ABSTRACT
The benefit of using the CGM legacy motions is that prior experience with these motions provides confidence in reproducibility of the ground motion. Researchers can be confident, for example, that they will achieve a given target motion in their model, and thus they are able to predict response during the experiment. Furthermore, reproducibility means that the researcher can compare the current experimental results with results from previous tests. The primary shortcoming of only using these legacy motions is the potential of missing important phenomena that occur in different realistic earthquake scenarios. Furthermore, any single recorded earthquake motion has unique characteristics and too much reliance on one motion might bias the results of the testing program. It is preferable to use a mix of legacy motions and new ground motions for centrifuge testing when possible. In this way, comparisons with previous research are possible, bias can be minimized, and potentially new fundamental insights can be realized.
