Deep Sea Offshore Wind R&D Conference 2021 Early age ...
Transcript of Deep Sea Offshore Wind R&D Conference 2021 Early age ...
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© ForWind1
Prof. Peter Schaumann Joshua Henneberg, M.Sc.LUH, Institute for Steel Construction 14th January 2021, Trondheim
Deep Sea Offshore Wind R&D Conference 2021
Early age movement in offshore structures with various bearing conditions
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Outline
© DOTI/alpha ventus
Motivation Early age movement Joint research project
Seastate simulations and boundaries Monoplies Jacket structures OWT Jacket structures OSS
Summary and outlook
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Motivation
© eon
Movements in the material during curing
Movements due to variable loading conditions
Strength development duringcuring
E.g. sedimentation and segregation
Bond defects
What is early age movement (EAM)?
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Sleeve
PileFluid grout material
Grouting procedure
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Joined research project GREAM
© eon
Material
Local simulations
Global simulations
Experiments
Institute of Material Science
Institute for Steel Construction
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Joined research project GREAM
© eon
© eon
Material
Local simulations
Global simulations
Institute of Material Science
Experiments
Institute for Steel Construction
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Motivation
© DOTI/alpha ventus
© eon
© eon
2016
No strict limits
Axial relative movement <1mm
Axial Relative movement <1mm
2014
DNV / DNVGL
< 1mm
Strict limit due to small amount of tests (primarily 35 years ago)
Influence of horizontal movement not investigated
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Offshore structures with grouted connections
© DOTI/alpha ventus
© eon
© eon
Offshore wind turbines Converter platforms
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Offshore structures with grouted connections
© DOTI/alpha ventus
© eon
© eon
Offshore wind turbines Converter platforms
8
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Offshore structures with grouted connections
© DOTI/alpha ventus
© eon
© eon
Offshore wind turbines Converter platforms
9
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Offshore structures with grouted connections
• Positioning and leveling (using brackets “ hydraulic jackups”)
Installation procedure
Brackets
Installation weather window:
Hs = 0.5 - 3mT = 5.6 – 8.47s
© KCI
10
© Jumbo
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Ring flange(300mm x 175mm)
Top view
L TP
Side view
MSL
B = Brackett = wall thicknessD = diameterLTP = transition piece lengthLG = grout length
B1t
120°
B2D
Lg
B3B1B2B3
B3
B4
B160°
B2
B5
B6
B4B5 B6
Early age movement in monopile structures
© DOTI/alpha ventus
© eon
Geometry
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Ring flange(300mm x 175mm)
Top view
B1B2
B3
L TP
Side view
MSL
B = Brackett = wall thicknessD = diameterLTP = transition piece lengthLG = grout length
B1t
120°
B2D
Lg
B3
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement in monopile structures
© DOTI/alpha ventus
© eon
ANSYS AQWA + ANSYS Mechanical
(1)(1) (2)
Δuradial
12
uradial [mm]
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement in monopile structures
© DOTI/alpha ventus
Brackets
(2)(1) (2)
Δuradial
13
ANSYS AQWA + ANSYS Mechanical
uradial [mm]
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement in monopile structures
© eon
© eon
𝜂𝜂 =𝑀𝑀𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑀𝑀𝑆𝑆𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷
≤ 1.0 𝜂𝜂 =𝐹𝐹𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐹𝐹𝑆𝑆𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷
≤ 1.0
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Short grout length and TP length
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Offshore structures with grouted connections
© DOTI/alpha ventus
© eon
© eon
Offshore wind turbines Converter platforms
15
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Offshore structures with grouted connections
© DOTI/alpha ventus
© eon
© eon
Offshore wind turbines Converter platforms
16
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement at jacket structures of OWT
© DOTI/alpha ventus
© eon
• Positioning and leveling (using brackets “ hydraulic jackups”)
Installation procedure
© IHC IQIP
• Embracing (pile gripper, horizontal brackets, wedges and grout plugs)
Stopper
Pile gripper© Boskalis
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement at jacket structures of OWT
Simulation ANSYS WB
Stoper
Grout seal
Foundation pile
Mud line
MSL
EAM
System and boundaries
22m
42m
60m
Mud lineFoundation pile
Stopper
0° 45°
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EAM
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement at jacket structures of OWT
© DOTI/alpha ventus
© eon
Wave
Δurel = 1.07mm
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement at jacket structures of OWT
© eon
Wave
Δurel = 0.82mm
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Early age movement at jacket structures of OWT
© eon
Stiffness of bottom node important and thickness variation more effective than diameter variation
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Summary
Magnitude >1mm up to several milimiters (Hs = 3m )
Monopiles: larger transition pieces toppling (-) local deformations (+)
Increase structural stiffness is favourable
Analyses of early age movement according to current guidelines for kind and magnitude in different offshore wind structures
greater wall thickness better than greater diameter
General trend to slender/optimized as well as increasing
structures lead to increasing EAM
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction
Outlook
Further experimental investigations on EAM
What is needed to withstand occurring problems?
Depiction of fluid grout resistance in
on-bottom simulation
Submodelling and spring / damper approach
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Early age movement in offshore structures with various bearing conditionsJoshua HennebergLeibniz University Hannover
Institute for Steel Construction24
Thank you for your interest !Prof. Dr.-Ing. Peter Schaumann [email protected]
Joshua Henneberg, [email protected]
Leibniz University HannoverInstitute for Steel ConstructionAppelstraße 9A30167 Hannover
https://www.stahlbau.uni-hannover.de/en/