Balcony rigid diaphragm design
Balcony rigid diaphragm design
(OP)
I am designing a rectangular balcony structure( see attached pdf plan), that is attached to the existing house on one side and is supported with two 6x6 wood columns on the far side. Can the rigid horizontal diaphragm be designed so knee braces are not required for the far end latteral support?
Thanks.
Thanks.






RE: Balcony rigid diaphragm design
RE: Balcony rigid diaphragm design
The only extra thing needed is to tie the two corners of the deck that are next to the house back to the floor structure/diaphragm of the house with metal straps.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Balcony rigid diaphragm design
I think on the East side an MST36 will be easy to install.
On the right side I may use a different tie with a bolt.
RE: Balcony rigid diaphragm design
Not knowing the exact framing, there may be other alternatives, but just a bolt into a ledger situation is not goint to accomplish what you need to do. Your tension/compression forces could be a kip or so.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Balcony rigid diaphragm design
Cs=0.274
V=0.274*4155=1139LBS
Mov=V*L/2=1139*12/2=6834ft-lb
T/C=6834/18=398LBS
Simpson's LLT19 LA RR25818
allowable load is 825*0.75=618.75LBS
If this is correct, do you think I can use LLT19 with 1/2" bolt through existing 4x12 or 2-2x12 2nd floor framing?
Thank you very much!
RE: Balcony rigid diaphragm design
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask