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A nonlinear site amplification model for the horizontal component developed for ground-motion prediction equations in Japan using site period as the site-response parameter

Hou Ruibin and John X. Zhao
A nonlinear site amplification model for the horizontal component developed for ground-motion prediction equations in Japan using site period as the site-response parameter
Bulletin of the Seismological Society of America (September 2021) Pre-Issue Publication

Abstract

This article presents a nonlinear site amplification model for ground-motion prediction equations (GMPEs), using site period as site-effect proxy based on the measured shear-wave velocity profiles of selected KiK-net and K-NET sites in Japan. This model was derived using 1D equivalent-linear site-response analysis for a total of 516 measured soil-site shear-wave velocity profiles subjected to a total of 912 components of rock-site records. The modulus reduction and damping curves for each soil layer were assigned based on the soil-type description for a particular layer. The site period and site impedance ratio affect both the linear and nonlinear parts of this study, and were used as the site parameters in the 1D amplification model. A large impedance ratio enhances the amplification ratios when the site responds elastically and enhances the nonlinear response when the site develops a significant nonlinear response. The effects of moment magnitude and source distance on the linear part of the 1D amplification model were also incorporated in the model. To implement the 1D amplification model into GMPEs, a model adjustment is required to match the GMPE amplification ratio at weak motion and to retain the nonlinear amplification ratio at the strong motion of the 1D model. The two-step adjustment method by Zhao, Hu, et al. (2015) was adopted in this study with significant modifications. It is not possible to obtain a credible second-step adjustment parameter using the GMPEs dataset only. We proposed three methods for calculating the scale factors. Method 1 is a constant angle in a 30 degrees -60 degrees range for all spectral periods; method 2 was based on the GMPE dataset and 1-D model parameters; and method 3 was based on the strong-motion records used for the 1D site modeling. A simple second-step adjustment factor leads to smoothing amplification ratios and soil-site spectrum.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: Pre-Issue Publication
Title: A nonlinear site amplification model for the horizontal component developed for ground-motion prediction equations in Japan using site period as the site-response parameter
Affiliation: Southwest Jiaotong University, School of Civil Engineering, Department of Geotechnical Engineering, Chengdu, China
Published: 20210928
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 50
Accession Number: 2021-067369
Categories: SeismologyEngineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
Secondary Affiliation: Shandong Jianzhu University, Key Laboratory of Building Structural Retrofitting and Underground Space Engineering, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
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