Concepción, Enero del 2008 Felipe Villalobos Universidad ...
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FOUNDATIONS FOR OFFSHORE WIND TURBINES Concepción, Enero del 2008 Felipe Villalobos Universidad Católica de la Santísima Concepción http://www.kentishflats.co.uk
Transcript of Concepción, Enero del 2008 Felipe Villalobos Universidad ...
FOUNDATIONS FOR OFFSHORE WIND TURBINES
Concepción, Enero del 2008Felipe Villalobos
Universidad Católica de la Santísima Concepción
http://www.kentishflats.co.uk
Offshore wind energy in Europe
Arklow Bank
Blyth
North Hoyle
Barrow
Scroby Sands
Kentish Flats
Frederikshavn
Horns RevSamsø
Ems-EmdenIrene Vorrink
Lely
Nysted
MiddelgrundenYttre Stengrund
Utgrunden
http://www.offshorewindenergy.org
The foundation problem
http://www.kentishflats.co.uk
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Environmental Forces:
Waves + Wind + Currents
Gravity
Gravity base and pile foundations
Gravity base foundation being floated out to TunoeKnob Photograph © 1996 by Flemming Hagensen
Limited by sea depth (< 10 m) and turbine size (< 3 MW)
Monopile foundation at Kentish FlatsGravity base foundations at Nysted
For larger turbines (> 4 MW) foundation sizes and time increase considerably
Ems Emden 4.5 MW turbine
Suction caissons
ROV pump(remote operated vehicles)
valve
3 m diameter suction caisson
12 m diameter suction caisson
Research programme
Theoretical analyses
Laboratory model tests
Field trials
100 m
30 m
4 MN
90 m6 MN
Trials and monitoring offshore
Experimental procedures
Installation results
0
20
40
60
80
100
120
140
0 500 1000 1500 2000Vertical loads, V' and V' + S (N)
Ski
rt pe
netra
tion,
h (m
m)
V' = 60 N
V'V' + S
by suction
by pushing
-The use of suction reduces the net vertical load required to install a caisson
-This is possible due to the hydraulic gradients created by the application of suction
Yield surface fromload-displacement response
Vo V
M/2R or H
Vt
M/2R or H
V2V1 V3
V3
Yield point
2R or u
V1
V2
w
V1V2
V3
L
y3y2y1
Final Comments- The foundation design is governed by the harsher
and cyclic nature of loading conditions offshore- Suction caisson foundations might become an
option, in particular for large wind turbines - Beneficial effect in the monotonic and cyclic
response of the caisson when the vertical load increases
- Results to be used in the construction of a hyperplasticity model
http://www.civil.ucsc.cl [email protected]
