Abstract
Batter pile (or inclined pile) foundations are widely used in civil engineering structures. However, their behavior under dynamic loadings is not yet thoroughly understood. This paper presents an experimental work on the behavior of batter and vertical piles considering dynamic soil-pile-superstructure interactions. A series of dynamic centrifuge tests were performed using sinusoidal excitations. The influence of the base shaking (frequency content and amplitude) and of the height of the center of gravity of the superstructure is investigated. Seismic responses are analyzed considering the pile cap displacements and forces (total base shear, overturning and residual moments, axial forces). It is found that in certain cases batter piles play a beneficial role on the dynamic behavior of the pile foundation system. This novel experimental work provides an important database on the behavior of batter pile foundations under dynamic loadings.
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Notes
The thin aluminum plate is used to maintain precisely the inclination angle of 15°.
The steel rods and plastic wire are used to minimize the impact of sand during pluviation. During the pluviation, when the sand surface is about 5 cm higher than the tips of the piles, the wires are cut to free the pile tips. After the sand surface arrives at the prescribed height, the pluviation stops and the steel rods are removed.
Shadowing effect: during sand pluviation the presence of items can influence the falling of sand into the container and thus affect the homogeneity of the sand deposit.
Comparison with the maximum accelerations and displacements measured from free field tests showed that these accelerometers measurements are representative of free field conditions and are not influenced by the pile group.
Abbreviations
- DSPSI:
-
Dynamic soil-pile-superstructure interaction
- C.G.:
-
Center of gravity of the superstructure
- IS:
-
Inclined (batter) pile group with short superstructure
- VS:
-
Vertical pile group with short superstructure
- ITT:
-
Inclined (batter) pile group with tall superstructure
- VTT:
-
Vertical pile group with tall superstructure
- P7:
-
One pile in the 1 × 2 pile group, on the ‘Porte’ side
- P8:
-
One pile in the 1 × 2 pile group, on the ‘Pivot’ side
- BS:
-
Base shear
- OM:
-
Overturning moment acted on the foundation
- RBM:
-
Residual bending moment
- RBMmax :
-
Maximum residual bending moment
- RBMP7 :
-
Residual bending moment of P7
- RBMP7max,VS :
-
Maximum residual bending moment of P7 in vertical pile group with short superstructure
- M:
-
Total bending moment
- MP7 :
-
Total bending moment of P7
- MP7max,VS :
-
Maximum total bending moment of P7 in vertical pile group with short superstructure
- N:
-
Axial force
- NP7 :
-
Axial force in pile P7
- NP7max,VS :
-
Maximum axial force in pile P7 in vertical pile group with short superstructure
- z:
-
Depth of the pile
- D:
-
External diameter of the pile
- Dpile :
-
Center-to-center distance between piles
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Acknowledgments
The financial support of IFSTTAR (Institut français des sciences et technologies des transports, de l’aménagement et des réseaux) and of the Région Pays de la Loire is gratefully acknowledged. The authors would like also to thank the valuable support and help from the technical staff of the IFSTTAR centrifuge team.
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Li, Z., Escoffier, S. & Kotronis, P. Centrifuge modeling of batter pile foundations under sinusoidal dynamic excitation. Bull Earthquake Eng 14, 673–697 (2016). https://doi.org/10.1007/s10518-015-9859-2
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DOI: https://doi.org/10.1007/s10518-015-9859-2