Probabilistic Seismic Hazard Analysis for Maximum Seismic Shear Stresses in Soils Using Improved Ground-Motion Parameters
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 2
Abstract
Maximum seismic shear stresses () have been recognized as one of the important parameters in design practice. This study develops ground-motion parameters for and implements these in probabilistic seismic hazard analysis to provide the distribution of deep soil layers for design purposes. The application of improved ground-motion parameters for is demonstrated at the Oakland International Airport, where a thick Young Bay Mud deposit exists under the artificial fill. Model biases in the predictive equations of seismic shear-stress reduction coefficients () are evaluated by comparison with the site response analyses performed with a wide range of input ground motions. Based on these results, we introduce improved ground-motion parameters for as a linear combination of spectral accelerations, implemented in probabilistic seismic hazard analysis to calculate seismic hazard curves. Conditional mean spectra are calculated, given at 10% in 50 years to illustrate the variations in frequency contents with depth compared with the uniform hazard spectra. Finally, is calculated with depth by using hazard values of and compared with the peak-ground-acceleration-based and uniform-hazard-spectra-based calculations. Analysis results show that will be underestimated for deep soil layers by peak-ground-acceleration-based calculation if the median value of is used in design practice.
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Acknowledgments
This study is partly supported by the Japan Science Technology and Japan International Corporation Agency. The authors acknowledge Ivan Wang at URS Corporation, Oakland for the fault systems in California. We also acknowledge Professor Yamazaki at Chiba University, Japan in providing the research environment of this study. The framework of this paper was primarily developed during the Ph.D. study at University of California, Davis in discussions with Professors Boulanger and Abrahamson. We acknowledge both professors for the valuable comments and precious inputs. Finally, we appreciate three anonymous reviewers for important critiques to improve the quality of the paper.
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© 2013 American Society of Civil Engineers.
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Received: Jul 18, 2011
Accepted: Mar 29, 2012
Published online: Mar 31, 2012
Published in print: Feb 1, 2013
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