vierendeel trusses
vierendeel trusses
(OP)
I have a very interesting project coming up that will require the use of VERY LARGE vierendeel trusses. I have looked through my steel texts, and my structural analysis texts, but can't find any information on them. Does anyone know of a good reference for me to read up on this - just to get myself acquainted with this topic?






RE: vierendeel trusses
RE: vierendeel trusses
I will check it out!
Thanks!
RE: vierendeel trusses
Never, but never question engineer's judgement
RE: vierendeel trusses
RE: vierendeel trusses
RE: vierendeel trusses
Note that the deflection of a vierendeel is much higher than a normal truss of similar size and members. First time I did one I was surprised how much more.
csd
RE: vierendeel trusses
RE: vierendeel trusses
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RE: vierendeel trusses
That went over my head. Was that a dig?
RE: vierendeel trusses
Seriously though, the reason that Vierendeel trusses are plagued with so much more deflection is that shear contributes to the deflection to a much greater extent than with "normal" trusses with diagonals.
Mike McCann
McCann Engineering
RE: vierendeel trusses
RE: vierendeel trusses
RE: vierendeel trusses
RE: vierendeel trusses
RE: vierendeel trusses
I've heard it said "veeeer - en - deal"
And I've heard it said "Vie - Ren - De - El"
I like the latter, but I would like to be correct.
"Is there anything thats not covered by blodgett or Roarks!" I don't know about Blodgett, because there's no index at the back of his books.
RE: vierendeel trusses
RE: vierendeel trusses
"there's no index at the back of his books" - that's how he keeps the prices reasonable.
RE: vierendeel trusses
I would be cautious about spending a whole lot of time studing the intricate details of a vierendeel truss at this time.
A lot of architects like to show them in the Concept Design stages becasue they look great. Quite a few get replaced by conventional trusses during the design (or construction) stage after the contractor tells the owner how much the vierendeel will cost.
Have shot myself (and my budget)in the foot a couple of times this way. Have gotten wiser to the game over the years.
RE: vierendeel trusses
Never, but never question engineer's judgement
RE: vierendeel trusses
I have yet to do a building with a braced frame because the architects always want the open spaces and don't want the restrictions of diagonals, so I am certain the vierendeel is here to stay for this project (our typical lateral resisting system is type II with wind connections). In fact, if I understood the 10 minute discussion I had the other day with the project engineer, the complex geometry and large cantilevers is almost dictating its use. I will find out much more in the coming days as I get introduced to the project more. I will update if anyone is interested.
All of that being said, Blodgett has a very limited discussion on this topic. I have also done a search on AISC and have come up with very little. Does anyone know of any other references?
RE: vierendeel trusses
I have some of the plan sheets; it's all full-pen welding at the joints.
Clear span - 220'
Width c/c of trusses - 22'
Height c/c of horizontal chords - 24'
There are bolted splices every 40" horizontal and at the midpoint of each vertical.
All members are A36 steel, built up "I" sections; all flanges are 20" wide.
The horizontal chords have 56" webs; web thickness varies from 5/8" to 1 1/8"; flange thickness varies from 1" to 2".
I couldn't find the web depth of the verticals but on an Elevation View, they're drawn the same size as the horizontals. Web thickness varies from 5/8"; flange thickness varies from 1" to 2 5/8". to 3/4"
RE: vierendeel trusses
RE: vierendeel trusses
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RE: vierendeel trusses
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RE: vierendeel trusses
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