Synthetic Pulse Model for Near-Fault Effects on Structures
Publication: Practice Periodical on Structural Design and Construction
Volume 25, Issue 3
Abstract
The inclusion of near-fault effects is now required for building structures designed in accordance with ASCE 7-16 using nonlinear time history analysis. It is also a recognized problem for bridge structures, particularly those with long natural periods. Although existing ground motion databases contain thousands of records, this article shows that just a small percentage contain near-fault pulse-like ground motions. Hence a model for generating synthetic pulses to supplement the available near-fault ground motion data set is necessary and examined in this article. A family of analytic wavelets, known as generalized Morse wavelets, is considered for this purpose. This wavelet family is capable of modeling pulse-like ground motions, using the continuous wavelet transform, by varying two parameters that control wavelet shape and number of oscillations. Using a suite of ground motions that satisfy ASCE 7-16’s near-fault criteria, a model for generating synthetic pulses is created. A series of regression equations for the synthetic pulse model are presented to show the relationship between pulse parameters, peak ground acceleration, and moment magnitude.
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Data Availability Statement
The ground motions used in this study may be obtained from the PEER NGA West 2 Database located at https://ngawest2.berkeley.edu/. Record numbers for each ground motion are clearly identified in Table 1. Resources for GMW and CWT may be obtained from jLab, a freely available MATLAB toolbox found at http://www.jmlilly.net/jmlsoft.html.
Acknowledgments
The author would like to thank the two reviewers who provided valuable suggestions for improving this manuscript.
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Published In
Practice Periodical on Structural Design and Construction
Volume 25 • Issue 3 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 19, 2019
Accepted: Jan 10, 2020
Published online: Apr 21, 2020
Published in print: Aug 1, 2020
Discussion open until: Sep 21, 2020
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