Prediction of ground motion parameters in 1D ground response analysis

ABSTRACT: Ground motion parameters are used in various simplified seismic design procedures to represent the seismic hazard, such as the assessment of liquefaction, seismic slope stability, structural response, and the estimation of the damage potential of earthquakes. In practice, these can be obtained from the results of ground response analyses. However, their assessment resulting from these procedures has not been widely investigated to date. In this study, equivalent-linear (EQL) and nonlinear (NL) 1D ground response analyses are conducted for a dataset of 5 sites and 89 ground motion recordings. The uncertainty in the prediction of 10 commonly used ground motion parameters evaluated at the ground surface is quantified and compared. The findings of this study reveal a tendency towards the over-prediction of most of these parameters. It was found that one of the parameters, the mean period Tm, yielded the lowest bias and variability compared to the other measures.