Abstract
This paper presents a new insight into the nonlinearity of secant stiffness degradation of concrete under fatigue loading by employing a recently-proposed damage model. It is revealed that the nonlinearity is resulted from a deceleration mechanism and an acceleration mechanism, which are attributed to the randomness of a material parameter termed nano-to-micro comprehensive fracture energy and the evolution of damage energy release rate caused by stress redistribution, respectively. Based on test data, it is deduced that the deceleration mechanism prevails in the early 40% and the acceleration mechanism dominates in the late 60% of fatigue life of concrete.
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