Acceleration Algorithm for Whole Fatigue Damage Process Simulation of Concrete

Abstract:

The cycle jump acceleration algorithm is improved based on the stochastic fatigue damage constitutive model in this paper. The extrapolation variable is changed from the damage variable to the energy dissipation variable. Then， the effects of the jump threshold and extrapolation mode on the calculation results of the acceleration algorithm are analyzed. When choosing appropriate jump thresholds， the improved acceleration algorithm can provide more accurate extrapolation variable information with less cycle-by-cycle calculation. As a result， the whole fatigue damage process simulation of concrete is more accurate and requires less computation. By employing the improved acceleration algorithm， the fatigue damage process of a plain concrete beam under compression is simulated. It is shown that the improved acceleration algorithm can simulate the whole fatigue failure process of concrete structures properly and effectively.