As a key point to examine the applicability of force response reduction due to uplift to non-slender buildings, the effect of rotational inertia on the dynamic uplifting behavior is investigated by means of classical modal analysis. The system considered is a two dimensional uniform shear-beam. Following eigenvalue analysis in the uplift phase, the free vibrations under gravity are investigated. The results show that the maximum force responses, e.g. base shears, etc., are significantly reduced, even if the rotational inertia is relatively large. But the force responses in non-slender buildings are a little bit larger than those in slender ones.
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