PT1.3 - Construction of Bridge

3.1 Design rationale
(WITH PHYSIC CONCEPTS)

Our design had 2 layers of base. The first layer was a criss-cross and the second layer were 60 sticks put together. We used criss cross as they would form triangles which would give a strong and stable base. As there were gaps and it was not uniform, we made a straight base of 68 sticks to fill up the gaps. We also had 5 sets of sticks which were pasted at the top of the base to strengthen the base. The layer of sticks were made with 5 sticks combined and layered together to even out and balance the weight and 5 sticks on top to even out the surface. We pasted 4 at the 2 sides and one in the middle. The middle one was surrounded by 4 sets of triangles so that the middle could be stronger. We also had inserted a few sticks between the triangles so that the triangles could be well stuck together and they are well supported. We used triangles because triangles are the strongest and most stable shape, as compared to any other shape. 
Explain using diagrams, the

·       General design

The design is made with the pathway with supports in order to prevent it to break easily as when the bridge bends while testing connecting it in verticals made it break easily due to the friction that the side of the stick with the glue being low. It is further supported by the joints that helps to connects the bridge, this lower truss makes it stronger, withstanding more weight. Due to the weight only being placed in the center, a lower triangular truss is made to help distribute the tension across a larger area of the lower truss that supports the bridge. 
·       Members of the bridge


The bridge is made up of the base, anchors and joints of the bridge, this makes the bridge to be stronger as the tensions will be able to be contributed to larger areas in specific parts of the bridge.
·       Base of the bridge


The base of the bridge allows 'vehicles' to pass through or even 'people'. This is because the sticks that made up the bridge is glued together, which increases the friction between each other, making it stronger to withstand tensions. The slanted stick support allow the tension to be distributed further.

·       Anchors of the bridge


The anchor of the bridge is made up of triangles connected in twos with a stick in between at its lowest to help the tension to spread from the left side of the anchor to the right side of the anchor and vice-versa.As the bridge is tested, the tension will be at its highest in the middle, but with the triangular support, the tension of the triangle makes it pushes to the sides, hence allowing more parts of the bridge to withstand the tension before breaking.


·       Joints of bridge

  
The joints of the bridge is made from 5 long strips of wooden sticks made up of the 4 stack of sticks is connected in zig-zags before the 1 stick is placed on top of them which causes the friction in between them to be higher allowing the sticks to not break easily as it interlocks just like how the bricks is designed when constructing buildings/houses.


3.2  Detailed dimensions

Basic measurements
Mass of bridge
489g
Overall length
57.0cm
Overall width
10.7cm
Overall height
13.3cm

3.3 Construction of prototype

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