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RE: Light Gage Steel Design Programs[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: RE: Light Gage Steel Design Programs
- From: Dave Morris <davem(--nospam--at)endex.com>
- Date: Tue, 23 Jun 1998 13:08:51 -0700
We have used both the Pohill program and Prop86 by SureTie. - Pohill was much less expensive. I think Prop86 was $495 and Pohill was around $195 my apologies if these prices are not current. - In the Pohill program you see the AISI formulas displayed with every run. This is helpful if you are new to the AISI code. Prop86 takes your input and gives you answers. The formulas and calculations can be viewed at your option. If you have a good understanding of the code the programs where you put the right information in and get results out is a lot more usable. - The Pohill program comes with the data base of light gage steel shapes including MSMA shapes and Dietrich. The Prop86 people charge for the shape data bases (I think it was $95 per manufacturer). I found this so annoying that I had one of our drafters build the data bases we needed by hand when she had breaks in drafing here and there. It was probably a break even proposition but I felt better. - I found the Pohill program clumsy for doing combined loading, such as studs, where we have an axial load plus a uniform bending load. It required us to go to a joist screen and generate the shears and moments and then return to the axial screen. If you did these in the wrong order the moments and shears return to zero. - I like programs that print out their results on a single page. Prop86 can do this. With the Pohill program the best I could do was three pages - One for section properties, one for combined axial and bending and one for deflections. Prop86 has a single page printout that shows Gross and net properties, allowable loads and deflections. - Prop86 will print out joist and stud tables. This has proved to be very handy. - Once you have your data base set up Prop86 allows you to configure your members into back to back (I columns) or lip to lip (Box Columns). Overall while the Pohill program will do the job we found that Prop86 would do it quicker and gave us more concise reports. ************* All light gage steel design requires you to make assmptions and choices about design procedures. I would like to throw out our default design inputs and see if anyone has comments. Steel Stud Design 1) Deflection Criteria - l/240 2) Design for net section rather than gross section. 3) We design all walls for full mechanical bracing. We do not count on the sheathing for bracing. Our opinion is that many walls are heavily loaded before sheathing is ever installed. Also in a remodel situation sheathing can be removed with no thought given to loss of stability of the wall. 4) All wall bracing is designed for lateral and torsional support so k*l for torsion and k*l for bending are the same. Typical bracing is straps on both side of wall with a short section of track on each end. 5) In calculating kl/x for stud stability in the weak direction we always use k=1. For a stud braced at the mid point or third points possibly a smaller value of k would be justified. 6) We do not use the increase for cold-working. 7) We do not design for eccentricity unless we know that it exists. No accidental eccentricity is imposed.
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