2009 Volume 74 Issue 640 Pages 1055-1061
Dynamic behavior of buildings allowed to uplift is investigated by means of classical modal analysis of a uniform shear-beam model on a rigid ground. The equations of motion are derived and eigenproblem is solved to investigate the modal properties during uplift. Free vibration under gravity during the first excursion of uplift is analyzed to show the responses of transient uplift behavior. In addition to the confirmation of significant reduction effect, it is pointed out from the results that the relatively complicated uplift responses at a glance can be recognized as natural consequences of higher modes' properties and their behaviors.
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