Numerical study of the effect of fatigue on impact performance of RC beams

Some existing concrete structures not only face threats of possible explosions and impact, but also suffer from long-term fatigue loads induced by traffic or vibration machines. Researchers have conducted extensive investigations on against highly dynamic load, e.g., blast impact. However, the damage performance deterioration flexural members due to cyclic throughout service life been considered in analysis loads. Studies proven that resulted degradation strength modulus elasticity (MoE), as well a reduction steel bars. The deteriorated materials caused residual capacity stiffness reinforced (RC) under quasi-static Therefore, ignoring effect may result an overestimation impact This study numerically investigates RC beams. grid section method (GSM) is proposed simulate beams with damage. GSM applied divide beam into compressive tensile zones assign MoE corresponding according stress level. Numerical models are established using LS-DYNA validated experimental results. different factors, including cycles, reinforcement ratio, strength, energy, behavior examined. Based results, correction take consideration estimation load.