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Component Manufacturing dverti$er
Don’t Forget! You Saw it in the
Adverti$er
December 2018 #10233 Page #33
How Important is Angulation? Why is It Important?
P
er ANSI/TPI 1–2014, National Design Standard for Metal Plate Connected Wood Truss Construction, plates should be installed within a 10 degree tolerance. So what happens when the plate is rotated and exceeds this requirement?
The simple answer is: the configuration and design of the connector plate provides different values depending on the orientation of the teeth. For example, the plate in the photo which has elongated teeth will have a higher cross section value, and therefore strength, in one direction than in the other direction. Teeth have a stronger resistance to withdrawal based on their configuration. This results in differing values based on the angle. As the plate is rotated, this value will change. The 10% rule is a limit to serve as a guideline for using the values generated on the shop drawing. The tolerances can be adjusted, but that requires specific design changes. Using a plate monitor, a designer can rotate a plate to any angle and analyze the impact. But remember, this manipulation would need to be communicated to the shop so they would know the new angle orientation and build accordingly.
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