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| Stochastic fatigue damage model for concrete based on energy dissipation analysis |
| Received:May 25, 2023 Revised:July 20, 2023 |
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| DOI：10.7511/jslx20230525002 |
| KeyWord:concrete fatigue constitutive model stochastic damage |
| Author | Institution |
| 虢成功 |
同济大学 土木工程学院, 上海 |
| 李杰 |
同济大学 土木工程学院, 上海 |
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| Abstract: |
| In this work,a new stochastic concrete fatigue damage model is developed based on the micro-meso stochastic fracture model (MMSF).The micro-spring in the MMSF is regarded as an energy dissipation unit,and the multiscale energy dissipation process within it is investigated.At the nanoscale,the rate process theory is introduced to describe the crack expansion rate,and the scale gap between the nanoscale and the microscale is connected by a crack hierarchy model.Thus,the energy dissipation expression of microsprings under fatigue loading is established.To consider the interactions of multiple cracks,a fatigue damage function,including a damage acceleration effect and a damage healing effect,is introduced to modify the energy dissipation expression.By comparing the numerical simulation with the relevant test data,it is demonstrated that the proposed model can reflect the main mechanical behaviors of concrete under fatigue loading,including the three stages of fatigue damage,the scatter in the data of fatigue life,and the influence of loading frequency. |
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