My take on UL, for rated walls, wind uplift, is that the documented assembly is only good for the UL rating as assembled. What I am trying to get my client to understand is that UL can't be "extrapolated" and that there are other third party testing labs out there who can perform the test for...
Thanks
I've looked at FM-28 for other projects. It looks like UL has responded to industry demands and only run tests for 90 psf. I did a quick calculation for a "typical" building this morning and found that for 100 mph, exposure C the highest pressure in the corners is about 90 psf.
Looks like a flitch beam may be the best and easiest way to go. I would follow the profile of the two ridges, begin at the post between the windows on the left, up the first slope, overlap the lower flitch beam with the one at the high ridge and come back down along the roof slope to the...
I've been using "CFS" by RSG Software for a while. It's reasonably priced and has some good output options for things like buckling modes, etc. SteelSmart is pretty good also.
UL wind uplift ratings for roof assemblies only go up to 105 psf. What do we do if we have wind loads in corner and edge zones in excess of this? It is not unusual to have wind uplift values in the 120 to 150 psf range.
How many have encountered this foolishness? A university near my office is offering a CEU class in "Socially Responsible Engineering." Topics include environmental risk and justice, engineering response to terrorism, green engineering, life cycle assessment. One at a time:
1. environmental risk...
beel76
Start getting clients lined up get to work NOW. You need invoices outstanding before you get the axe. It sounds like you might be working for a bunch of shortsighted guys anyway so who cares? Go out and kick their ass. When I started I did my design work during the day and my CAD work at...
I have found that keeping a diverse clientele has helped a lot. Diverse in the sense that they are associated with different segments of the economy. I have been a three to five person operation since 1991. I remember the Carter years and it's not that bad yet. Inflation was 18%, the prime was...
YO zdas04:
Be careful. I think you have to seal and sign everything you produce. Check your states regs. The fact is we live in an era where the registration boards are instituting what I consider to be foolish "gothca" type regulations. They must not have much to do. I am registered in a bunch...
Use 1/2 of the base material strength when designing welds in aluminum structures. I don't think the electrodes matter that much. What happens is that during the welding process the aluminum looses it's "tempering" and there is a significant change in properties.
Greg Robinson
Simple spans is the way to go. There is a good article in the AISC technical publication about this very thing. It's at my office so I can't give you anything specific. Do a search at the AISC website. The splice may become a fatigue issue so I would certainly check it for that. AISC Manual of...
I'll take a chance on beating the moribund equine.
The essence of professionalism is personal responsibility. As a licensed PE I can get in trouble if there is a problem on a project I have done. If i was negligent in some way, or if the judge wants to "spread the pain" I pay. Even if I am not...
I'm not on my pedestal, maybe a soap box. It's true that we have become over-regulated because the states and the various boards seem to have nothing better to do. If I seal something in FL I have to make sure that specific, state approved text is near my seal stating that my drawings comply...
