Weak Axis Bending of Channels
Weak Axis Bending of Channels
(OP)
What is the allowable weak axis bending stress for channels. Thanks
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Weak Axis Bending of Channels
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RE: Weak Axis Bending of Channels
RE: Weak Axis Bending of Channels
RE: Weak Axis Bending of Channels
RE: Weak Axis Bending of Channels
According to the current 2005 AISC Spec, the allowable strength is FyZ/1.67, where 1.67 is the safety factor and Z is the minor axis plastic section modulus. This has to be less than 1.6FyS where S is the weak axis section modulus. According to the AISC BAsic Design Value Cards, the weak axis allowable strength for channels can be taken as .9FyS, where S is the weak axis section modulus. The design cards use equations that have been simplified from the Spec.
If you are using the 9th Edition AISC (green book), it's not explicitly given. Logiacally, you would expect at least the same allowable stress assuming a compact section because you won't have lateral torsional buckling. However, if you read section F2, the text says that 0.75Fy only applies for doubly symetrical I and H shapes. It was the practice of my office when we used the green book to only use .6Fy as the allowable stress for weak axis bending of channels. This is very conservative, but we didn't feel that the spec supported a higher value, although from a technical standpoint we knew it was much higher.
RE: Weak Axis Bending of Channels
tg
RE: Weak Axis Bending of Channels
The ASD 9th edition does not address minor axis channel bending. I have to disagree with the reference to section F2 since that section deals with weak-axis bending of I-shapes and bars and plates, not channels.
RE: Weak Axis Bending of Channels
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RE: Weak Axis Bending of Channels
RE: Weak Axis Bending of Channels
Please state the geographical location, so I can run the other way... :)
Channels give me the creeps, whenever used in a non-traditional way (read: Hyatt Regency, although that was a completely different application)
tg