Rocking foundations have shown performance advantages that may benefit the seismic performance of structures. Previous centrifuge tests have well characterized the behavior of rectangular rocking foundations on sand, but few results are available for clayey ground. In this study a series of centrifuge model tests of shear walls and single-degree-of-freedom (SDOF) structures with rocking foundations supported on clay of medium strength are conducted. Vertical bearing failure, slow cyclic loading, and dynamic shaking tests were performed at three different levels of centrifugal acceleration. The moment capacity, settlement, and rotation of each loaded model were tracked and then compared to previous published results. The measured moment capacity is found to match the theoretical values. The settlement vs. rotation behavior was characterized, and it is found that settlement is somewhat smaller than previous results for similar models tested on sand.
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