The contest is to build a model bridge in accordance with the contest
rules which will hold the largest load in relation to its own
1. Bridge span = 36 inches between supports
2. Maximum allowable dimensions
Length = 42.0 inches
Width = 7.0 inches
Height = 12.0 inches
3. Maximum bridge weight = 3.00 pounds (1362.2g)
4. Bridge must have a road way with atleast 4 inches of horizontal
clearance to allow for loading.
5. The bridge must be a self contained unit. No anchors will
be provided for
suspension bridges. The edge of the tables may be used
horizontal supports for arch bridges.
6. Commercial grade cardboard may not be used as primary
Only the following materials may be used in construction.
1. Soda straws, either paper or plastic
2. Plain-sheet cardboard or paper (maximum thickness = 1/16 inch)
(No cardboard tubes)
3. Corrugated cardboard (maximu thickness = 3/16 inch)
4. String, thread, or cloth cord (no wire or fishing line)
5. Toothpicks, matchsticks, popsicle sticks, tongue depressors
6. White glue, wood glue, hot glue (No epoxy cements)
Students may work in teams of two people. Each person in a team will
receive 80% of the points the bridge earns.
The testing device needs the 4" x 4" opening to pull down on the
bridge. If you excede any of the above bridge dimensions, then your
device cannot be tested and you will receive the minimum points.
BRIDGE BUILDING CONTEST RULES BOOKLET
The testing device is a see-saw. In order for the 450 pounds to be
balanced by 90 pounds a water, it side of the see-saw must be 5 times
longer. Every pound of water poured out of bucket causes the clamp to
pull down on the bridge with 5 pounds of force.
There are basically 2 ways to design you bridge for testing.
BRIDGE SHAPE SUMMARY
Go to the Contest Home Page