture energy release rate as the damage index are established. The rate-type cyclic creep constitutive equations based on Kelvin chain are derived. The applicability of the proposed model to concrete under static and fatigue loads is compared with the experimental data.
Cyclic creep model of concrete based on Kelvin chain under fatigue loads
https://orcid.org/0000-0003-2970-4194
Abstract The underestimation of cyclic creep of concrete is one of the main causes of structural deformation that exceed prediction. In this study, a cyclic creep model of concrete based on Kelvin chain under sustained fatigue loads is proposed, with the consideration of the effect of fatigue damage. Strain additivity assumption is applied to consider the contribution of fatigue damage to elastic strain and creep strain. A Kelvin model is used to reproduce the creep behavior of concrete, and the rate-type creep constitutive equations are derived. The effect of fatigue damage on creep is based on the physical mechanism of microcracks propagation, and a fatigue damage model with the fracture energy release rate as the damage index is established. Based on the rate-type creep constitutive relation, an efficient numerical algorithm is developed to simulate the proposed model. Furthermore, the model is validated by comparing with experimental results, and some numerical examples are also presented, where the influences of stress level, stress amplitude and frequency are investigated. The results give confidences that the proposed model is capable of charactering the creep law of concrete under fatigue loads.
Highlights The effect of fatigue damage on creep and a fatigue damage model with the fracture energy release rate as the damage index are established. The rate-type cyclic creep constitutive equations based on Kelvin chain are derived. The applicability of the proposed model to concrete under static and fatigue loads is compared with the experimental data.
Cyclic creep model of concrete based on Kelvin chain under fatigue loads
https://orcid.org/0000-0003-2970-4194
Abstract The underestimation of cyclic creep of concrete is one of the main causes of structural deformation that exceed prediction. In this study, a cyclic creep model of concrete based on Kelvin chain under sustained fatigue loads is proposed, with the consideration of the effect of fatigue damage. Strain additivity assumption is applied to consider the contribution of fatigue damage to elastic strain and creep strain. A Kelvin model is used to reproduce the creep behavior of concrete, and the rate-type creep constitutive equations are derived. The effect of fatigue damage on creep is based on the physical mechanism of microcracks propagation, and a fatigue damage model with the fracture energy release rate as the damage index is established. Based on the rate-type creep constitutive relation, an efficient numerical algorithm is developed to simulate the proposed model. Furthermore, the model is validated by comparing with experimental results, and some numerical examples are also presented, where the influences of stress level, stress amplitude and frequency are investigated. The results give confidences that the proposed model is capable of charactering the creep law of concrete under fatigue loads.
Highlights The effect of fatigue damage on creep and a fatigue damage model with the fracture energy release rate as the damage index are established. The rate-type cyclic creep constitutive equations based on Kelvin chain are derived. The applicability of the proposed model to concrete under static and fatigue loads is compared with the experimental data.
Cyclic creep model of concrete based on Kelvin chain under fatigue loads
Wang, Yuwei (author) / Pan, Zuanfeng (author) / Zeng, Bin (author) / Xu, Qing (author)
2024-01-28
Article (Journal)
Electronic Resource
English
Cyclic creep model of concrete based on Kelvin chain under fatigue loads
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