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OMF seismic category D

OMF seismic category D

OMF seismic category D

I think I posted this is the wrong place so I am asking it here as well.

I have a few questions for a Steel frame canopy which is over equipment, etc. It is less than 35 feet high (14' high). I can use braced frames on the side and back but I need it open on the front. Therefore, I was going to use a OMF with pinned bases along the open side. It will be attached to an existing concrete wall at the base so I want the loads light for the foundation. First, am I reading this correctly and this is allowed in seismic category D. I would use an R=3.25 (braced frame controls) And if it is allowed, can I consider a w beam with a cap plate over a HSS connection as a OMF connection allowed in this situation? It also has high a wind load and a high snow load and it about 10' by 71'. I don't want to use cantilever columns because of attaching to the existing concrete.

Thanks for your help!

RE: OMF seismic category D

See this thread. Link

RE: OMF seismic category D

Okay, so for any R value in seismic D you need to use the seismic AISC 341 for the connection if I am understanding correctly. What I haven't found are situations where the cap plate (Continuous W beam over HSS column) design will work for the high seismic area. I know it has been used here but I can't seem to find where is says that it is okay to do so. Does anyone know where I could find that or if I need to design as a cantilever column and then use that connection. Or if there is a "really cheap" OMF moment connection that is allowed for high seismic. I just don't know what is in the concrete wall or the footing for it. It is about 6' high and 1' wide so I can assume what the reinforcing may be but I would rather have it as pinned if at all possible. Any suggestions?

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