sirouliyako
Tensile
struture for doubly curved fabric
structures are PTFE-coated fiberglass and PVC-coated polyester. These are
woven materials with different strengths in different directions. The warp
fibers (those fibers which are originally straight—equivalent to the starting
fibers on a loom) can carry greater load than the weft or fill fibers, which
are woven between the warp fibers.Tensile
structures make use of ETFE film, either as single layer or in cushion form
(which can be inflated, to provide good insulation properties or for aesthetic
effect—as on the Allianz Arena in Munich). ETFE cushions can also be etched
with patterns in order to let different levels of light through when inflated
to different levels.In daylight, fabric
structure translucency offers soft diffused naturally lit spaces, while at
night, artificial lighting can be used to create an ambient exterior
luminescence They are most often supported by a structural frame as they cannot
derive their strength from double curvature.Cables can be of mild steel, high
strength steel, stainless steel, polyester or aramid fibres.Tensile structural are made of
a series of small strands twisted or bound together to form a much larger.Steel
are either spiral strand, where circular rods are twisted together and "glued"
using a polymer, or locked coil strand, where individual interlocking strands
form the structure.Spiral strand is slightly weaker than locked coil strand.
Steel spiral strand cables have a Young's modulus,citation needed] Spiral
strand suffers from construction stretch, where the strands compact when the
cable is loaded. This is normally removed by pre-stretching the cable and
cycling the load up and down to 45% of the ultimate tensile load.The behaviour
of tensile structures which
depend upon prestress to attain their strength is non-linear, so anything other
than a very simple cable has,been very difficult to design. The most common way
to design doubly curved fabric
structures was to construct scale models of the final buildings in order to
understand their behaviour and to conduct form-finding exercises.
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