Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; April 2006; v. 96; no. 2; p. 506-518; DOI: 10.1785/0120050062
© 2006 Seismological Society of America
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Smooth Spectra of Horizontal and Vertical Ground Motions

Praveen K. Malhotra1

1 FM Global
1151 Boston-Providence Turnpike
Norwood, Massachusetts 02062-9102
Praveen.Malhotra{at}FMGlobal.com

An improved method of constructing a smooth-response spectrum from peak values of ground acceleration, velocity, and displacement (PGA, PGV, and PGD) is presented. Improved dynamic amplification factors are presented for applying damping adjustments to the spectral accelerations or to backcalculate PGA, PGV, and PGD from spectral accelerations. Horizontal-to-vertical spectral ratios are analyzed for rock and soil sites to allow the construction of a vertical design spectrum from a given horizontal design spectrum.






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