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Re: WOOD MOMENT FRAMES, Rw = 3[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Re: WOOD MOMENT FRAMES, Rw = 3
- From: Parkerres <Parkerres(--nospam--at)aol.com>
- Date: Mon, 13 Apr 1998 16:35:57 EDT
In Chapter 16 of the 1997 UBC (also in the 1996 Supplement), a line has been added to Table 16-N, requiring Rw=3 for "Cantilevered Column Systems". We now follow this guideline if we are designing cantilvered columns with either a grade beam or pole foundation, such as at a garage door. I think this was invoked to help prevent Northridge Meadows type soft-story collapses. It creates rather large columns, especially because you still have to satisfy the 0.005H drift requirement. The real question we have in the office, is whether or not the Rw=3 now applies to the entire building since you are using it for one shear line in one direction. As to "wood moment frames", I think this optimistic to say the least. Either use the cantilivered steel columns, or add a steel beam and make a steel-to- steel moment connection. Bruce Resnick, SE Parker Resnick Str. Eng.
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