A2: Duane

          While designing the bridge, the group kept the constraints in mind-the bridge has to be at least two feet long and have a certain width.  The group began by coming up with a basic design and modifying it from there.  parts were added and taken off to build a stronger bridge.  

This figure shows the design in the first stage.  Once this design was complete, the group evaluated the bridge.  It was determined that the bridge would be able to hold a large amount of weight, however; the bridge would begin to twist.  

This figure shows the plan.  Modifications were later made to this design.  The width was shortened by replacing the horizontal pieces with shorter pieces.  This allowed for the truss design to be used on the top and bottom of the bridge, creating an overall stronger and safer design.  

This figure shows elevation of the design.  The one major design flaw is that the bridge begins to twist when under pressure.  This flaw was fixed by connecting additional pieces from one side to the other about halfway up the height of the bridge.  From this first design, the group has learned what works and what does not work.  The group further understands which pieces work best with others.

This is the Truss Bill of Materials.  As shown, the total cost of the design is $189,9000.  This cost will change drastically throughout the design process.  It will most likely increase because the group plans on adding more pieces to stop the bridge from twisting under pressure.