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Instructions for Building Your Bridge
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A. Bridge Contest Summary:
Four awards will be given (1st, 2nd, 3rd, and 4th Place) in each category to the team with the highest score determined from the Bridge Efficiency. Bridge Efficiency is a ratio of how much load the bridge can handle to the mass of the bridge.
Efficiency of your bridge will be determined using the following formula:
The load will be measured in kilograms, while the mass of the bridge will be measured in grams.
Example: If your bridge weighed 22 grams and supported 42 kilograms of weight for 30 seconds during the test, you would calculate efficiency as follows:
One additional award will be given in each category for Bridge Aesthetics.
B. Dimensional Parameters for Bridges:
The bridge must be built within these dimensions (See Dimensional Envelope):
* Bridges may undergo repairs to meet the dimensional specifications. Only the respective team members shall be allowed to make alterations to the structure.
Blueprints or plans of the bridge will be very helpful prior to final construction of the bridge.
C.Wooden Test Platform:
For Category I and II bridges, the load will be applied to this board from below. The hook, illustrated in Diagram 1, must be able to pass below the bed where the load cell will be connected.
For Category III teams, the applied stress will be applied to the board by a dowel rod from above. Again, make sure the dowel can be centered on the bridge deck from above. See Diagram 2.
D. Construction Requirements & Techniques:
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