Folded Plates Atia

8/11/2019 Folded Plates Atia

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FOLDEDPLATESBY ATIA KHURSHEED


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FOLDEDPLATES

Folded plates are assemblies of flat plates rigidly connected together aloin such a way so as to make the structural system capable of carrying loaneed for additional supporting beams along mutual edges.

They consist of flat coor plates, that are inte

at some dihedral angcross section which iscarrying a load over

Concrete, steel, timber,


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Understandingthe basicfunctioning offolded plates.

The effect of folding platescan be visualized with a sheetof paper. A paper deformseven under its own weight.Folding the paper adds

strength and stiffness; yetunder heavy loads the foldsmay buckle. Securing thefolds at both ends, increasesstability against buckling.

1.Flat paper deformsunder its own weight.

2. Folding paperincreases strength and

stiffness.

3. Paper bu

4. Secured ends help resistbuckling.


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FOLDEDPLATEBEHAVIOUR

Folded plates combineslab action with beamaction. In lengthdirection they act likethin inclined beams ofgreat depth, stabilizedagainst buckling at topand bottom by adjoiningplates. In width directionthey are one-way slabsthat span betweenadjacent plates.

Slab action in width direction.

Slab and beam equivalent.

Beam action in le

A Bending dcauses top antension.B Horizontal compression aC- Vertical sheat supports an

span.


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FOLDEDPLATEBEHAVIOUR

Bending in folded platescauses top compressionand bottom tension.Folded plates also tendto flatten out under

gravity load, which maybe prevented by wallsor frames at endsupports. Tendency ofend buckling can beresisted by edgebeams.

Bending visualized as externalcompression and tension

forces.

Flattened foldedplate under

gravity load.

Folded platewith walls and

frames to resistflattening.

Buckled endpanels.

C- Edge beampanel against A- Stabilizing wfor long systemB- Stabilizing fr

and, for long sspan

A


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ADVANTAGES

The distinguishing feature of the folded plate is the ease in formingplane surfaces. Therefore, they are more adaptable to smallerareas than curved surfaces which require multiple use of forms formaximum economy.

A folded plate may be formed for about the same cost as ahorizontal slab and has much less steel and concrete for the samespans.

Provide strength, stiffness, and stability with minimum weight.


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TYPESOFFOLDEDPLATES: FOLDINGTECHNIQ

Longitudinal /Prismatic folding:

Longitudinal folding is characterizedthrough uninterrupted and linked foldingedges where parallel and skew up foldsand down folds alternate

Single-layered longitudinal foldingcorresponds in their load bearing structure

to a linear load bearing system.

Double-layered folding with differentdirections of their folds can create thestructural condition of the plate.

Spot / facet fold

Spot or facet folding requireintersect like a bunch in oneresults in pyramidal folds witfacet-like planes. Facet fold

based on a triangular shapquadrangular shape.

A single or double-layered fresembles the load bearingplate and can be compareframeworks.


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TYPESOFFOLDEDPLATES: PLANESHAPE

PrismaticThey consist ofrectangular plates.

PyramidalWhen non-rectangularplates are used.

OthersPrismoidal, triatrapezoidal.


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TYPESOFFOLDEDPLATES

Single

Multiple.

Symmetrical.

Unsymmetrical. Simple.

Continuous.

Folded plates with simple j

Folded plates with multiple

Folded plates with openedsectional.

Folded plates with closed sectional.


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One Edge Fold Two Edge Fold

Twin Fold Folded Roof and Wall


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GUNMAMUSICCENTER, JAPAN

LOCATION: TAKASAKI, JAPAN

ARCHITECT: ANTOINRAYMOND

ENGINEER: TSUYASHIOKAMOTO


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GUNMAMUSICCENTER

This Gunma music center for the Gunma Philharmonic Orchestra,consist of a folded plate concrete roof of 60 m span and foldedplate walls, that form frames to resist gravity and lateral loads.The architect, a former student of Frank Lloyd Wright at Taliesintook the challenge to design the center for the followingrequirements :

The center had to be fire and earthquake proof

Good acoustics for music center.

Provide for Kabuki performances that required a revolving stage.

The folded plate roof is 3.3 m deep for a span/depth ratio of1:18. Two wings flanking the stage for meeting and green rooms,also have folded plate roofs.


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TAGOREMEMORIALHALL, AHMEDABAD


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TAGOREMEMORIALHALL

A series of rigid frames in reinforced concrete folded plates provide the outer she

Vertical folds are 17m high, increasing in depth from 1.15m at the base to 2.4m atconstant plate thickness of 15cm.


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TAGOREMEMORIALHALL

Horizontal folds are 2.4m deep and span 33.5m with a platethickness of 10cm increasing to 15cm near the supports.

Inside the hall, a 'seating bowl' with a capacity of 700 issupported on an independent structure.

Sculptural columns and cantilevers of this bowl dominate thelobby area.


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TAGOREMEMORIALHALL

The hall, located on thSabarmati River, is supindividual and strip fooon a sandy strata.

Folded Plates Atia

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