Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

While seismic codes do not allow plastic deformation of piles, the Kobe earthquake has shown that limited structural yielding and cracking of piles may not be always detrimental. This paper focuses on the influence of soil compliance, pile-to-pile interaction, intensity of seismic excitation, pile diameter, above–ground height of the pile, location of plastic hinges (above or below ground development), on the seismic response of pile supported bridge structures. Evaluation of the bridge pier behaviour is achieved through key performance measure indices, as is: the displacement (global) and curvature (local) ductility demands and the maximum drift ratio. It is shown that the ductility demand of a bridge pier decreases with both (a) increasing soil compliance, and (b) below-ground location of plastic hinges development. By exploiting the results, a new performance based design method is developed that allows for soil and pile yielding instead of over-designing the foundation to behave nearly elastically and forcing the potentially developed plastic hinges to occur in the pier (as with conventional capacity design).

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

Seismic Response of Inelastic Pile Foundations: A New Performance Based Design Philosophy

San Diego, California

While seismic codes do not allow plastic deformation of piles, the Kobe earthquake has shown that limited structural yielding and cracking of piles may not be always detrimental. This paper focuses on the influence of soil compliance, pile-to-pile interaction, intensity of seismic excitation, pile diameter, above–ground height of the pile, location of plastic hinges (above or below ground development), on the seismic response of pile supported bridge structures. Evaluation of the bridge pier behaviour is achieved through key performance measure indices, as is: the displacement (global) and curvature (local) ductility demands and the maximum drift ratio. It is shown that the ductility demand of a bridge pier decreases with both (a) increasing soil compliance, and (b) below-ground location of plastic hinges development. By exploiting the results, a new performance based design method is developed that allows for soil and pile yielding instead of over-designing the foundation to behave nearly elastically and forcing the potentially developed plastic hinges to occur in the pier (as with conventional capacity design).