Centrifuge modelling of monopiles for offshore wind turbines...DTU Civil Engineering, Technical...
Transcript of Centrifuge modelling of monopiles for offshore wind turbines...DTU Civil Engineering, Technical...
Centrifuge modelling of monopiles for offshore wind turbines
DTU Civil Engineering, Technical University of Denmark
Monopile
06/10/2011Ph.D projekt af Rasmus T. Klinkvort 2009-20122
(http://www.ramboll-wind.com/, 2010)(http://www.dongenergy.com ,2010) (Byrne & Houlsby, 2006)
DTU Civil Engineering, Technical University of Denmark
Research method
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20123
Prototype model
Numerical model
Scaled model
Constitutive law
Scaling law
Calibration&
Verification
DTU Civil Engineering, Technical University of Denmark
Research method
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20124
Prototype model
Numerical model
Scaled model
Constitutive law
Scaling law
Calibration&
Verification
DTU Civil Engineering, Technical University of Denmark
Dimensional analysis of a laterally loaded pile in sand
• For a laterally loaded pile
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20125
( )
=
==
',,,,'
),,,,,,,(',',,,,,,
503
87654321
50
ϕγ
ππππππππϕγ
dd
dL
de
duf
dH
fFdLeduHfF
DTU Civil Engineering, Technical University of Denmark
Centrifuge modelling
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20126
DTU Civil Engineering, Technical University of Denmark
Centrifuge modelling
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20127
Scale effect – Modelling of models
DTU Civil Engineering, Technical University of Denmark
Scale effect
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20128
DTU Civil Engineering, Technical University of Denmark
Installation effect
06/10/2011Ph.D project by Rasmus Klinkvort 2009-20129
DTU Civil Engineering, Technical University of Denmark
Non-Linear stress distribution
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201210
DTU Civil Engineering, Technical University of Denmark
The non-linear stress distribution effect
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201211
DTU Civil Engineering, Technical University of Denmark
Centrifuge modelling
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201212
Stress level effect
DTU Civil Engineering, Technical University of Denmark
Stress level effect
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201213
DTU Civil Engineering, Technical University of Denmark
Stress level effect
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201214
DTU Civil Engineering, Technical University of Denmark
Modelling technique
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201215
Prototype model
Numerical model
Scaled model
Constitutive model
Scaling laws
Calibration&
Verification
DTU Civil Engineering, Technical University of Denmark
Monotonic tests e=15d, L=6d & d=1-?m
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201216
DTU Civil Engineering, Technical University of Denmark
Monotonic tests e=8.25d, L=6d & d=1-?m
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201217
DTU Civil Engineering, Technical University of Denmark 06/10/2011Ph.D project by Rasmus Klinkvort 2009-201218
DTU Civil Engineering, Technical University of Denmark
Cyclic loading of monopile
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201219
DTU Civil Engineering, Technical University of Denmark
Cyclic loading of monopile ζb=0.35, ζc=-0.5
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201220
DTU Civil Engineering, Technical University of Denmark
Accumulation of deflection – 10 000 cycles
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201221
1000 cycles capture the trend
Fatique limit state 107
cycles
DTU Civil Engineering, Technical University of Denmark
Cyclic p-y curves, e=15d, L=6d & d=1-?m
06/10/2011Ph.D project by Rasmus Klinkvort 2009-201222
06/10/201123 Ph.D project by Rasmus T. Klinkvort 2009-2012
ConclusionsCentrifuge modelling of monopiles: Stress distribution Load eccentricity/Pentration depth... Development of initial subgrade reaction÷ Diameter effect÷ (Size of Stiffness)
Cyclic tests: Accumulation of deflection/rotations Increase in stiffness Damping in the soil÷ Accumulation of porepresure