Seismic Response of Rocking Oscillators on a Soft Story: Elastic Response
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Structural Engineering
Volume 141, Issue 8
Abstract
The elastic response of a class of nonlinear oscillators that represent structural systems with a relatively rigid superstructure on a soft ground story is evaluated under lateral base excitation. The governing equations of motion are developed, accounting for both lateral translation and overturning rocking of the rigid superstructure relative to the flexible ground story. In this work, the system parameters are identified initially for linear elastic response and, subsequently, in a companion publication, for the case of the base exhibiting nonlinear resistance–deformation characteristics. The dynamic coupling between lateral and rocking modes is evaluated under a base excitation for different system period and resistance parameters, and the deformation and force demands are compared with the single-degree-of-freedom lateral-response-only predictions, as typically considered in seismic design. It is shown that the presence of rocking of the rigid superstructure causes an increase in the transverse deformation demands compared with conventional spectral estimates using the single-degree-of-freedom approach.
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Journal of Structural Engineering
Volume 141 • Issue 8 • August 2015
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© 2014 American Society of Civil Engineers.
History
Received: Dec 10, 2013
Accepted: Jul 23, 2014
Published online: Sep 15, 2014
Discussion open until: Feb 15, 2015
Published in print: Aug 1, 2015
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