Model Bridges By BranniCk Hodgdon, Kevin SHeahan, Andres caLderon, Will Macgrath

Bridge #1

Design, Sides, Base, Pros, and Cons

Truss Design (Sides):The sides of this bridge were well made compared to the rest of the bridge. The sides were both not broken after the bottom fell through. We tested the sides alone and alone they held 45 pounds.

Base Design (Bottom): For our first bridge build we wanted our base to be sturdy and layered to be able to hold pressure. We layered the base and ended up not knowing how we were going to connect the sides to it because the edges were to pointy. During the testing we realized that our sides were great but our base went right through the middle. This is because we were relying on the glue to hold everything together.

Pros: The sides of the bridge were very strongly and well made. The triangle trusses were even, sitting and supporting.

Cons: the base of the bridge was connect very poorly, almost not at all. It was attached by bits of popsicle sticks and was designed as a clump of glue.

Outcome: The two different parts of the bridge, the base and the sides both individually held, but our issue was connecting them. The base of the bridge was not securely connected and when the weight was attached the connections popped off. This caused the base and the wight to fall straight through.

Bridge #2

Design, Sides, Base, Pros, and Cons

Pros: the entire bridge was much more sturdy, simpler to build

Cons: lots of materials, used all sticks and glue, the two sides were not connected

Base: For our second bridge, we decided not to create sides and then completely layer up what would be our base. We mostly completed this by crossing all of the sticks so that all the pressure would support itself. This was one of the strongest designs we made and we were very pleased with the outcome of our testings.

Outcome: Our second design held 161 pounds. The bridge could have held more, but the chain that was holding up the weight snapped. One side of the bridge held and the other side did not. The side of the bridge that broke snapped directly on one of the connections.

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