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
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.
Copyright © 2009 by Seismological Society of America