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Evaluation and implementation of an improved methodology for earthquake ground response analysis : uniform treatment source, path and site effects.
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2008-12-01
[PDF-18.54 MB]
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Alternative Title:Evaluation and implementation of an improved methodology for earthquake ground response analysis : uniform treatment of uncertainties in source, path, and site effect.
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Abstract:Shortly after the 1994 Northridge Earthquake, Caltrans geotechnical engineers charged with developing site-specific
response spectra for high priority California bridges initiated a research project aimed at broadening their perspective
from simple geotechnical site response analyses to a more comprehensive seismological approach. The project was
centered on a series of seminars on seismological theory and analyses using a pair of stochastic numerical ground
motion models that allowed uniform treatment of uncertainties in recognized earthquake source, path, and site effects.
The project was not intended to produce a “report” per se, but rather, was meant to strengthen the knowledge and
perspective of practicing engineers. Nevertheless, hard copy of seminar notes and a portion of the analyses have now
been recovered, scanned and compiled into this volume for their archival and educational value.
Seven sets of seminar notes and two application examples are presented. Two seminars provide an overview of sitespecific
specification of ground motion from a seismological perspective. Another seminar provides background on
seismological instrumentation and processing of strong-motion recordings. A pair of seminars addresses empirical
attenuation models and outlines the variety of numerical ground motion modeling approaches. The final pair of seminars
systematically explore source, path and site effects on ground motion and various strategies employed to capture these
effects for purposes of prediction. The two application examples use the stochastic model to explore the impacts and
uncertainties of geotechnical site effects within the context of the broader seismological problem.
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