Introduction to Tensioned Fabric...
Transcript of Introduction to Tensioned Fabric...
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Introduction to Tensioned Fabric Structures
Denver Airport, Denver, CO
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Learning Objectives
After listening to this presentation you should be able to:• Understand the concepts of analysis, design, fabrication and
installation of tensioned fabric structures.• Understand the structural characteristics and physical properties of
architectural fabrics.• Understand the requirement for pretensioning and clamping for the
installation of tensioned fabric.• Understand the methods for patterning and fabricating architectural
fabrics.• Identify the practical applications for tensioned fabric structures.
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Definition of Tensioned Fabric Structure
A cover or enclosure in which fabric is pre-shaped and pre-tensioned to provide a shape that is stable under
environmental loads.
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OverviewBackgroundStructural CharacteristicsMaterialsEnvironmental IssuesPerformance IssuesTechnologyApplications for Tensioned Fabric
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Background
Types of Fabric Structures
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Conven&&onal Tent
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Air-supported Air Fabric Structure
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Air-inflflated Air Fabric Structures
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Tensioned Fabric Structures
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Background
Fabric Engineers – Ancient and Modern
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St. Paul – Tentmaker
And because he was of the same craft, he abode with them, and wrought: for by their occupation they were tentmakers.
Acts 18:3
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Omar the Tentmaker
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Frei Otto
Founded the famous Institute for Lightweight Structures at the University of Stuttgart.
Major Structures:Munich Olympic Arena Montreal Expo
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Horst Berger
Graduated from University of Stuttgart.
Came to USA in 60’s and founded Geiger Berger Associates.
Major Structures:Haj Terminal, JeddahDenver Airport
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Munich Olympic Stadium, Munich, Germany1972 Olympics
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BC Place, Vancouver, BC, Canada
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Georgia Dome, Atlanta, GA
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Structural Characteristics
Analysis of Forces
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Conventional Structures
Internal rigidity (stiffness)Beams and columnsLoad resistance in bending and shearLinear behavior
Fabric Structures
Form and prestressCables and membraneLoad resistance in tension
Non-linear behavior
Structural Behavior
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� =� (�� + ��)
��
� = � ��
�+ �
���
���
(approximate)
�� = ���
�´ = � + ��
�´ = �
� �´� − ��
Catenary with Uniform Load
F = cable force
A = arc length
w = uniform load
l = span length
h = cable sag
E = elastic modulus of cable
A
l
wF h
Analysis of Catenary Forces
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Anticlastic shape
Tension in both directions
Fabric prestress resists the external forces
Design of the Fabric Envelope
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Analysis
Finite element analysis
Large deflection theory
Balanced forces
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Structural Characteristics
Shapes and Anchoring Systems
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The properties of fabric limit the range of shapes available for membrane.
Cone
Rigid-and-Valley
Saddle
Shapes Available for Fabric
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Hypars Cone
Suppor&&ng and Anchoring System
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Parallel Arches Crossed Arches
Suppor&&ng and Anchoring Systems
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Cones and Hypars
Suppor&&ng and Anchoring Systems
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Jacking columns
Jacking struts
Pretensioning
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Pretensioning
Pulling roped edgesPulling catenary cable edges
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Connections
Fabric-to-Fabric
Fabric-to-Rigid Edge
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Connections
Fabric-to-Cable
Cable-to-Cable
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Connections
Cable-to-Mast
Cable-to-Rigid Edge
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Connections
Rigid-Sectionalizing
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Materials
Substrate and Coatings, Characteristics and Physical Properties
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Coating Materials• Polyvinyl Chloride (PVC)• Polytetrafluoroethylene
(PTFE) (Teflon)• Others (e.g. Silicon)
Fabric ConstructionConventional WovenFlat Weave FabricOpen Weave Fabric
SubstratesFilament Materials Substrates
Glass Fiber (Fiberglas)Polyester (Dacron)
Top Coating Materials• Acrylic• Tedlar Laminate• Polyurethane
Substrates and Coa..ngs
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MaterialsPTFE Glass Fiber
• White only• Relatively high manufacturing
cost• Long service life• Joint strength equal to the fabric
strength• Translucency reflects most solar
heating• Classified as non-combustible
PVC Polyester
• Colors• Relatively low manufacturing
cost• Short service life• Requires top coat to prevent
UV degradation• Poor dimensional stability –
May require re-tensioning• Smoke generation is too high
for high-occupancy applications
Characteris**cs of Composite
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PTFE Glass Fiber• Coated Fabric Weight, oz./sq. yd.
ASTM 4851 38-45.5• Thickness, mils
ASTM 4851 28-36 • Strip Tensile, lbs./inch
ASTM 4851Dry, Warp 640-975Dry, Fill 640-900
• Trapezoidal Tear, lbs./inchASTM 4851
Dry, Warp 60-95Dry, Fill 65-120
PVC Polyester• Coated Fabric Weight, oz./sq. yd.
ASTM D751 28-34
• Strip Tensile, lbs./inchASTM D751
Warp 515-650Fill 515-650
• Trapezoidal Tear, lbs./inchASTM D751 85-100
Physical Proper..es
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Environmental Issues
Thermal and Lighting Prosperities
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TranslucenceDaylightingBacklightingInsulation
Thermal and Ligh..ng Proper..es
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Thermal and Lighting Properties
Assembly
Properties Conventional Roofing PTFE Glass Fiber PVC Polyester Fiber
Solar Properties (%)
Reflectance 10%-50% 70%-75% 30%-60%Absorption 50%-90% 12%-18% 13%-65%
Transmission 0% 7%-18% 2%-12%
R-valueFlat metal roof with 3 inchs of insulation R-9 R-1 R-1
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Light intensity and quality
Illumination of roof forms
Effects of dirt accumulation
Solar Transmission ASTM E424 10% -16%
Solar ReflectanceASTM E424 70%-73%
Thermal and Ligh..ng Proper..es
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Environmental Issues
Energy Impact
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Energy Impact
Low insulating abilityLow thermal mass
High reflectivity of lightLow to moderate translucency
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Energy Impact
VS
Decreased lighting use because of moderate translucency
Decreased cooling load because of high reflectivity
Increased heating load because of low insulation value
Energy Usage Trade-off
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Environmental Issues
Weather and Acoustics
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Sufficient slope to prevent rain ponding.
Sufficient slope to shed snow.
5% slope on a structureloaded with a 10 psf uniform load.
Adverse Weather Condi00ons
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Acoustics
Single layer fabric offers a poor barrier to sound transmission and high reflectivity of sound vibrations.
Liners are often added where there is concern.
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Performance Issues
Fire Safety, Security and Maintenance
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Fire SafetyLow mass of fabric material
Higher and larger internal spaces
PTFE Glass Fiber
NFPA 701 Non- combustible
ASTM E84 Flame Spread - 5 max
ASTM E108 Burning Brand - Class A
NFPA 701 Fire-retardant
PVC Polyester
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Security
Keep fabric out of people’s reach
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Maintenance
PTFE Glass Fiber• Self-cleaning in areas with some
rainfall• Very little creep – no re-tensioning
PVC Polyester • Degradation by UV and can collect dirt• Creep – may require re-tensioning
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Technology
Analysis and Design Example
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Design Parameters
Typical Levels
4%-10% of breaking strength for cables
35 pli-45 pli for heavy PTFE/glass
20 pli-35 pli for light PTFE/glass
7 pli-15 pli for light lining PTFE/glass
7 pli-35 pli for PVC/polyester
Design Concept and Development
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Design of supporting framework:
• fabric• arches• masts• anchorages• cables• weldments
Design Concept and Development
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Develop a practical geometric shape:
• Form-finding
• Prestress
• Perform centerline
analysis
Design Concept and Development
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Determine the structural loading:
• Wind
• Snow
• Rain (ponding)
• Special loads (point loads,
e.g. lighting)
Design Concept and Development
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Fabric stresses – warp direction Fabric stresses - fill direction
Design of components -‐ fabric
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Moment Diagrams
Design of Components – Steel
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Check that beam is satisfactory using steel design formulae.
Design of components -‐ Steel
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Steel Sizes
Design of components -‐ Steel
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Compute the reactions for the prestress, dead and live loads cases, including combined load cases.
Reac%%on Loads
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Technology
Fabric Patterning and Fabrication
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Prepare patterning models and determine the location and design of the seams.
Genera&&on of Fabric Pa//erns
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Architectural fabric is manufactured and delivered to the fabrication shop in rolls. PTFE Glass Fiber comes in rolls 12 feet wide x 200 yards.
Receive materials and perform visual and laboratory tests.
Fabric Manufacture and Delivery
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Lay out the fabric sub panels to full size using measured offsets or computer plotting methods.
Plo$$$ng/Cu$$$ng Machine
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Heat Sealing
Seal fabric with thermal heat sealing devices.Seal fabric assemblies as designed in a clean handling environment.
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Consideration should be given to the installation procedure and how the fabric will be “unfolded”.
Packing in the form of tubes and bubble wrap are necessary to keep from creasing the fabric.
Factory Folding
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Technology
Installation
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Installation
Plan and execute the rolling or folding of the fabric assemblies as required by the Installation Plan with care to not crease or otherwise damage the fabric.
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Installation
Site installation planning• method of pretensioning• field jointing • equipment limitations
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InstallationWater drainage and removal
pondingflashing gutterscone tops
Coordination with other tradesfoundationselectricalmechanical
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Applications for Tensioned Fabric
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Inchon Stadium, Inchon, South Korea
Recrea&&onal -‐ Sports Venues
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Meyer Amphitheater, Palm Beach, FL
Recrea&&onal -‐ Entertainment
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Commercial
Brentwood Mall, Vancouver, BC Canada
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Institutional
Sky Song, Arizona State University, Phoenix, AZ
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TRI Rail Miami Airport, Miami, FL
Transporta))on
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ReferencesArchitectural Fabric Structures, Federal Agencies, 1985
Tensioned Fabric Structures, Edited by R. E. Shaeffer, 1996The Tensioned Fabric Roof, Craig G. Huntington, 2004
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Questions and Discussion
RDU Airport Parking Structure, Raleigh, NC