Evaluation of Parameters Affecting the Inelastic Acceleration Ratio

The Inelastic Acceleration Ratio (IAR) is a helpful instrument for determining the maximum inelastic acceleration from the related elastic acceleration that seems to have been little examined in past research. The IARs using single-degree-of-freedom (SDOF) systems with various structural factors under thirty pairs of ground motion earthquakes recorded are investigated in this paper. The linear elastic-perfect plastic model is used to model SDOF systems. The factors to consider include elastic vibration period (T), displacement ductility ratios (mu, 2-8), the post-yield stiffness ratio (alpha, 0-15%), and the damping ratio (xi, 3-20%). The results showed that the IAR values are decreased with an increase in the ductility ratios (mu) while the IAR values are increased with an increase in the damping ratios (xi). While the post-yield stiffness ratio (alpha) has little effect on the IAR. Also, Analytical formulae are used to estimate IAR based on the T, mu, alpha, and xi.