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How many triangles should you use in a truss bridge?

In: Civil Engineering, Bridges and Tunnels [Edit categories]

Answer:

As many as it takes.

Truss bridges should have triangles all over.
Openings that are not a triangle (that have 4 or more sides) are not stable.

First answer by DavidCary. Last edit by DavidCary. Contributor trust: 162 [recommend contributor ]. Question popularity: 1 [recommend question].

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Why do you use trusses in stabilizing bridges?
Add structural rigidity to the frame, which translates to less flex in winds and such.
How many truss bridges are there?
A lot.
How many truss bridges are there in Pennsylvania?
the answer is 45
Why is a truss bridge a triangle?
Because the shape of a triangle cannot change without changing the length of one (or more) of the sides. A triangle is inherently stable, until either the joints or the sides fail.
How many pillows should you use?
They say you should only use one. The second pillow will mess up your neck and also your spine.