This may be more rant than anything – I don’t know. I’m curious if any of the rest of you get tired of all the code changes that affect what we do. Particularly the ones that make no sense.
One of the things that bugs me is that they’re now saying that we have to design trusses for wind loads. SIXTEEN different load cases for wind. (In addition to the usual gravity loads)
So what does the wind loading do to the trusses? In the vast majority of cases, virtually nothing. When you print out shop drawings they show a maximum uplift force at each bearing location.
Then they came up with a 10PSF non-concurrent live load for the bottom chord. You run this one with no live (snow) load on the top chord.
One engineer told me the 10 PSF was for things that people might store in the attic. So I asked – Then why only run it WITHOUT the snow load? Don’t people store stuff in their attics during the winter too? I didn’t really get an answer to that one.
Who the hell dreams this stuff up?
BTW – All of the above is for residential construction only. With commercial buildings we don’t have to do the non-concurrent live load on the bottom chord. Instead we have to design them with UNBALANCED loads.
Why design differently for commercial buildings? Does the snow fall differently on them?
Once they start adopting TPI 1-2002 around here, dead loads will have to be adjusted for the roof slope. Like things weren’t complicated enough already?
I sometimes wonder why they keep making truss design more and more complicated, but don’t seem to mess with stick framing at all. Is there anywhere out there where you have to design stick framing for wind loads?
We were just getting software and computers that are fast enough to design a simple truss in a second or less. Now it takes up to 10 seconds to design the same truss, and it comes out virtually the same in the end. That really annoys me.
I don’t like wsting time. And it seems to me that all this is nothing but a gigantic waste.
Sorry for the rant. But I’m curious what the rest of you think about stuff like this…
Do they ever shut up on your planet?