PT1.3 - Construction of Bridge

3.1       Design rationale

Explain using diagrams, the
·       General design

Our bridge is built in way a bit similar to the truss bridge as shown below. Our bridge will have more supports  than in the diagram to allow for the length of the bridge. This arrangement allows the stress from the load to be evenly distributed across the bridge so it can hold more weight.





·       Members of the bridge

The members are arranged in triangles as the triangles is the strongest shape with the least materials. This is good as our bridge is judge by its efficiency so we need it light yet strong.



·       Base of the bridge

We need the bridge to be able to carry vehicles so we need a deck. We made the desk with one layer of popsicles sticks as we designed the bridge that the stress will be held up the main rods at the side of the bridge. We design the base to be able to hold itself up and we used it to start building up the bridge.





·       Anchors of the bridge

The anchor of our bridge are the two ends of the main rods that holds up the bridge. We designed the anchors to bend but now break when force is applied




·       Joints of bridge

The popsicle sticks in the main rods are joined so that most of the popsicle stick is contacting another popsicle stick to ensure that the join is strong. For the triangles at the side of the bridge, the popsicle sticks are joined not in top of each other but directly on the main rods and the supporting rods on the top of the bridge to ensure the largest surface area for the glue to stick to the popsicle sticks





3.2       Detailed dimensions

Basic measurements
Mass of bridge

263.71g
Overall length
57cm
Overall width
12cm
Overall height
11cm

3.3       Construction of prototype

Photograph of prototype




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