TENSILE STRUCTURES

1. TENSILE STRUCTURES
SUBHADIP MONDAL
SOUKTIK BHATTACHERJEE
KETAN SHING
ANIRUDTH RATHI
NAINEEK CHANDRA
SOUMO SARKAR

2. CONSTRUCTION ELEMENTS CARRYING ONLY TENSION AND NO
COMPRESSION OR BENDING.
TYPE OF STRUCTURE( WITH TENSION MEMBERS)
LINEAR STRUCTURE 3D STRUCTURE SURFACE STRESS
STRUCTURE
*SUSPENSION BRIDGE
*Drapped Cables
*cable trusses
*straight tension
cables
*Bicycle wheel
*3d cable truss
*tensegrity structure
*pre- stressed
members
*pneumatic stressed
*grid sheel
*fabric structure

3. FABRIC STRUCTURES – ARE FORMS OF CONSTRUCTED FIBRES THAT PROVIDES END USER
A VARIETY OF AESTHETIC FREE FROM BUILDING DESIGNS.
ADVANTAGES
*UNIQUE DESIGNS
*HIGHT WEIGHT AND
FLEXIBLE
*ENVIRONMENTALLY
SENSITIVE
*HIGH STRENGTH
WIEGHT RATIO
DISADVANTAGES
*BRITTLE TO NO
RIGIDITY
*LOSS OF TENSION
IS DANGEROUS TO
STABILITY
*THERMAL VALUES
LIMIT USE

4. TYPES OF FABRIC STRUCTURES
1.SUDDLE ROOF
2. MAST SUPPORTED ROOF
3. POINT SUPPORTED ROOF
4.ARCH SUPPORTED ROOF
5.COMBINATION ROOF

5. ARCHITECTURAL FABRICSANDFOILS
COATED FABRICS
*coating + fabrics
*applied on both side or
several layers
1.PVC coated polyester fabric
*most used tensile member
*used in Olympic games, London
2.THV coated polyester fabric
*better behaves in weathering resistance
*self cleaning properties
*light transience
*UV resistant
3.PTFE coated glass fibre fabrics
*most durable membrane material
*expected service life over 25 years
*good light transience
*used in Berlin Brandenburg Airport and Burj-al-Arab
4. Silicone coated glass fabrics
*chemical attack resistant
*UV resistant
*attracts dirt
*surface charges up statically
*expensive manufacturing process
*used in Zenith Concert Hall, Strasbourg

6. ARCHITECTURAL FABRICSANDFOILS
OPEN MASH
FABRICS
*these are made by same fibre and
coating used for COATED FABRICS but
they are designed with specific level of
permeability of light , wind and rain
*knitted high density poly ethylene
shade fabrics and probably one of the
most promising material due to the
extreme reduced cost , relatively high
life span and extraordinary elasticity

7. ARCHITECTURAL FABRICSANDFOILS
FOILS
1.ETFE foil
*most stable chemical compound
*long term ability
*high light transience
*mechanical strength is good
*used in Beijing Acoustic Centre ,
University Building, Hamburg
2.PVC foil
*poor mechanical resistance
*long term stability
*resistant to soling
*high flexibility
*extremely low cost
*used in Finmeccanica Pavilion, formbruah ,
International Air Show .
3.PE foil
*extremely low price
*very poor UV and soling resistant
*confined to greenhouse agricultural field.
*used in temporary pavilion- Mobile Action Space in
Berlin

8. ARCHITECTURAL FABRICSANDFOILS
FOILS
4.THV foil
*good flex cracking resistance
*long term stability
*optical properties and resistant to soiling
*easily welded( high frequency)
5. PU foil
*flexible in cold weather
*resistant to abruption and air tightens
*relatively high price
*low elastic modules
*progressive yellowing
*poor performance at high temperature
*polyurethane comes in 2 variation – 1. polyester
based 2. polyether based
*can be recycled easily
*does not release any hazardous components when
being processed or recycled

9. CONCLUSION
Although tensioned fabric structures are relatively new in the
engineering field, a lot of innovation has already occurred. However,
there are still many concerns and limitations with these structures.
First, with such a short history of existence, the complete behavior of
tensioned fabric structures is yet to be known. Second, although current
computer programs do an adequate job of form-finding and load
analyzing. Lastly, the limiting factor of tensioned fabric structures lie
within the fabric itself. Although tensioned fabric structures claim to be
"permanent" as well as temporary structures, some will argue that the
durability of the current fabrics do not allow for long lasting
structures.