Moment Frame Design
Moment Frame Design
(OP)
When I do structural design for residences I often find that a steel moment frame is necessary in a large window wall.
Normally I talk with the owner to discuss ways of reducing the windows so we can get wood framed shear walls to work or use a manufactured steel shear wall.
However, I would like to know how to design a steel moment frame.
So, I'm looking for a good design guide for full moment conections and moment frame design.
Any suggestions....Anyone?
Thanks for your help!
Normally I talk with the owner to discuss ways of reducing the windows so we can get wood framed shear walls to work or use a manufactured steel shear wall.
However, I would like to know how to design a steel moment frame.
So, I'm looking for a good design guide for full moment conections and moment frame design.
Any suggestions....Anyone?
Thanks for your help!






RE: Moment Frame Design
Any decent steel text book should go through the basics. For more complex w to W shape connections check out AISC design guide 17.
RE: Moment Frame Design
I would design an "Ordinary Moment Frame" and use the Salmon and Johnson textbook as a design guide. There is a website called http://www.engineering-international.com that has a very useful spreadsheet for a simple moment frame. However, it is very, very easy to calculate an OMRF for a simple lateral load. It is possible to design an OMRF without even doing an indeterminate analysis. However, if you have a combination of vertical loads and lateral loads, then you will have to consider more load combinations and the structural analysis gets a little more complicated (probably requiring you to use an analysis program). If you use Ic=Ib, then the analysis gets a lot easier.
I hope I've helped a little.
Regards,
OUe
RE: Moment Frame Design
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RE: Moment Frame Design
RE: Moment Frame Design
With residential structures, normally find that lateral deflection controls the design, seldom stress of anykind. Try to limit the lateral movement to 1/2" or less per story, preferably 1/4" for the windows.
Mike McCann
McCann Engineering
RE: Moment Frame Design
For residential applications, where allowed by the local AHJ, try using the OMF system using the force level calculated by the lower R value (based on the wood shear wall system).
RE: Moment Frame Design
Only appropriate if you have a good reason for the bottom beam to be there.
csd