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In this paper, nonlinear time-history dynamic analyses of selected earthquakeground motions are conducted on designated wood-frame podium buildings and theresulting inter-story drifts are analyzed. We aim to construct a reliableregion where performance-based seismic design criteria are met, such that atwo-step analysis procedure can be used with high confidence. We develop akriging metamodel with tailored adaptive sampling methods to achieve this goalin a computationally efficient manner. The input variables we consider are thenormalized stiffness ratio and the normalized mass ratio of the podiumbuilding. We took a six-story wood frame built upon a one-story concrete podiumas a case study for our methodology, where our results indicate that thetwo-step analysis procedure may be used with high confidence if its normalizedstiffness ratio is at least 38 and its normalized mass ratio is between 0.5 and1.5.

A Kriging Metamodel with Adaptive Sampling for Seismic Evaluation of Podium Buildings