科研之友
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摘要
In order to perform a comprehensive study on the fatigue process of concrete structures, a novel analysis method was proposed. In this method, fatigue degradation of concrete material was characterized by an introduced fatigue damage constitutive model. To enhance the efficiency of fatigue analysis, a speeding calculation method, namely the cycle jump method, was developed by combining the constitutive model with the nonlinear finite element method, based on which, only few loading cycles need to be calculated to gain the whole fatigue process of concrete structures. In addition, a self-adaptive accuracy controlling method was developed, in which the jumping time can be automatically adjusted based on damage evolution rate. Through the analytical method proposed in this paper, the nonlinear behaviour, especially the cracking process of concrete structures under fatigue loading, can be well predicted. A set of simulations and experimental comparisons are presented, which illustrates the effectiveness of the model and high efficiency of the numerical algorithm in the analysis of the fatigue process of concrete structure.
