Kinematic Soil-Structure Interaction from Strong Motion Recordings
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 129, Issue 4
Abstract
Earthquake strong motion recordings from 29 sites with instrumented structures and free-field accelerographs are used to evaluate variations between foundation-level and free-field ground motions. The focus of the paper is on buildings with surface and shallowly embedded foundations. The foundation/free-field ground motion variations are quantified in terms of frequency-dependent transmissibility function amplitude |H|. Procedures are developed to fit to |H| analytical models for base slab averaging for the assumed conditions of a rigid base slab and a vertically propagating, incoherent incident wave field characterized by ground motion incoherence parameter κ. The limiting assumptions of the model are not strictly satisfied for actual structures, and the results of the identification are apparent κ values (denoted that reflect not only incoherence effects, but also possible foundation flexibility and wave inclination effects. Nonetheless, a good correlation is found between values and soil shear wave velocity for sites with stiff foundation systems. Based on these results, recommendations are made for modifying free-field ground motions to estimate base slab motions for use in response analyses of buildings.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 129 • Issue 4 • April 2003
Pages: 323 - 335
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Feb 25, 2000
Accepted: Aug 6, 2002
Published online: Mar 14, 2003
Published in print: Apr 2003
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