Monday, March 26, 2018

behold the lowly bar joist

The Manhattan Bridge was built from 1901-1912 using a device
 known as the Warren Truss.

That “W” design dawned on British engineer James Warren
way back in 1848.

If he alternated triangular supports, the resulting truss was very light, and remarkably strong.

It worked well in big planes, too.

Today it’s called a “bar joist” and it is still used
in all kinds of buildings.

So of course they tried a bridge.

Worked great.

In fact our Manhattan Bridge is the first ever to be based
 on the Warren Truss.

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