A2- Fischer

I went through many variations of the same bridge, trying to get it as close to 24 inches as possible. This is as close as I can get it while still sustaining a symmetrical shape. At first, I tried to follow the "Pratt Template" from the West Point Bridge Designer, but later found out that the pieces were not correctly sized to do so. 

Elevation (Side View)

My bridge comprises of 5" and 3.375" trusses. The diagonals are at 5" at 45 degrees, which are the only angled pieces in the bridge. The vertical and horizontal members are 3.375". The circles represent the gussets that connect the trusses. Ever circle is going to have 2, 180 degree grooved gusset plates, which allow the bridge to take a three dimensional form. 

Plan (Top View)

The top portion of the bridge shows the internals, or the web. It is fairly simply in my bridge, every gusset will have a 3.375" truss going in an orthogonal direction. 

Front View

This front view shows that this bridge does not contain a web.

Bill of Materials

Like I said before, this bridge went through many changes to try to get it to the correct size. I spent most of the time trying out the different sized trusses to see which ones will make it symmetric, but still in the ball park around 24". I was not able to make a cross section in the middle of the bridge (due to not having the correctly sized pieces), so I decided to add another "section of trusses" to one side to make both sides even.  I learned that planning a bridge without literally seeing the materials can be tough because you don't know what can fit where.