I-Joist Truss
I-Joist Truss
(OP)
Is it technically possible to design an i-joist truss? If possible can give me some guide about joint design for i-joist? and axial behaviour?
I would like to design a i-joist truss for a 12m span if posible. But prior to deeply search about it i'll like yours opinion about the reliability of a design like this.
Thanks!
I would like to design a i-joist truss for a 12m span if posible. But prior to deeply search about it i'll like yours opinion about the reliability of a design like this.
Thanks!





RE: I-Joist Truss
There are certainly cheaper and more acceptable ways to build a truss capable of spanning 12m
RE: I-Joist Truss
RE: I-Joist Truss
It's not a roof, perhaps i'm not translating this properly but i refer to that kind of structure, mainly axial pinned elements. I need it to do another work for a couple of weeks. The simple supported i-joist isn't strong enough even if I pray for a support at 6m, also i have the difficulty that it need to be hand installed so i tough i-joist may result in a low enough weight.
I haven't seen any table or document about axial buckling or strengths capacity, neither if it'll be full cross section or effective. At joints maybe i'll could manage to avoid cantilevered fastener by placing a sufficiently rigid attached plywood to the OSB web, (haven't reviewed OSB fastening yet, just steel, ply and concrete).
I'll be pleased if some one let me know about i-joist axial behaviour. I made a regular search about it and found nothing.
Regards,
RE: I-Joist Truss
Every connection would have to have web stiffeners and side plates.
I do not think I joists have ever been analyzed as columns, let alone used as such.
Bad idea... Bad... Bad.
Mike McCann, PE, SE (WA)
RE: I-Joist Truss
I think the same about it, there'll be plenty of things to handle, but i-joist are already used with slopes at roofs, so there should be something about compression performance.
RE: I-Joist Truss
RE: I-Joist Truss
Anyway, yours answers let me clear that there is low reliability about a design like this.
RE: I-Joist Truss
Pretty are that was a limitations many years ago but don't know if they have updated that in recent years.