concrete gravity based structure - memorial …sbruneau/teaching/8700project/archive/...concrete...
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Concrete Gravity Based Structure Coastal Labrador Natural Gas Extraction
Midterm Report
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PROJECT SCOPE
Develop a Design Basis Memorandum, preliminary conceptual design, and cost estimate for an offshore Gravity Based
Structure (GBS) for the extraction of Natural Gas from the Coast of Labrador
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PRINCIPLE OBJECTIVES
• Design Basis Memorandum• Geotechnical Parameters• Environmental Design Criteria
• GBS Design Options• Advantages/Disadvantages• Preliminary Quantities
• Preferred Option Report• Quantities/Cost Estimates
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AREA OF OPERATION
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PROBABLE GBS SITES
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GBS SITE CHOSEN
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WHAT THEY THINK IS THERE
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GEOTECHNICAL North Bjarni Site Conditions
2.2 Trillion Cubic Feet of natural gasLocated 100km off the Labrador coast at a water depth of 150m10-40m layer of sediment on the ocean floor
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GEOTECHNICAL Design Considerations
Large design loads necessitate large foundations
Lateral load is a substantial fraction of the vertical load, therefore the overturning moment is very large
There is a major cyclic component of loads
Large settlement due to soft seabed deposits near sea floor
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GEOTECHNICAL Foundation Failure
Modes of Foundation Failure
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ENVIRONMENTAL DESIGN CRITERIA
• WAVE LOAD DATA
100 yr Wave Height 30mAssociated Wave Period 16-19 secsWave is classified as an intermediate wave
(Linear Wave Theory)
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ENVIRONMENTAL DESIGN CRITERIA
• WIND SPEEDS (100 yr Return)1-Hour Mean Wind Speed 44m/s3-second gust 61m/s
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• PACK ICE DATA Measured Depths of up to 8mMulti-year floesFlexural Strength measures up to 0.7MPaLocal Strength Parameters 10.0MPaGlobal Strength Parameters 2.4MPaCrushing Failure
ENVIRONMENTAL DESIGN CRITERIA
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• DESIGN ICEBERGPetro-Canada Bjarni/North Bjarni “Production Perspectives Study” (1983)20,000,000 Metric TonnesTabular Shape, 55m deep, 636m wide~2700MN Force on Impact with structure
• Hibernia – 1300MN
~335GN·m Overturning Moment• Hibernia - 84GN·m
ENVIRONMENTAL DESIGN CRITERIA
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GBS DESIGNSMULTIPLE LEGGED STRUCTURES
Ability to withstand moderate ice conditions
Inability to withstand the load of an iceberg
Slender legged shapes provide little to no storage
Predominant in North Sea
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GBS DESIGNSMULTIPLE LEGGED STRUCTURES
TROLL A
Location: North Sea
Structure Height: 472 mOcean Depth: 303 mStructure Weight: 656,000 Te
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GBS DESIGNSSTEPPED CASSION STRUCTURES
Good stability against overturningGeometry causes failure of ice features and energy dissipation at controlled rate Concurrent construction of major parts possibleConstructability issues due to geometry
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GBS DESIGNSSTEPPED CASSION STRUCTURES
STEPPED STRUCTUREConceptual Design
Location: Beaufort Sea, Labrador Sea
Ocean Depth: 50-200 m
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GBS DESIGNSCONICAL STRUCTURES
Wide base provides stabilityOffers reduced area at water surfaceInclined edge reduces ice loadsCurved walls allows distribution of environmental loads
Geometry reduces maximum storage
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GBS DESIGNSCONICAL STRUCTURES
GRAND BANKS GBSConceptual Design
Location: Atlantic Ocean
Ocean Depth: 80 to 120 m
Silo shaped cylinders provide flotation and ballast
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GBS DESIGNSCYLINDRICAL STRUCTURES
Provide greater stability during construction and tow outAttract higher wave and iceberg loads Greater mass resists larger ice featuresLarge flat roof causes design and constructability issues
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GBS DESIGNSCYLINDRICAL STRUCTURES
HIBERNIA
Structure Height: 224m
Ocean Depth: 111 m
Structure Weight: ≈ 1.1 million Te
Unique wedge shaped outer wall
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FINAL REPORTOutline
• GBS Design Possibilities• Design Basis Memorandum
• Methodology• Conclusions
• Conceptual Design Options (Site Specific)• Advantages/Disadvantages
• Preferred Option Report• Quantities/Cost Estimates
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PROJECT SCHEDULEOutstanding Items
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Thank You!
Questions/Comments
End of Show
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CELEBRITIES IN ENGINEERING
An Updated Version
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STAY TUNED!
Control the pet population, have your pet spayed or neutered!