floating structure
TRANSCRIPT
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An Introduction To Very Large
Floating Structures
SUBMITTED BY:AMIT KUMAR SINGH
0801211417
8TH SEM
CIVIL ENGINEERING
OEC,BHUBANESWAR
UNDER THE GUIDENCE of:-
MR. K.P DAS
PROF. CIVIL DEPT.
OEC,BHUBAESWAR
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CONTENTS
INTRODUCTION
WHY MEGA FLOAT ?
WHAT DOES MEGA FLOAT CONSISTS OF
FACTORS TO BE CONSIDERED FOR ANALYSIS
DESIGN LOAD
CONSTRUCTION MATHODOLOGY
EFFECT ON MEGA FLOAT
CONCLUSION
REFERENCES
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Introduction
1.Mega-Float is very large artificial structures
floating on the sea
2.Basically two type:-
a. semi-submersible
b. pontoon type(mega float)
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WHY MEGA FLOAT ?
1.Virtually no influence of earthquake.
2.Few environmental impacts on ocean currents
and marine eco-systems .3.Relatively lower construction cost and shorter
construction period independent of water depth
or soil condition of sea bed
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What does Mega Float consists of ?
1.Mega-Float system consists of floating structure,
mooring system and access facility
2.Mooring system such as dolphin and fender is
provided to moor the floating structure.
3.Access facility such as bridge is provided for
connection with existing land
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Architecture of Mega Float
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FACTORS TO BE CONSIDERED
FOR ANALYSIS
1.Horizontal forces
a) Rigid connection
b) Compliant connection
2.Buoyancy forces
3.Inertia force
4.Corrosion rate
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Design Loads
1.Dead load
2.Hydrostatic pressure (including buoyancy)
3.Live load
4.Effects of temperature change
5.Effects of water current
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Step1:
Fabrication At Shipyard
1.Relatively small unit with dimensions of
approximately 300m long and 60m wide is
fabricated in dry docks. Generally it is easier
quality-wise and cost-wise to fabricate it at
shipyard than to do it at installation site,
because more effective equipment and more
skilled workers specialized for such a work areavailable there.
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Step1
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Step2:
Towing to Installation Site
1. As fabricated unit has a similar structure to ship,
it is buoyant and able to be transported on sea.
Each unit necessary to install is transported to
site one by one by tugboats with strong engine.
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Step2
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Step3:
Installation of Mooring Device
1.The work at the site begins with the installation
of Mooring Device. The structure of the device,
which is comprised of a jacket type dolphin,
piles and fenders, is similar to that used
commonly in oil facilities offshore, and the
installation is done likewise.
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Step3:
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Step4:
Mooring of Unit and Joining of Units
1.The first unit transported to the site is moored to
the mooring device. The next unit transported
successively is joined to the first one.
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Step4:
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F INAL STRUCTURE
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Effects on Mega Float
1.Influence of Fluttering of Mega Float
2. Effect and Control Of Drifting
3.Earthquake Effect
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Influence of Fluttering of Mega Float
1.Since it is huge, fluttering of waves does not
have any impact.
2.Since it is made of steel its flexible like spring
3.As the skyscraper absorbs the seismic energy by
its flexibility, Mega-Float absorbs the energy of
waves by its flexibility
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Effect and Control Of Drifting
1.A structure called Dolphin is used to fix the
Mega Float at a place.
2.Its fixed into position by piling to Seabed.
3.Rubber fender is provided between floating
structure and dolphin so that it receives the
drifting force gently.
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Mooring and Piling of Mega
Float
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Earthquake Effect
1.Floating on the sea, moored to dolphin hence
does not get movement by earthquake
2.Huge structure does not touch the sea bed
directly since it is fixed to seabed by piling,
hence it can resist the earthquake effect
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Existing Mega FloatStructures
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KAMIGOTO Oil Storage Base, Nagasaki
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UZINA Port mooring pier, Hiroshima
b i h id f b ildi l h l
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Dubai, the idea of building a luxury hotel
66 feet underwater!
Floating and rotating hotel tower Dubai
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Floating and rotating hotel tower, Dubai
25 stories high floating hotel tower rotates 1
degree every minute
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CONCLUSION
1.VLFS is a unique concept of ocean structures.
2.VLFS requires massive investment of resources and is considered as a
mega project.
3.Technology utilized in the project must be well proven or reliable to
reduce risk of investment.
4. VLFS, the reader may refer to a large body of references
given in a recent literature survey paper by Watanabe et
al.
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References
1.www.amazon.com
2.http://www.srcj.or.jp/megafloat
3. www.mendeley.com
4.Endo,h(2000) the behaviour of a vlfs
5.Eatock taylor and ohkusu (2000) green
functions for hydroelastic
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