Torsional Response of Symmetric Structures

Abstract

The torsional response of a one‐story, 1/11 scale model to ambient and steady‐state incident wave motion is measured at various depths of foundation embedment. Two modes of response are found. Modal frequencies and displacement ratios exhibit a qualitative dependence on embedment that is consistent with the additional restraint of the foundation. Lumped parameter analysis, using a two degree of freedom system that includes soil‐foundation interaction effects, is used to predict the lower mode response.