PT1.1 - Engineering Goals

1.1           Problem statement and specific requirements

Problem Statement
 To achieve the highest efficiency, the bridge must be able to carry a large amount of weight, but be lightweight at the same time. To do that, the design of the bridge should make the maximum use of the strength from the sticks.


Requirements of the Bridge
1. The model bridge may be constructed from standard sized ice-cream sticks only. No other 
material is allowed. The dimensions of the standard sized ice-cream sticks are estimated as follow:

Length: 113 mm Width: 10 mm Thickness 2 mm 

2. The ice-cream sticks may be cut or joined in any fashion. Joining may be done with any commonly 
available adhesive / glue only. No other material, i.e. string, tape, wire, nails etc, is allowed. 

3. The bridge may be stained, painted or coated in any fashion. 

4. The bridge must have a length between 550 mm and 650 mm, a maximum width of 120mm, a 
maximum height of 200 mm and a maximum weight of 500g. There will be penalty for non-
compliance (see Table 5).

5. The load will be applied downward using a loading bar placed across the centre of the deck and 

masses will be supported on a suspended vertical loading rod. (See Figure 1)

6. To simulate a real-life bridge, the model bridge must have a deck for motor vehicles to travel on. 

7. The bridge must be constructed to allow for the loading bar to be placed across the centre of the 

8. Loading will stop once bridge failure occurs. Bridge failure is defined as the inability of the bridge 

to carry additional load with any member of the bridge breaking, or total collapse whichever 

occurs first.

9. The structural efficiency, E, of the bridge will then be calculated. 

 E = Load supported in grams / Mass of bridge in grams

10. All construction and material requirements will be checked prior to testing by the judges. Bridges 

that fail to meet these specifications will be disqualified.

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