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SDC D - Is SMF the best option

SDC D - Is SMF the best option

(OP)
I am designing a 3 story storage bldg. in SDC D. At parking area, I have beams spanning 35 ft and are supporting two floors above them. Currently, the route I am taking is to have SMF as my lateral resisting system but it is involving lots of special detailing ( which Im not familiar with) and is too expensive. So I was wondering if there are any other options?

Thank you so much for your help!

RE: SDC D - Is SMF the best option

Can't you use an IMF if it is less than 35 feet in height?

Mike McCann, PE, SE (WA)


RE: SDC D - Is SMF the best option

(OP)
Total bldg height above grade is 46 ft., my moment frame is 18 ft high and is holding two stories above. Only gravity load is around 310 psf, I don't think I can go by IMF.

RE: SDC D - Is SMF the best option

Actually if you look at ASCE 7-10 section 12.2.5.7.1 you can potentially use an IMF depending on your loading. With that said have you considered a masonry or concrete special shear wall? Being such a short structure they both could work and the detailing would be easier (especially for the masonry).

RE: SDC D - Is SMF the best option

I work pretty exclusively in SDC D, and typically do either SMF (with WUF-W connections) or special r/f masonry shear walls.

RE: SDC D - Is SMF the best option

(OP)
Thank you all. We are going to have a dual system w/ special moment frame resisting 25% of the load and steel special concentrically braced frames inside the bldg.

RE: SDC D - Is SMF the best option

If you don't like designing and detailing SMFs, you may end up hating SCBFs. For both, AISC Seismic Design Manual has the best design examples I have seen. Have you considered Buckling Restrained Braced Frames (BRBF)? Often times, they are a cost effective alternative to SCBFs.

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