Rules

2016 RULES (REVISED FROM 2015)

As promised at last year’s competition a new loading rig is under development. 

  • Bridges must span a minimum of 24” between supports.
  • Bridge ends may NOT be braced by test rig vertical legs. See the revised test frame drawing for dimension restrictions at the test rig vertical legs.
  • The “eat your own bridge” policy will be enforced! Reasonable portions of your bridge will be chosen for you to consume.
  • Structure will consist exclusively of gingerbread and/or graham cracker panels, and edible candy for tension cables and/or connections only. (Meaning, in a structural context:  All steel/concrete members can only be gingerbread panels.  Cable/tension members may be candy.  Bolts/welds/connections of main members may be icing or candy) No precast elements.
  • Candy decorations may be added, but may not be load bearing or structural (cables and connections exempt).
  • No individual gingerbread/graham cracker member (panel) may exceed the dimension of 8” x 4” x ¾” (cables exempt) Keep in mind your material may expand during baking processes.
  • Bridges may not be solid (one member) in cross-section. They may be multiple ply adhered members so long as they comply with maximum panel dimensions.
  • The bridge’s deck must accommodate the loading mechanism (see pictures & drawings below for dimensions), and it must be horizontal across the 24” span. You are solely responsible for ensuring the compatibility of your bridge with the loading mechanism.
  • No bridge may exceed 12” tall or 6” in width.
  • The bridge must fit within the test rig as shown.
  • The bridge will have to support the test jack prior to testing.
  • The bridge may have removable “aesthetics” that will not be part of the bridge structure to be tested.
  • Bridges failing before loading has begun will receive a Failure Load of 0 lbs.
  • Max size of architectural display is 36” deep x 48” long.
  • All display components must be edible with the exception of 36” x 48’ display board.
  • If you have any concerns about your bridge’s compatibility with either the rules or loading device, please do not hesitate to ask!

Loading procedure:

  • Bridge contestants will place their bridge in the loading device with review by Test Monitors. Plastic bags of flour will be available to aid in supporting the bridge evenly over the bearing area.
  • All bridge must be able to support a 3.5” x 3.5” square load applicator. Structural or non-structural portions of the bridge that cannot accommodate the test apparatus loading mechanism may suffer damage prior to loading being applied.
  • The Bridge Weight will be determined by weighing it on the same scale used to determine loading amounts in the test frame.
  • A Bridge contestant from the team whose bridge is being tested will apply the load to the bridge until failure.
  • Anything that is placed upon the test apparatus for bracing, shimming, etc. required to test the bridge entry must be edible and will be added to the weight of the tested bridge when determining the weight-to-strength ratio. The leveling pads provided at the event are part of the test rig and will not be added to the weight of the bridge. Nothing can be added to the test apparatus that would decrease the clear span of 24.
  • If the bridge capacity exceeds the loading ability of the test rig, its rating will be based upon its maximum test load as measured divided by its weight.

 

Test Apparatus – PDF – UNDER DEVELOPMENT

LOADING MECHANISM – UNDER DEVELOPMENT

Test Aparatus 2014 141007

 

LOADING MECHANISM WEIGHTS:

Jack & attached OSB = 9.9lbs
Scale = 7.7lbs
Blocks:
12″ = 2.2lbs
9″ = 1.7lbs
6″ = 1.0lbs
3″ = 0.5lbs