15 Oct 14: Applications in Use, VII--It adds up
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Some of the most insidious and pervasive cases of over-designed installations are those that are a compounding of safety factors.
It works like this. One person orders a piece of equipment. An engineer then asks the supplier of this equipment what the loading is on each anchor pad. The equipment supplier, not wanting to get into trouble, makes a rough calculation, doubles it, and sends it to the engineer. The engineer takes a look at it, and not wanting to have a problem, doubles it again. If this happened to be a structure in the air, it might then be sent to a foundation designer, who, you guessed it, doubles it again.
The result is a waste of concrete and steel beyond all reasonable safety factors.
If you have overall responsibility for a project, challenge these matters--require each entity in the process to show you the calculations that they used to derive the numbers they pass down the line. You will save serious money.
with "LGMI Frontiers" in the subject line.
LGMI DESIGN PRACTICES ARE NOW AVAILABLE!
As always, your comments will be appreciated.
Brian Brogdon, Ph.D.
Send us your comments by emailing Brian Brogdon
or Jim Thompson!