Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

To explain the heavily damaged area for Kobe earthquake in 1995, nonlinear response characteristics of 2D irregularly reclaimed soil layers of saturated and unsaturated soil are investigated by using the existing FE program for effective stress analysis. For numerical computations, a typical Kobe ground model and a reference ground model with the absorbing boundary conditions are used. In order to understand the local transient characteristics of grounds due to liquefaction, the time-dependent fundamental natural period are investigated as a key parameter. Main conclusions are that liquefaction changes the dynamic characteristics of the sites into the transient high-cut filters and also slightly affects the dynamics of adjacent sites. Combination of irregular layering and rapid change of the dynamic characteristics of grounds due to liquefaction induces dominant shock of acceleration and shear strain at the specific sites, that is, at the central area of the alluvial layer and at the coastal area of the reclaimed layer, respectively.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Local site Effects of Transient Dynamic Characteristics of Irregularly Layered Grounds

San Diego, California

To explain the heavily damaged area for Kobe earthquake in 1995, nonlinear response characteristics of 2D irregularly reclaimed soil layers of saturated and unsaturated soil are investigated by using the existing FE program for effective stress analysis. For numerical computations, a typical Kobe ground model and a reference ground model with the absorbing boundary conditions are used. In order to understand the local transient characteristics of grounds due to liquefaction, the time-dependent fundamental natural period are investigated as a key parameter. Main conclusions are that liquefaction changes the dynamic characteristics of the sites into the transient high-cut filters and also slightly affects the dynamics of adjacent sites. Combination of irregular layering and rapid change of the dynamic characteristics of grounds due to liquefaction induces dominant shock of acceleration and shear strain at the specific sites, that is, at the central area of the alluvial layer and at the coastal area of the reclaimed layer, respectively.