Thames & Kosmos Structural Engineering: Bridges & Skyscrapers handleiding
Handleiding
Je bekijkt pagina 34 van 48

CHECK IT OUT
Structural Elements:
Catenaries, Cables,
Arches, and Shells
The tensegrity is a
structure that has
compression elements
(in this case rods) held
together by tension
elements (in this case
strings).
The Gateway Arch in St.
Louis, Missouri is a flaened
catenary, because the arch
gets narrower near the top.
CATENARIES
Hold both ends of a piece of string and let it hang
down freely in the middle. Observe the shape that the
string forms naturally under its own weight. This
curve is called a catenary. Ropes, chains, and
cables assume this shape as a result of the
way in which gravity pulls down on them.
ARCHES
As you learned in
Experiment 15, arches
transform forces that
push down on them
into forces that push
outward at their bases.
This is due to the
curved shape of arches.
The optimal shape for an arch of uniform density and
thickness that needs to support only its own weight is a
catenary that has been flipped upside down. This is
because a catenary is the most efficient shape for turning
the force of gravity into the compressive forces that are
transferred through the arch to the ground.
A rope bridge is the most basic type of
bridge that uses cables. The cables of a
free-hanging rope bridge follow a
catenary curve.
CABLES
Now thread the string through a 5-hole rod.
Hold the string at both ends and let it hang
down freely in the middle again. Notice that
the string now forms two straighter lines and
you feel a slight pull from the string on both
of your hands. Chains, ropes, and cables can
only provide support by pulling on another
structural element through tension.
SHELLS
Like plates, shells are
structural elements
with thicknesses that
are much smaller
compared to their other
dimensions. However,
shells are curved
structures, while plates
are flat. Shells can
produce both tension
and compression
.
31
Structural Elements: Catenaries, Cables, Arches, and Shells
Bekijk gratis de handleiding van Thames & Kosmos Structural Engineering: Bridges & Skyscrapers, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
Merk | Thames & Kosmos |
Model | Structural Engineering: Bridges & Skyscrapers |
Categorie | Niet gecategoriseerd |
Taal | Nederlands |
Grootte | 30998 MB |