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I have just spent the last 3 hours looking at project specifications, SJI and AISC manuals and can NOT find where allowable tolerance for an out of plumb steel joist or steel truss is listed. I know it must be staring me in the face but I can't find it. Anybody out there that can point me to...

I am probably way over my head here but will throw in my $0.02 anyways. I would think that the basic limit would also depend on what sort of machine you are running it on. Machine Epsilon will limit how small of a number the software can deal with. If you divide Machine Epsilon by 2 the...

Any comments on LISA ? 3000 node version is free and unlimited version is very inexpensive; $50 Canadian. Includes a pre/post and looks like it has all the basic feature. Has some nice features like templates for meshing standard presure vessel heads. Oh yeah. I found that old PC...

Thanks folks. Johnhors, As for where have I been since the 80's; Nastran, PAL, SAP (several flavors) FEMAP, STAAD, ... I'm old, I forget the rest. Then of course there was the in house pre/post software that Generous Motors had Structural Modeling Using Graphics AKA: SMUG SMUG and nastran...

... then there could be dynamic response to machine vibration, wind loads or seismic loads. Can you be a bit more specific in terms of the structure and the purpose of the analysis?

I recently quit the "big firm" and now am a sole practitioner. One of the things I still need to pick up is a cheap FEA program. Back in the 80's I had several that ran in Basic but even if I find the discs I probably can't find a 5 1/4 inch drive to put them in. My budget is under $1,000 for...

Like most structural re-use projects the real question is; what is the net value to the projsct? The degree of certainty you can obtain varies with price. (not a new concept, eh?) The degree of certainty that I would require, regardless of the minimum code requirements, would also depend on...

Thanks for the reply John. I recently changed employers and have a copy of Roarks and a couple of other reference books are on order. I will run an FEA but I always like to have something else to provide a GIGO check. This is one of those things that are difficult to do a reality check on.

Sounds like they were lifting a large section of tubular conveyor gallery into place. If they were lifting a 260 foot length of say, 10 foot diameter tube my guess would be that a slight breeze did them in. If it was a 500k lift it may have been that diameter of more. Time will tell. I don't...

Working with an old wood beam suggests that it is already loaded, perhaps overloaded? THe problem with using steel fletch plates or some other composite section is htat you have to deal with the consistent deformation issues. The steel and the wood each take their portion of new load which...

I am a civil/structural but am posting this on the ASME forum hoping it is something covered in the pressure vessel code. I am looking for a reference on calculating local defromation of a thin tube due to wind loads. This is for determining the flatening or ovaling stresses. I have a...