Cyclic P-Y Curves for a Pile in Cohesive Soil
Publication: Geotechnical Earthquake Engineering and Soil Dynamics IV
Abstract
A lateral load test was performed on a full-scale steel pipe pile installed in a soil profile consisting of cohesive, fine-grained soils with occasional sand layers. The pile was loaded in nine increments from 0 to 89 mm of displacement, with 15 loading cycles applied for each increment. P-y curves representing static monotonic and cyclic loading conditions were derived from strain gauge data using a moving cubic polynomial technique. The results of push-over analyses using the derived p-y curves as input agreed well with the measured load-displacement response. It was observed that the cyclic p-y curves exhibited a sharp concave-up shape which contrasted with the broader concave-down shape of the static p-y curves. The cyclic p-y curves also exhibited lower peak resistances relative to the static p-y curves. The initial portion of the cyclic p-y curves is relatively flat with near-zero resistance which represents gapping of the soil. The displacement at which the soil reaction component of the cyclic p-y curves begins to dramatically increase is a function of the maximum displacement during previous loading cycles. It was also observed that the effects of cyclic loading were more pronounced in shallower soils.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Jun 20, 2012
ASCE Technical Topics:
- Continuum mechanics
- Curvature
- Cyclic loads
- Displacement (mechanics)
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Foundations
- Geometry
- Geotechnical engineering
- Lateral loads
- Load tests
- Mathematics
- Pile foundations
- Pile tests
- Piles
- Pipe piles
- Solid mechanics
- Steel piles
- Structural dynamics
- Structural mechanics
- Tests (by type)
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