Concepción, Enero del 2008 Felipe Villalobos Universidad ...
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]