Performance-Based Design of Drilled Shaft Bridge Foundations
Publication: Journal of Bridge Engineering
Volume 16, Issue 6
Abstract
The design of deep foundations for bridge structures should ideally consider the interaction between the soil and the foundation element to properly model the side and tip resistance components. A soil-structure interaction model, such as the model method, can be utilized to develop a load-displacement curve for a deep foundation subjected to axial loads. The load-displacement curve represents the behavior of the deep foundation over a range of applied axial loads. More importantly, however, the load-displacement curve can be analyzed by using performance-based design criteria, such as a tolerable displacement corresponding to the service limit state. The tolerable displacement of an individual deep foundation element can be selected to correspond to a movement that would cause adverse performance, excessive maintenance issues, or functionality problems with the bridge structure. In this paper, a performance-based soil-structure interaction design approach for the strength and service limit state axial design of drilled shafts using the AASHTO-LRFD approach is presented. The approach explicitly incorporates field load test data into the design to increase design efficiency while satisfying the limit states. A design example using drilled shaft load test data acquired via the O-cell technology has also been included to demonstrate the developed methodology for use in day-to-day bridge foundation design.
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© 2011 American Society of Civil Engineers.
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Received: Jul 29, 2010
Accepted: Jan 11, 2011
Published online: Jan 13, 2011
Published in print: Nov 1, 2011
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