Dissertation:-Tensile Structures,P.M.AMAL

TENSILE TENSILE STRUCTURESTRUCTURE

SUBMITTED BY: P.M.AMALViii-SEM,SOA ,IPS ACADEMY, INDORE

A tensile structure is a construction of elements carrying only tension and no compression or bending. Examples of this are cables supporting a membrane of fabric or some other sheet material, or a simple suspension bridge. The term tensile should not be confused with tensegrity, which is a structural form with both tension and compression elements.

Tension structure are form of structures in which members exclusively designed to carry tension are major elements in the overall structure. Most structural elements are able to carry bending forces as well as tension and compression, and are hence able to withstands reversals in the direction of loading. Tension elements are unique in that they can only carry tension. In compressive or bending elements the loading capacity is often reduced by buckling effects, while tension elements can work up to the full tensile stress of the material.

DEFINITIONDEFINITION

STRUCTURAL STRUCTURAL PrinciplesPrinciples

Tension structures consists of cables and fabric in Tension structures consists of cables and fabric in tension. The cables carry the gravity loads while tension. The cables carry the gravity loads while stability and resistance to wind uplift is provided stability and resistance to wind uplift is provided by the weight of the roof deck system. The most by the weight of the roof deck system. The most common type, the cable dome, consists of a common type, the cable dome, consists of a center tension ring surrounded by a number of center tension ring surrounded by a number of hoop rings which are also in tension, these are hoop rings which are also in tension, these are surrounded at the perimeter by a compression surrounded at the perimeter by a compression ring.ring.By definition, the membrane can only resist By definition, the membrane can only resist forces in tension, so forces perpendicular to the forces in tension, so forces perpendicular to the membrane cause large deformations and large membrane cause large deformations and large membrane forces. And this is explain by taking an membrane forces. And this is explain by taking an simple example,simple example,

COSTS

As a very rough rule of thumb fabric structures are nearly always cheaper than planar glazing and more expensive than polycarbonate solutions.

They really come into their own in large span structures such as the Millennium Dome where the ratio of fabric to steel results in considerable savings over more conventional structures.

For smaller structures under 100m2 they can be relatively design intensive, however there are often pre-engineered solutions which can fit a tight budget.

Some examples where Some examples where tensile structures are used tensile structures are used

very efficientlyvery efficiently

interiorsinteriors

Office areas as a false ceiling element to diffuse light

As a display in exhibition areas

As a partition in area like

restaurants

AtriumsAtriums

AtriumsAtriumsThese tensile

structure elements can also be used to accentuate the big

atriums

Bridges Bridges

AuditoriumsAuditoriums

Tensile structure element acting as top covered background

element

The tensile structure in folded plate form

spans large auditorium sapce

without any support

Open Air TheatersOpen Air Theaters

Can act as a temporary roof

covering in such areas in during day

StadiumsStadiums

The tensile structure shading sitting areas and large pavilions in stadiums

Swimming poolSwimming pool

Acting as a temporary

shading device

providing efficient lighting

conditions in such big

areas

Exhibitions , Petrol pumpsExhibitions , Petrol pumps

Roof topsRoof tops

Canopies , covered pathwaysCanopies , covered pathways

More examplesMore examples

More examplesMore examples

More examplesMore examples

More examplesMore examples

Some detailsSome details

Some detailsSome details

Some detailsSome details

Structural behaviorStructural behavior

Distribution loadsVertex positions

exampleexample

Distribution of forces

Formation and behavior

Some analysis methodsSome analysis methods

Nodal forces

Distribution forces