The 2005 edition of the NDS for wood says that the span length can be taken as the clear span plus 1/2 of the required bearing length at each end. For wide supports this may help reduce the moment from that calculated to the center of support.
What doesn't appear to be addressed by the NDS is...
There are some good practical responses here already. If you also want to know about the design calcs, find AISC Design Guide 1 at www.aisc.org. It’s free to members.
If you, or someone in your office, aren’t a member you should really consider it if you design with steel. There are at least...
It seems your question is impossible to answer without a lot more information. 1" of deflection in what must be about an 8 ft wall is a big number.
The question is answered with engineering methods though.
What is the reinforcing? What strength does the wall have including Pdelta from the...
I assume you're referring to redistribution of moments in concrete beam design.
It's not acceptable to use this same procedure for wood.
Redistribution of moments for concrete is an issue related to plastic design. At ultimate strength you can reduce the amount of steel for negative bending...
Thanks baw1. You're correct. We use this document as well as several other design guides and text for designing the foundation.
I'm looking for a technical understanding of how the data we use as input, the unbalanced force, is actually determined by manufacturers when they supply it.
I can...
Your correct Greg. At face value there are no consistent units. The factor 1/6000 is not a dimensionless value. It contains all of the missing units to result in an unbalanced force with units in pounds. Rotor weight must be used in pounds.
It's really a simplified version of the second...
How are rotating unbalanced forces calculated by equipment manufacturers? A 10 megawatt generator for example.
We frequesntly design foundations for large rotating equipment. Generators, pumps, compressors etc. A recent example was a smaller 5MW combustion turbine generator set.
We use the...
