Deploy Able Structures Ppt

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Deployable structuresDeployable structures

ByBy

Rajesh. GRajesh. G

1EW10CSE111EW10CSE11



IntroductionIntroduction

Deployable structuresDeployable structures::-- capable of capable of undergoing large configuration changes in undergoing large configuration changes in

an

auton

omous way.an

auton

omous way.Uses of Deployable structureUses of Deployable structure::--

Easy StorageEasy Storage

TransportationTransportation



DTSSDTSS

Deployable TensionDeployable Tension--Strut Structures(DTSSs)Strut Structures(DTSSs)are:are:

Composed of strutsComposed of struts High strength tension elementsHigh strength tension elements



Types of DTSS:Types of DTSS:

PyramidPyramid--onon--Pyramid structure (POP)Pyramid structure (POP)

PyramidPyramid--inin--Pyramid structure (PIP)Pyramid structure (PIP)

PyramidPyramid--PantographPantograph--Cable structure (PPC)Cable structure (PPC) PyramidPyramid--PantographPantograph--Pyramid structurePyramid structure

(PPP)(PPP)



PyramidPyramid--onon--Pyramid structurePyramid structure

(POP)(POP)



POPPOP

Composed of two pyramids attached toComposed of two pyramids attached toeach other at their base.each other at their base.

Pyramid consists of four struts, Pyramid consists of four struts,connected in the centre by a pinned joint.connected in the centre by a pinned joint.

DisadvantageDisadvantage::--

Poor in resisting uplifts loads, which mayPoor in resisting uplifts loads, which may

require additional layer of cables in require additional layer of cables in conditions where the uplift loads mayconditions where the uplift loads mayexceed the self weight of the structure.exceed the self weight of the structure.



Multiple modules POP Structure:Multiple modules POP Structure:



PYRAMIDPYRAMID--ININ--PYRAMIDPYRAMID

STRUCTURE (PIP)STRUCTURE (PIP)



PIPPIP

Composed of two pyramids attached at Composed of two pyramids attached at the base to each other but within eachthe base to each other but within each

other.other. Pyramid are formed by four pinned Pyramid are formed by four pinned

connected struts as in POP Structures.connected struts as in POP Structures.

The deployable of a PIP is achieved byThe deployable of a PIP is achieved bysliding the central joint along the centralsliding the central joint along the centralrod and locking in its final configuration.rod and locking in its final configuration.



POP Vs PIPPOP Vs PIP

PIP Structure is in the central rod, whichPIP Structure is in the central rod, whichin the case of a POP structure is in tension in the case of a POP structure is in tension and in the PIP is in compression.and in the PIP is in compression.

If the central rod is made of cable(in POP)If the central rod is made of cable(in POP)and struts(in PIP) then the variations in and struts(in PIP) then the variations in their modules and the higher crosstheir modules and the higher cross

sectional area of the compressive strut sectio

nal area of the compressive strut contribute to the higher stiff ness of thecontribute to the higher stiff ness of the

PIP.PIP.



Multiple module of PIP StructureMultiple module of PIP Structure::



PYRAMIDPYRAMID--PANTOGRAPHPANTOGRAPH--CABLECABLE

STRUCTURE (PPC)STRUCTURE (PPC)



PPCPPC

A new class of structures which consist of A new class of structures which consist of scissorscissor--like elements (SLEs) and pyramidallike elements (SLEs) and pyramidalelements.elements.

The structure is stabilized into the deployedThe structure is stabilized into the deployedstate by attaching the locking cables to the topstate by attaching the locking cables to the toppivot.pivot.

Under gravity loads the compressive forces areUnder gravity loads the compressive forces areresisted by the top pyramid struts, the tensileresisted by the top pyramid struts, the tensile

forces are resisted by the network of cables at forces are resisted by the network of cables at the bottom of the structure and the shear forcesthe bottom of the structure and the shear forcesare resisted by the SLE systemare resisted by the SLE system..



Multi module of PPC Structure:Multi module of PPC Structure:



PYRAMIDPYRAMID--PANTOGRAPHPANTOGRAPH--PYRAMIDPYRAMIDSTRUCTURE (PPP)STRUCTURE (PPP)



PPPPPP

The PyramidThe Pyramid--PantographPantograph--PyramidPyramidstructure (PPP) is another SLEstructure (PPP) is another SLE--basedbasedsystem.system.

The structure is deployed and stabilized byThe structure is deployed and stabilized byattaching and preattaching and pre--stressing the centralstressing the centrallocking cable.locking cable.

The PPP system can resist both gravityThe PPP system can resist both gravityand uplift wind loads efficiently.and uplift wind loads efficiently.



Multiple modules of PyramidMultiple modules of Pyramid--

Pan

tographPan

tograph--Pyramid structurePyramid structure



STRUCTURAL EFFICIENCY STRUCTURAL EFFICIENCY

Determining the suitability of anyDetermining the suitability of anyproposed structural system for practicalproposed structural system for practicalimplementationimplementation

Tension structures are highly flexible in Tension structures are highly flexible in nature, a nonlinear large displacement nature, a nonlinear large displacement inelastic analysis is used to investigateinelastic analysis is used to investigate

their loadtheir load displacement behavior and todisplacement behavior and toderive their optimum configurations toderive their optimum configurations toachieve maximum structural efficiency forachieve maximum structural efficiency for

design implementation.design implementation.



DESIGN PROCEDUREDESIGN PROCEDURE

Elastic analysisElastic analysis

Factored loadsFactored loads

Service loadsService loads Ultimate Limit State condition Ultimate Limit State condition

Serviceability Limit State condition Serviceability Limit State condition



POP Structure

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

4 8 10 12

No of Modules

S E I

Span 60m

Span 48m

Span 36m

Span 60m

PIP Structure

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

4 8 10 12

No of Modules

S E I

Span 60m

Span 48m

Span 36m

Span 60m

PPC Structure

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

4 8 10 12

No. of modules

S E I

Span 60m

Span 48m

Span 36m

Span 60m

PPP Structure

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

4 8 10 12

No of Modules

S E I

Span 60mSpan 48m

Span 36m

Span 60m



COMPARATI VE STUDY COMPARATI VE STUDY

The least efficient of the DTSSs is chosen The least efficient of the DTSSs is chosen to explain structural efficiencyto explain structural efficiency

The effects on

SEI, which i

ncreases byThe effects o

nSE

I, which i

ncreases by75% on average when it changes from75% on average when it changes from

0.15 to 0.080.15 to 0.08

E



DEPLOY MENT CHARACTERISTICSDEPLOY MENT CHARACTERISTICS

The pantographs structures duringThe pantographs structures duringdeployment deployment

Thenon

Thenon--pa

ntographic structures requirepa

ntographic structures requiremanual coordination as each unit is not manual coordination as each unit is not

strongly linked to other unitsstrongly linked to other units

Gravity loads are found to be sufficient toGravity loads are found to be sufficient tocause the deployment of these modelcause the deployment of these modelstructuresstructures



CONSTRUCTION OF JOINT IN CONSTRUCTION OF JOINT IN

DEPLOYABLE STRUCTURESDEPLOYABLE STRUCTURES Joint must assure scissorJoint must assure scissor--link bars rotatinglink bars rotating

freely. So there is no larger friction andfreely. So there is no larger friction anddeformation of bending between the jointsdeformation of bending between the joints

and bars.a

nd bars.

Assuring bars packaged in a small volume Assuring bars packaged in a small volumefor convenience in storage.for convenience in storage.

There should be enough strength for joint There should be enough strength for joint

to bear axial force, also local shearingto bear axial force, also local shearingforce, bending moment and bearing force.force, bending moment and bearing force. Also, it should meet some special Also, it should meet some special

requirements in construction.requirements in construction.



STRESS AN ALYSIS FOR PLATESTRESS AN ALYSIS FOR PLATE

The thickness of plates and diameter of The thickness of plates and diameter of hole their strength requirementshole their strength requirements

Forces inside the pla

ne of the plateForces i

nside the pla

ne of the plate

The direction and value of the forceThe direction and value of the forceoutside the plane of the plate make nooutside the plane of the plate make noobvious difference for its stressobvious difference for its stress



Case StudyCase Study

This is one of the prototype of POP structures.



The Louvre Pyramid in Paris is aThe Louvre Pyramid in Paris is a20.6m(70ft) glass structure which acts as20.6m(70ft) glass structure which acts asan entrance to the museum.an entrance to the museum.

The Luxor Hotel in Las Vegas, UnitedThe Luxor Hotel in Las Vegas, UnitedStates, is a 30States, is a 30--story pyramid with light story pyramid with light beaming from the top.beaming from the top.



CONCLUSIONCONCLUSION

DTSSsDTSSs deployment deployment isis mademade possiblepossible bybythethe useuse of of detachabledetachable elementselements.. PreviousPreviousdesignsdesigns of of deployabledeployable structuresstructures

compromisedcompromised theirtheir structuralstructural efficiencyefficiencytoto achieveachieve deployment deployment

TheThe different different typestypes of of DeployableDeployableTensionTension--Strut Strut StructuresStructures areare discusseddiscussedusingusing thethe parametricparametric studiesstudies byby findingfindingstructuralstructural efficiencyefficiency indexindex (SEI)(SEI) basedbased ononthethe different different spanspan toto height height ratiosratios of of

structuresstructures anda

nd differe

nt differe

nt

number

number of of



TensionTension--Strut Strut StructuresStructures fallsfalls inin thetherangerange 88 toto 1010 andand that that thethe optimumoptimumnumbernumber of of modulesmodules inin thethe spanspan directiondirection

isis 66 toto 1010,, resultingresulting inin anan optimumoptimum widthwidthtoto height height ratioratio (of (of eacheach module)module) of of 00..8080toto 11..3333.. TheThe self self--weight weight of of thethe DTSSsDTSSswithwith pantographs,pantographs, suchsuch asas PyramidPyramid--

Pan

tographPan

tograph--CableCable StructureStructure (PPC)(PPC) an

dan

dPyramidPyramid--PantographPantograph--PyramidPyramid StructureStructure(PPP),(PPP), isis foundfound toto bebe slightlyslightly higherhigher thanthanthethe otherother systemssystems;; thethe most most efficient efficient configurationconfiguration waswas foundfound toto bebe PyramidPyramid--inin--PyramidPyramid StructureStructure (PIP)(PIP) andand thethe least least efficient efficient toto bebe PyramidPyramid--PantographPantograph--PyramidPyramid StructureStructure (PPP)(PPP)..



Significant benefit can be gained bySignificant benefit can be gained bymaking structures deployable due tomaking structures deployable due totheir potential savings in terms of their potential savings in terms of

transportation cost and erection andtransportation cost and erection anddismantling time.dismantling time.

The design procedure of a new type of The design procedure of a new type of joint for deployable structures joint for deployable structures WeldedWeldedSteel Plate Joint (WSPJ) is alsoSteel Plate Joint (WSPJ) is alsodiscussed.discussed.



Thank you««..Thank you««..

Deploy Able Structures Ppt

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