Dynamic response analysis of solitary flexible rocking bodies: modeling and behavior under pulse-like ground excitation

SUMMARY Results obtained for rigid structures suggest that rocking can be used as seismic response modification strategy. However, actual structures are not rigid: structural elements where rocking is expected to occur are often slender and flexible. Modeling of the rocking motion and impact of flex...

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Bibliographic Details
Published in:Earthquake engineering & structural dynamics 2014-08, Vol.43 (10), p.1463-1481
Main Authors: Vassiliou, Michalis F., Mackie, Kevin R., Stojadinović, Božidar
Format: Article
Language:English
Subjects:
Computer programs
Earth sciences
Earth, ocean, space
Earthquakes, seismology
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
Excitation
fem modelling
Finite element method
Ground motion
Internal geophysics
Mathematical analysis
Mathematical models
overturning stability
rocking structures
Seismic response
Software
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Summary:SUMMARY Results obtained for rigid structures suggest that rocking can be used as seismic response modification strategy. However, actual structures are not rigid: structural elements where rocking is expected to occur are often slender and flexible. Modeling of the rocking motion and impact of flexible bodies is a challenging task. A non‐linear elastic viscously damped zero‐length spring rocking model, directly usable in conventional finite element software, is presented in this paper. The flexible rocking body is modeled using a conventional beam‐column element with distributed masses. This model is verified by comparing its pulse excitation response to the corresponding analytical solution and validated by overturning analysis of rocking blocks subjected to a recorded ground motion excitation. The rigid rocking block model provides a good approximation of the seismic response of solitary flexible columns designed to uplift when excited by pulse‐like ground motions. Guidance for development of rocking column models in ordinary finite element software is provided. Copyright © 2014 John Wiley & Sons, Ltd.
ISSN:0098-8847
1096-9845
DOI:10.1002/eqe.2406