Structure Designs & Photos of Bridges

This is the first Pratt Truss bridge we made in Bridge Designer. It could withstand the truck's weight, but did not meet the requirements and was not very stable.

Our second design met all the requirements, and the truck successfully crossed to the other side. However, the direction of the diagonals did not qualify for a Pratt-Truss bridge.

Our final design met all the requirements and fixed the direction of the diagonals to better represent a Pratt-Truss bridge at a total cost of $290,694.48

Once we had designed our bridge in Bridge Designer, we scaled it down in Model Smart 3D and modified it slightly to make sure it met the length and height requirements. We decided to add two extra beams on each side in the center to give it extra support. It passed a load test of 1950 pounds when the weight was distributed between 10 joints and a load test of 1250 pounds when distributed between the two center joints. We then transferred the design to TinkerCAD.

We scaled the bridge down again in TinkerCAD and sent it to PolarCloud for 3D printing.