Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

In this paper the case is made for an integrated approach to the earthquake resistant design of structure-foundation systems. Emphasis is placed on the need to analyse the response of a system that has the foundation and structure modelled with comparable levels of sophistication. The paper gives examples which illustrate what can be achieved with simplified models that represent the essence of the structural and foundation behaviour. However, to achieve a truly integrated structure-foundation design the investigation of the soil in which the foundation will be constructed needs to receive effort comparable to that expended in modelling the structurefoundation system. This requires accurate mapping of the soil types and layers present as well as estimation of the shear strength and stiffness of these materials. For the cyclic loading that occurs during an earthquake the shear stains in the soil near the foundation will be larger than those associated with shear wave propagation, so an “operational” stiffness is needed for the soil. Field test data for shallow and deep foundations at a site in Auckland residual soil are presented to show the extent of soil softening during foundation cyclic loading.

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

Integrated Earthquake Resistant Design of Structure-Foundation Systems

San Diego, California

In this paper the case is made for an integrated approach to the earthquake resistant design of structure-foundation systems. Emphasis is placed on the need to analyse the response of a system that has the foundation and structure modelled with comparable levels of sophistication. The paper gives examples which illustrate what can be achieved with simplified models that represent the essence of the structural and foundation behaviour. However, to achieve a truly integrated structure-foundation design the investigation of the soil in which the foundation will be constructed needs to receive effort comparable to that expended in modelling the structurefoundation system. This requires accurate mapping of the soil types and layers present as well as estimation of the shear strength and stiffness of these materials. For the cyclic loading that occurs during an earthquake the shear stains in the soil near the foundation will be larger than those associated with shear wave propagation, so an “operational” stiffness is needed for the soil. Field test data for shallow and deep foundations at a site in Auckland residual soil are presented to show the extent of soil softening during foundation cyclic loading.