Abstract
Abstract Dynamic shear modulus and damping ratio determination from random loading tests on dry Monterey and Ottawa sands in a resonant column device, in addition to sinusoidal loading, are presented. In the random excitation test, white noise was used to excite the specimens, and the responses of the specimens were analyzed by the random decrement technique. Using a sine-wave generator, the dynamic soil properties were also determined by the conventional technique. The results obtained indicated a good agreement between the modulus and damping obtained from the application of sinusoidal or random loading. It was concluded that the relationship of shear modulus and damping ratio with shear strain amplitude is independent of random or sinusoidal forcing functions within the range of variables tested.
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