Approximate Floor Acceleration Demands in Multistory Buildings. II: Applications
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Volume 131, Issue 2
Abstract
The accuracy of an approximate method to estimate floor acceleration demands in multistory buildings responding elastically or practically elastic when subjected to earthquake ground motion is investigated. Modal analysis is used in combination with approximate dynamic characteristics computed using a simplified continuous model that is fully defined with only four parameters. The accuracy of the method is first evaluated by comparing the response computed with the approximate method to that computed with response history analyses of complete finite element models of two generic buildings available in the literature. A comparison of exact and approximate dynamic characteristics is presented. Approximate peak floor acceleration demands and its variation along the height of the buildings are compared to exact demands when the buildings are subjected to an ensemble of 20 ground motions. The accuracy of the method is then evaluated by comparing floor acceleration demands computed with the approximate method to those recorded in four instrumented buildings in California. Results show that the approximate method produces good results with a very small computational effort.
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Acknowledgments
This work was supported by the Pacific Earthquake Engineering Research (PEER) Center with support from the Earthquake Engineering Research Centers Program of the National Science Foundation under Award No. EEC-9701568. This financial support to the writers is gratefully acknowledged. Ground and structural motions used in this investigation were obtained from the California Strong Motion Instrumentation Program of the California Geological Survey and from the United States Geological Survey. Efforts to install, operate and maintain seismic instrumentation as well as to process and disseminate earthquake records by these organizations are acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 2 • February 2005
Pages: 212 - 220
Copyright
© ASCE.
History
Received: Jul 18, 2003
Accepted: Apr 20, 2004
Published online: Feb 1, 2005
Published in print: Feb 2005
Notes
Note. Associate Editor: Gregory A. MacRae
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