Dynamic Response Reduction of Cantilevered Columns by Anchored Constrained Viscoelastic Layer Treatments
Publication: Journal of Engineering Mechanics
Volume 138, Issue 1
Abstract
This paper proposes a new constrained viscoelastic (VE) layer treatment as a distributed supplemental damping mechanism for structural members. A steady-state solution of a cantilevered column utilizing this system is formulated under harmonic loading and validated with experimental shake table tests. Parametric studies indicated that the new treatment can reduce the elastic response of a -scale square column up to 20%, or increase the damping ratio of the column from 2% to 2.5%. They remain effective as the column begins rocking at the column-footing construction joint. The numerical results were found to be in general agreement with the shake table test data of two column specimens with and without VE layers. On the basis of the validated model, applying two VE layers of 2.38 mm-thick to cover the lower 50–90% height of a cantilevered column appears the most efficient, and can increase the damping ratio up to 12% for a full-scale column. The significant reduction in peak responses indicates that the proposed new constrained-layer system is promising for civil engineering applications.
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Acknowledgments
Financial support to complete this study were provided in part by Federal Highway Administration under Cooperative Agreement No. FHADTFH61-02-X-00009 and National Science Foundation under Nos. NSFCMS9733123 and NSFCMMI103039. The findings and opinions expressed in this paper are those of the authors only. They do not necessarily represent those of the sponsors.
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Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 1 • January 2012
Pages: 12 - 21
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Nov 30, 2008
Accepted: Jul 6, 2011
Published online: Jul 8, 2011
Published in print: Jan 1, 2012
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