Estimating Seismic Demands for Isolation Bearings with Building Overturning Effects
Publication: Journal of Structural Engineering
Volume 132, Issue 7
Abstract
An earlier procedure that estimates the peak deformation in base-isolated buildings is extended to include overturning and thereby estimate the peak axial forces in individual isolators. Such tools can be used as part of a design procedure to predict and subsequently eliminate bearing tension by modifying the design. The procedure is based on nonlinear response history analysis of an isolated block using an advanced bearing model that incorporates the relation between axial load and bearing response, known as axial-load effects. Rocking of the structure and bearing axial-load effects are found to have little influence on the peak lateral bearing deformation; median response spectra are within 10% of those when rocking is neglected entirely. Furthermore, bearing axial-load effects can usually be neglected in determining the maximum and minimum bearing axial forces; cases are identified where the error in neglecting such effects exceed 10%. Because the structure has been modeled as rigid, the limitations of the procedure should be assessed for superstructure designs that allow significant structural deformation.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 7 • July 2006
Pages: 1118 - 1128
Copyright
© 2006 ASCE.
History
Received: Nov 5, 2004
Accepted: Jul 28, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
Notes
Note. Associate Editor: Sashi K. Kunnath
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