Bridges Part 4: The Warren Truss / Ponts a Treillis Warren

For this third bridge, I'm going to show another truss made from equilateral triangles. In the kit the Warren Truss looks like this:

My Frameworks version looks like this:

For this bridge you need:

2 plinths (see previous post here)

      20 equilateral triangles

      8 squares

Bridge

      22 equilateral triangles

      11 squares or 5 frameworks squares and 6 full squares for the road bed

      2 right angle triangles

    

Here's the flat layout of the above bridge:

 

Here's the flat layout using only Frameworks pieces:

 

In the Polydron Bridges kit they add squares at each end of the bridge for stability because without them the bridge will lean.

 

 

Because my plinth construction is slightly different, you can't use squares, so I've added right angle triangles instead:

Pictures of real bridges:

 

In Illinois

 

In Kentucky

 

In Alabama

 

 

Links:

Truss bridges on Wikipedia

Warren trusses on Garrett's Bridges

 

 

En Francais:

Ponts a treillis sur Wikipedia

Ponts a treillis sur Gramme