Civil Engineering Reference
In-Depth Information
fabric is ideally suited in deployable, seasonal and moveable roof systems where its
flexibility and high strength are uniquely combined as shown in Figure 3-4. The use
of this fabric is relatively recent (10 years), but is growing in popularity.
Figure 3-4
Deployable Bandshell, City Place, FL
PTFE woven fabric
Aramids
The aramids or polyaramids consist of Kevlar and Vectran and are organic materials.
They can be made to have a high modulus of elasticity and high breaking strength.
The aramids can withstand considerably more flexing than glass but not as much as
the polyester or expanded PTFE fibers as shown in Figure 3-5. They are generally
considered non combustible, but degrade under UV light relatively quickly and as a
result need to be encapsulated or sheathed to protect their strength. However they
work well in wet applications and are often used as a rope replacement for steel
cables in deployable structures. They are relatively expensive to manufacture, but
well worth their cost for special applications where their unique characteristics are
important.
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