Storefront beam design
Storefront beam design
(OP)
I am new to commercial building design and have a quick (but several :) )questions on how you design the storefront beams.
Say my building is one story 20 ft tall (roof diaphragm at 20 ft.) and storefront at 10 ft level. I have series of HSS columns available every 22 ft.
What is the design consideration for my storefront beam? Is it the out of plane wind? It would be on the weaker axis too, so what is the general practice, use rotated (90 degree) C or I sections?
If I am correct about the beam, then would you again design your column for out of plane point load reaction at 10 ft.?
Also, what deflection criteria would you use? Since the fronts would be glass I feel like my beam should be very resistant to deflection.
Any help would be truly appreciated. Also if somebody has a reference design example or something, please upload it.
Thanks,
K
Say my building is one story 20 ft tall (roof diaphragm at 20 ft.) and storefront at 10 ft level. I have series of HSS columns available every 22 ft.
What is the design consideration for my storefront beam? Is it the out of plane wind? It would be on the weaker axis too, so what is the general practice, use rotated (90 degree) C or I sections?
If I am correct about the beam, then would you again design your column for out of plane point load reaction at 10 ft.?
Also, what deflection criteria would you use? Since the fronts would be glass I feel like my beam should be very resistant to deflection.
Any help would be truly appreciated. Also if somebody has a reference design example or something, please upload it.
Thanks,
K






RE: Storefront beam design
7x7 and 8x8 columns mostly.
RE: Storefront beam design
Thanks.
What were the beams like?
and you provided cross bracing for in-plane load right? I have enough solid walls to take care of in-plane wind so I wont need the xbrace.
RE: Storefront beam design
As you've suggested, your beams and columns will both be wind resisting members. Glazing systems are usually able to tolerate a fair bit of movement at the top.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Storefront beam design
RE: Storefront beam design
Yes, might do that or may be a rectangular HSS.
@kootk
What is a fair bit? Can I design based on L/360 deflection?
I have a 2'6" parapet above the roof level. I guess I will have to design a wind beam at that level too.
RE: Storefront beam design
The steel stud guys then come in and fill in the gaps.
I've been told to attempt to design for 3/4" max vertical deflection for curtain walls. In terms of out of plane I don't think I've ever seen a real tolerance besides L/360 for brittle finishes. The glass windows and doors never seem to care about out of plane deflection.
RE: Storefront beam design
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Storefront beam design
Thanks guys.
RE: Storefront beam design
DaveAtkins
RE: Storefront beam design
I am designing for out of plane load (wind), meaning my deflections are horizontal. Do you take horizontal deflection differently?
Thanks.
RE: Storefront beam design
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.