This study investigated the change of weir structure performances when durability of concrete, which is the main material
of weir structure, decreased due to their aging by mean of seismic fragility analysis. In the analysis, it was assumed that the elastic
modulus of concrete was reduced by 10% in order to account for their aged deterioration. Additionally, the analysis of seismic fragility was
based on Monte Carlo Simulation method combined with a 2D nonlinear finite element in ABAQUS platform with the consideration
of deterioration of concrete. Finally, the comparison of seismic fragility of model pre- and post-deterioration was made to study the
performance of weir. Results show that the probability of failure in moderate damage for deteriorated model was found to be larger than
pre-deterioration model when peak ground acceleration (PGA) passed 0.4 g.
