Exciting news! We're transitioning to the Statewide California Earthquake Center. Our new website is under construction, but we'll continue using this website for SCEC business in the meantime. We're also archiving the Southern Center site to preserve its rich history. A new and improved platform is coming soon!

Site Effects in Ground Motion Models for Structural Performance Estimation

Domniki Asimaki, Wei Li, & Michalis Fragiadakis

Published 2010, SCEC Contribution #1344

We study how the selection of site response model affects the ground motion predictions of seismological models, and in turn how the synthetic motions obtained using different soil models affect the structural performance estimation. For this purpose, we compute ground motion synthetics for 6 earthquake scenarios of a strike-slip fault rupture, and estimate the ground surface response for 24 typical soil profiles in Southern California. We use viscoelastic, equivalent linear and nonlinear analyses for the site response simulations, and evaluate the ground surface motion variability that results from the soil model selection. Next, we subject a series of bilinear single degree of freedom oscillators to the ground motions computed using the alternative soil models, and evaluate the consequent variability in the structural response. Results show high bias and uncertainty of the inelastic structural displacement ratio predicted using the linear site response model for periods close to the fundamental period of the soil profile. The amount of bias and the period range where the structural performance uncertainty manifests are shown to be a func-tion of both input motion and site parameters. We finally derive empirical correlations between the site parameters and the variability introduced in structural analyses based on our synthetic ground motion simulations.

Asimaki, D., Li, W., & Fragiadakis, M. (2010). Site Effects in Ground Motion Models for Structural Performance Estimation. In Asimaki, D., Li, W., & Fragiadakis, M. (Eds.), Computational Methods in Earthquake Engineering, (, pp. ) , : Springer