Dynamic Response Reduction of Cantilevered Columns by Anchored Constrained Viscoelastic Layer Treatments

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 1/5-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. © 2012 American Society of Civil Engineers.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Anchored Constraining Layer; Constrained-Layer Treatment; Distributed Damping; Distributed Mass System; Structural Dynamics; Viscoelastic Layers; Civil Engineering; Dynamic Response; Civil Engineering; Column; Harmonic Analysis

International Standard Serial Number (ISSN)

0733-9399

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Jul 2011

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