Single Angle Columns
Single Angle Columns
(OP)
I am using Enercalc to check the capacity of a single angle
to be used at a lightly loaded column.
After selecting the proper angle Enercalc immediatly replies with "Single Angle not Allowed"
If the minmum KL/r = 200 is met and you can get the capacity Fa, I do not see why a single angle cannot be used as a lightly loaded column. Is there an AISC ASD provision that prohibits the use of Single Angles to be used as a lightly loaded column or is Enercalc not correct?
Thanks,
Jeff
to be used at a lightly loaded column.
After selecting the proper angle Enercalc immediatly replies with "Single Angle not Allowed"
If the minmum KL/r = 200 is met and you can get the capacity Fa, I do not see why a single angle cannot be used as a lightly loaded column. Is there an AISC ASD provision that prohibits the use of Single Angles to be used as a lightly loaded column or is Enercalc not correct?
Thanks,
Jeff





RE: Single Angle Columns
RE: Single Angle Columns
RE: Single Angle Columns
h
RE: Single Angle Columns
Here's another discussion with info on single angle columns that might be useful. My guess is that your program doesn’t get into the complexities of single angle struts.
thread507-131758
In short, the problem is that an angles major and minor axis are not the x and y axes. An axial load that is not thru the cg (and most of the time they aren't) will cause bending that needs to be transformed to the z and w-axes. This is tedious process considering the relatively complicated allowable stress formulas. In addition to the section in the ASD that aggman suggests you should also check out pages 3-55 thru 58 for two examples.
It was mentioned in the other thread that the new combined spec has changed concerning single angles. I'm not sure exactly how at this point, so if you are interested check it out.
www.aisc.org/2005spec.
Regards,
-Mike
RE: Single Angle Columns
Oops.
Just a momentary lapse of reason.
-Mike
RE: Single Angle Columns
14159
RE: Single Angle Columns
RE: Single Angle Columns
Has anyone noticed whether the old ASD is still acceptable in the new IBC 2006?
I'm just trying to hang on a little longer.
Regards,
-Mike
RE: Single Angle Columns
RE: Single Angle Columns
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