Old Metal Building - Tapered Moment Frame[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Old Metal Building - Tapered Moment Frame
- From: "Alden Manipula" <amanipula(--nospam--at)novagroupinc.net>
- Date: Wed, 28 Mar 2001 09:53:18 -0600
I'm looking at an old metal building (~20 years old, this is a guess) to which new rooftop units need to be placed upon. The building system consists of tapared beams ranging from 24" deep to 31" deep w/ 6" wide flanges (tf = .3" and tw=.25"). 4 bolt stiffened moment connections at midspan (max span = 46'-0") and over the columns and full welds connecting the tapered sections at about 8'-10' from the columns. Z-sections at 4' o.c.
Can I analyze the beam lines as a continous beam w/ supports at the column? Which would mean the largest moments should be at midspan and at the columns. This makes sense to me and confirms the 4 bolt stiffened connections at those locations.
My main question is did they use 33/46/50 ksi steel for these things? I tried looking for a shop stamp on the beams, no luck.
These metal buildings sure are designed to the gnat's ass, aren't they? I'm guessing that these beams will have to be reinforced w/ plates.
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