PT1.3 - Construction of Bridge

Design rationale

General design
The bridge uses an under arch design, which is one of the most efficient and stable model types. This arch design allows the bridge to effectively distribute the weight of the truck over many members at once, allowing use of much less material and allowing the bridge to obtain optimal efficiency.

Members of the bridge
We attached the members of the bridge with a ‘criss cross design’, allowing it to function with the same amount of strength as a solid bridge but be almost twice as light. All of the structures in the bridge uses this method, which then allows it become much lighter but also carry the same amount of weight.

Base of the bridge
The base of the bridge contains is an ‘Under-arch’. The under-arch is connected to the bridge via 6 main joints, the side joints, support joints and the middle joints. However, instead of directly copying the bridge design from WPBD, we modified it such that more trusses were added to the parts where are under more stress such as the middle where the bar is held and the sides where it rests on the machine. This allowed us to hold more weight in the set-up and reducing the amount of redundant weight created by the additional trusses. The members are also position in such a way so as to allow the under-arch to absorb almost all of the force as tension and compression, which allows the bridge to have a very high-efficiency ratio.

Joints of the bridge
The joints of the bridge is reinforced with cut ice-cream sticks. These cut ice-cream sticks allow for more surface area to join the sticks which allows more spread of tension and allow it to stay together stronger. We also joined all our sticks using the ‘criss cross’ method, which also increases surface areas for the glue to work.

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