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Questions & Answers
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Q: If the bridge has some camber - that bows the bridge above the 5 cm mark of the supports, is that a violation since the point of concern is not at the support surface? I have to assume then the center height will be measured from the base of the support structure.
A: Although camber is generally a good idea, no part of the bridge may extend up beyond the 5 mm envelope limit at any point along the length of the bridge.
Q: Can the cables be made of rubber bands?
A: Yes, rubber bands will be acceptable.
Q: Can the part of the bridge that supports the load plate be made of cable material (fishing line, etc.)?
A: Yes.
Q: Can the cables be made of duct tape or masking tape strips?
A: No. Tape (duct tape, masking tape, scotch tape, etc.) will not be allowed.
Q: Obviously the loading plate moves up and down, say along the z-axis, is it also free to rotate about the z-axis? I assume the plate cannot rotate about either the x or y axes. In other words, how many degrees of freedom does the loading plate have?
A: The loading plate will not rotate about any of the axes. I consider it to have only one degree of freedom which would be movement along the "z" (up and down) axis.
Q: Does the loading plane have to be located 5 mm above the support surfaces, as shown in Figure 1, or can the load be supported below the support surfaces?
A: The loading plane can be below where it is shown in the figure, as long as it is not so low that it is below the allowable construction envelope.
For more information, contact:
John J. Migliaccio, P.E.
Project Manager
Structural Engineering
San Engineering LLC
10298 Spotted Owl Place
Highlands Ranch, CO 80129
john@sanengineeringllc.com
Guenther Polok, P.E.
Associated Design Professionals, Inc.
1861 Austin Bluffs Pkwy. Ste 101
Colorado Springs, CO 80920
719.266.5212
gpolok@adpcivil.com
National Society of Professional Engineers - Colorado Chapter
333 South Allison Parkway Suite 204
Lakewood, CO 80226
Phone: 303-480-1160
Fax: 303-979-6094