Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

In general, seismic provisions worldwide present different criteria for site classification, based on specific soil and rock properties, in order to determine representative design spectra for seismic design. On the other hand, results of site–specific analysis and seismic microzonation studies have shown not only the main properties of soil-rock profile that have marked influence on site response, but also site characteristics where it is necessary to carry out detailed and particular studies of earthquake ground response. This paper analyzes and compares site classification for seismic design of some seismic codes worldwide, with results of site-specific analysis and seismic microzonation studies. These comparative analyses were carried out for different kind of soil profiles such as fine-grained alluvial deposits, hard and coarse alluvial deposits, lake deposits, colluvial deposits, deposits of volcanic ashes, residual soils of igneous, metamorphic and sedimentary rocks, among others. Results of these analyses show that site classifications of seismic provisions are not always representative of earthquake site response. Results and conclusions of this paper emphasize the importance of site-specific analysis for some soil-rock conditions, as well as illustrate the influence of some variables such as thickness of the soil profile until reaching bedrock, relationships of shear modulus reduction with cyclic shear strain, and bedrock stiffness on earthquake site response. Based on these results, this paper propose a methodology for site-specific analysis and seismic microzonation studies.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Analysis of Earthquake Site Response and Site Classification for Seismic Design Practices

San Diego, California

In general, seismic provisions worldwide present different criteria for site classification, based on specific soil and rock properties, in order to determine representative design spectra for seismic design. On the other hand, results of site–specific analysis and seismic microzonation studies have shown not only the main properties of soil-rock profile that have marked influence on site response, but also site characteristics where it is necessary to carry out detailed and particular studies of earthquake ground response. This paper analyzes and compares site classification for seismic design of some seismic codes worldwide, with results of site-specific analysis and seismic microzonation studies. These comparative analyses were carried out for different kind of soil profiles such as fine-grained alluvial deposits, hard and coarse alluvial deposits, lake deposits, colluvial deposits, deposits of volcanic ashes, residual soils of igneous, metamorphic and sedimentary rocks, among others. Results of these analyses show that site classifications of seismic provisions are not always representative of earthquake site response. Results and conclusions of this paper emphasize the importance of site-specific analysis for some soil-rock conditions, as well as illustrate the influence of some variables such as thickness of the soil profile until reaching bedrock, relationships of shear modulus reduction with cyclic shear strain, and bedrock stiffness on earthquake site response. Based on these results, this paper propose a methodology for site-specific analysis and seismic microzonation studies.