The bridge I have designed out of knex is based off of the bridge I designed on WPBD. The biggest difference though is the materials used. Therefore, I modified the knex bridge a little bit to add more support because knex pieces can't support as much weight as metal or tubes can. I do plan on modifying the bridge much more though to make it as cheap as possible while still being a working bridge.
Elevation:
The bridge is made with 6 3-3/8" long chords on the top connected by 360 degree grooved gusset plates and 6 3-3/8" long chords on the bottom connected by 180 degree gusset plates. The corners are connected by 8 180 degree grooved gusset plates. The blue cross sections are made up of 4 2-1/8" long chords. They are connected with a 360 degree gusset plate in the middle. There are also 6 3-3/8" long chords going up and down that are connected by the 360 degree grooved gusset plates and the 180 degree gusset plates.
Plan:
Here the bridge is still made up of 6 3-3/8" long chords on each side connected by 360 degree grooved gusset plates on each side. The corners are connected by 8 180 degree grooved gusset plates. In between the gusset plates are 2 5" long chords, one resting on top of the 360 degree gusset plates and one connected on the bottom of the 360 degree gusset plate.
Costs:
Changes:
My bridge design kept changing as I designed more of the bridge. I kept adding more chords for support since I think it is easier to take away chords to reduce costs than it is to add chords and increase costs. I feel I have made a sturdy bridge with lots of support, but I feel like I need to find a way to cut costs and make the bridge cheaper to construct.
Learned:
During the design process I learned how to make changes on the fly that logically makes sense. I realized it is ok to make changes and vary from what the original design was. Designing the bridge is a long process that needs to keep changing if I want the bridge to be cheap and successful when it is completed.
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