Pile Cap Interaction with Bridge Pile Foundations under Lateral Loads
Publication: Journal of Bridge Engineering
Volume 24, Issue 6
Abstract
The paper presents an analytical pile–cap soil model to determine the lateral resistance of a pile cap in sandy soils and its contribution to the lateral resistance of the bridge pile group–cap foundation system of pinned or fixed pile head connections with the pile cap. The strain wedge (SW) model approach was adopted to incorporate the pile cap in an interactive pile group–cap foundation system. The proposed model allows the calculation of the mobilized passive and side shear cap–soil resistance based on soil, cap, and pile properties. The study demonstrated the contribution of the pile cap in sandy soils to the total pile group–cap bridge foundation system (i.e., the bridge foundation lateral stiffness), which could approach 50% of the total pile group–cap lateral resistance. Such relative contribution varied with lateral deflection and the soil around the cap and pile group as well as the rotational restraint of the pile head–cap connection. The proposed technique was validated through comparisons with full-scale load tests.
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Acknowledgments
We thank Dr. Gary Norris for his review of and constructive comments in preparation of the final manuscript. He also revised the relationship for λ as a function of SL in Fig. 6.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 24 • Issue 6 • June 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: May 6, 2018
Accepted: Dec 12, 2018
Published online: Apr 12, 2019
Published in print: Jun 1, 2019
Discussion open until: Sep 12, 2019
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