Wavelet-Based Evolutionary Response of Multispan Structures Including Wave-Passage and Site-Response Effects
Publication: Journal of Engineering Mechanics
Volume 140, Issue 8
Abstract
Stochastic seismic wavelet-based evolutionary response of multispan structures including wave-passage and site-response effects is formulated in this paper. A procedure to estimate site-compatible parameters of surface-to-bedrock frequency response function (FRF) by using finite-element analysis of the supporting soil medium is proposed. The earthquake energy content is represented by a composite power spectrum density function contributed by the surface-to-bedrock FRF and bedrock power spectra. A long span multisupport structure is subjected to spatially varying differential support motions where the spatial-variability is represented by bedrock parametric coherency models and time-lags. In addition to the time-lags from wave-passage effects, the site-response effects from different soil conditions at the supports are characterized by frequency-dependent time-lags. In an illustrative case study, a three-span, two-dimensional hangar frame is analyzed using the proposed formulations. The time-lags resulting from site-response effects and computed by different FRFs show different variation in trends and frequency content. The site-response effect is found to introduce additional frequency nonstationarity and leads to an increase in the frame responses but with slower attenuation in time.
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Acknowledgments
This research is partially funded under the European Union FP7 Marie Curie Industry-Academia Partnerships and Pathways project NOTES (grant No. PIAP-GA- 2008-230663). The authors are grateful for the support. The authors also thank the anonymous reviewers who have given valuable comments.
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Published In
Journal of Engineering Mechanics
Volume 140 • Issue 8 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 4, 2012
Accepted: Sep 11, 2013
Published online: Sep 13, 2013
Discussion open until: Jul 11, 2014
Published in print: Aug 1, 2014
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