Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Effective stress analysis is conducted for six buildings that suffered various patterns of damage during soil liquefaction in the 1995 Hyogoken-Nambu earthquake, in order to examine major causes of the damage as well as the effectiveness of the analytical procedure. A comparison of the computed result with the filed observation indicates that the effective stress analysis is capable of discriminating damaged from undamaged foundations as well as of estimating the damage portion and severity with a reasonable degree of reliability. The analytical result also shows that: (1) the damage to pile heads is mainly due to the inertia force from the superstructure and the damage at depths below the pile head is mainly due to the kinematic force resulting from ground displacements; (2) because of their ductile behavior, steel reinforced concrete piles are immune from extensive damage; and (3) to enclose a pile foundation with diaphragm walls can reduce pile damage but can increase the response of the superstructure as well as the shear force and moment particularly in the lower levels of buildings.

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

Effective Stress Analysis of Pile Foundations Showing Various Damage Patterns in Liquefied Deposits During 1995 Hyogoken-Nambu Earthquake

San Diego, California

Effective stress analysis is conducted for six buildings that suffered various patterns of damage during soil liquefaction in the 1995 Hyogoken-Nambu earthquake, in order to examine major causes of the damage as well as the effectiveness of the analytical procedure. A comparison of the computed result with the filed observation indicates that the effective stress analysis is capable of discriminating damaged from undamaged foundations as well as of estimating the damage portion and severity with a reasonable degree of reliability. The analytical result also shows that: (1) the damage to pile heads is mainly due to the inertia force from the superstructure and the damage at depths below the pile head is mainly due to the kinematic force resulting from ground displacements; (2) because of their ductile behavior, steel reinforced concrete piles are immune from extensive damage; and (3) to enclose a pile foundation with diaphragm walls can reduce pile damage but can increase the response of the superstructure as well as the shear force and moment particularly in the lower levels of buildings.