Bridge Final Project Emiliano Valencia-Donohue, Spencer Linton, Jason McGee

The ideas behind our first bridge was to use the truss system and adapt it for a practical usage in popsicle stick bridge. Which we did through a process of simplification and reinforcing parts of metal bridges to fit popsicle sticks. We built trusses along the sides to do disperse tension and compression throughout the whole bridge and make sure that there is not too much weight forced on to one area of the bridge. We built the top and bottom using a modified version of the standard bridge top that made a standard x shape to look more like an n. This caused the distribution and receiving of weight went in a consistent movement and didn't double back on itself, which would have caused it to collapse.

Our bridge was designed to be simple and effective, our bridge had two major flaws that caused it to collapse. The first was that our sides were not symmetrical, they were further spread apart and of different heights on the different sides of the bridge. Second was that because we focused on modification we did not fix the changes we made. Some points were not thick, while others did not work as effectively as we thought or they were not secure enough to be effective.

A side view of our first bridge
How our first bridge broke

For our second bridge we knew we had to make it stronger than the first. We decided to make the four beams running along the side of bridge 2 thicker so they would be able to hold more weight. We also knew our last bridge was not very symmetrical, the beams were spread further apart on one side than on the other. We decided to be more carful when built the second.

While building our bridges we learned that the best way to build a bridge was to use triangles because they are a very sturdy and an effective way to make your bridge strong and to have the thin side of popsicle sticks facing the ground because the stick is stronger and can hold more weight that way

The bridge broke because of all the pressure the weights were putting on it. It was built to be lightweight and thin however this ultimately made the bridge cave in on itself and break off into little shards and pieces.

Our second bridge was much more even

We learnt that the most important thing you need when making a bridge is patience. You have to be very careful, because the more even the bridge is, the stronger it will be, and it will be much more steady. Although we were on a deadline, we were much more careful on our second bridge.

On the left, is our first bridge, and as you can tell it is very uneven on both sides. We learnt from our mistakes, and took more time on our second bridge (right picture). On both bridges we used the popsicle sticks harder side, which is highlighted in red in both pictures. Combining this with the trusses which fit perfectly in the spaces of the sides (in blue), it made both our bridges very sturdy. The last part of our bridges that made them hold 126 and 151 lbs. respectively was to use glue to our advantage. Highlighted in green, are the places where we overglued. Keeping in mind that we could only glue 50% or less of a stick, we just put on multiple layers of glue on the connections of the sticks

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