PT1.3 - Construction of Bridge

Construction of bridge

3.1    Design rationale 

Explain using diagrams, the 
  • General design 

We kept to a very simple and light weight design. Instead of a standard K truss, we
used an X truss. Its connect to the base not only with glue like what most groups did,
but instead it interlocks with the gaps we purposely built into the base. This in a way 
pushes the weight sides wards, distributing it. 



  • Members of the bridge
We used an approximately 100 ice creams sticks. We glued them with a gap
between each ice-cream stick. This is to allow the other members of the bridge to 
interlock with each other. So not only does the glue hold them together but the 
ice-cream sticks too.


  • Base of the bridge
The base of the bridge is formed with 4 major sticks which used 12 sticks in total. Only half of each stick is glued to the next stick. This maximises the sticks, making it 
lighter. Further more our sticks are sticked together vertically. This is because the 
formula for pressure (P=F/A) is ver much dependent of the surface area. So we 
thought if we reduced the surface area, the pressure applied will be lesser compared 
if we place them horizontally.

  • Anchors of the bridge 
The anchors of the bridge are made of the 4 main sticks of the base. To fill up the 
gaps between them, we cut sticks to fill it up. With the same principal in mind we 
used to built the base, we placed the sticks vertically.

  • Joints of bridge

The joints of the bridge are “wedge” by 2 ends of an ice cream stick so when it flexes 
it wont “fly” out of place as there is an ice-cream stick preventing it to do so. So this
maximises the maximum strength of the ice-cream stick, eliminating the fear of the
joints snapping due to the glue. 
3.2 Detailed dimensions

Basic measurements 


Mass of bridge
217g
Overall length
620mm
Overall width
40mm
Overall height
100mm

3.3 Construction of prototype

Photograph of prototype

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