Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

This paper studies the topographic aggravation of the peak seismic acceleration in the horizontal and vertical directions for various cases of 2D uniform surface geometries: hills, canyons and slopes. The study is based on a large number of 2D wave propagation analyses for uniform soil conditions performed with the finite-difference method. All analyses were visco-elastic, assumed vertically impinging harmonic SV waves and studied parametrically the effects of the slope inclination i, the dimensionless height H/λ of the topographic feature (where H is the height and λ is the predominant S wavelength) and of the width B of the canyon base and the hill top. The analyses show that the crests of canyons suffer from increased parasitic vertical accelerations as compared to the respective slopes (with the same ι and H/λ), while the aggravation of the horizontal acceleration is similar. For the cases of hills, the analyses show that the width B of the hill top is a crucial parameter, since small values of B lead to very large aggravations of the peak horizontal acceleration at the hill crest, as compared to the respective slopes.

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

Aggravation of the Peak Seismic Acceleration in the Vicinity of 2D Hills, Canyons and Slopes

San Diego, California

This paper studies the topographic aggravation of the peak seismic acceleration in the horizontal and vertical directions for various cases of 2D uniform surface geometries: hills, canyons and slopes. The study is based on a large number of 2D wave propagation analyses for uniform soil conditions performed with the finite-difference method. All analyses were visco-elastic, assumed vertically impinging harmonic SV waves and studied parametrically the effects of the slope inclination i, the dimensionless height H/λ of the topographic feature (where H is the height and λ is the predominant S wavelength) and of the width B of the canyon base and the hill top. The analyses show that the crests of canyons suffer from increased parasitic vertical accelerations as compared to the respective slopes (with the same ι and H/λ), while the aggravation of the horizontal acceleration is similar. For the cases of hills, the analyses show that the width B of the hill top is a crucial parameter, since small values of B lead to very large aggravations of the peak horizontal acceleration at the hill crest, as compared to the respective slopes.