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Abstract: Current
design methodology for cyclically, laterally loaded monopile foundations uses the p-y
method to calculate deflections. The p-y method, which is based on a few full-scale
tests of long, slender piles subjected to fewer than 200 cycles of loading, is not
applicable to wind turbine foundations because they are subjected to as many as 107
cycles of loading and are not long, ... read moreslender structures. This research presents a method
to model monopiles using soil parameters that include the effects of long-term cyclic
lateral loading. Modulus degradation curves are implemented to describe the reduction in
soil stiffness as a function of the number of loading cycles. These curves can then be
utilized with the finite element method to model the long-term behavior of a monopile in
sand. The results include mesh refinement studies and the modeled response of a monopile
for multiple cycles of loading, including the effects of modulus
degradation.
Thesis (M.S.)--Tufts University,
2012.
Submitted to the Dept. of Civil
Engineering.
Advisor: Lewis
Edgers.
Committee: Aaron Bradshaw, and David
Shields.
Keywords: Civil engineering, and Geological
engineering.read less
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