Design of Irregular Wood Diaphragms
Design of Irregular Wood Diaphragms
(OP)
I cannot find a decent enough reference that covers my situation with this irregular diaphragm. Here is the layout of the diaphragm with shear walls along A/B and 1/2 (note they aren't full length but we'll ignore that for now):
A B
| |
_____ _1
| |
_ |_ |__
| |___| |
| |
|___________| _2
The loads to the diaphragm are small. I know that if I throw in some perimeter edge nailing (PEN) along the reentrant corners, it'll be fine because the loads are so low. Yet, I do not feel I can justify this design with numbers or accurate analysis. I know there are some assumptions I can make that would produce an overly conservative design but I still want to be able to understand how this diaphragm will perform.
Most of the references I have or found (Breyer Wood, http://so e.uaa.alas ka.edu/soe /courses/c e434/docs/ Lects/Hori zDiap2.ppt) only get into L shapes, Z shapes, and simple openings within a diaphragm.
I have also thought about buying this but I'm not sure if it would help:
htt p://www.at council.or g/Design-o f-Wood-Fra me-Buildin gs-and-Com ponents/Gu idelines-f or-the-Des ign-of-Hor izontal-Wo od-Diaphra gms/flypag e.tpl.html
If you know of a reference or have any suggestions on how to approach this, I would greatly appreciate it.
A B
| |
_____ _1
| |
_ |_ |__
| |___| |
| |
|___________| _2
The loads to the diaphragm are small. I know that if I throw in some perimeter edge nailing (PEN) along the reentrant corners, it'll be fine because the loads are so low. Yet, I do not feel I can justify this design with numbers or accurate analysis. I know there are some assumptions I can make that would produce an overly conservative design but I still want to be able to understand how this diaphragm will perform.
Most of the references I have or found (Breyer Wood, http://so
I have also thought about buying this but I'm not sure if it would help:
htt
If you know of a reference or have any suggestions on how to approach this, I would greatly appreciate it.






RE: Design of Irregular Wood Diaphragms
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Design of Irregular Wood Diaphragms
RE: Design of Irregular Wood Diaphragms
I know how to take care of the cantilever to the right of Grid B: a collector force diagram with the unit shear from each side and the wall shear below. Typical.
The cantilever between A and B is giving me the hardest time. In the transverse direction (vertical on the page), I'm not sure how or where the shear from the cantilever will go: to shear wall A or shear wall B because of the discontinuity at that opening?
Also, once I get that figured out, I'm having trouble determining where my chord forces will end up: at the opening where the diaphragm has a small cross section or all the way up to grid 1 or somewhere near the opening?
RE: Design of Irregular Wood Diaphragms
As for the cantilever to the right of Grid B, there is a size limit by code as to the area you can cantilever. You may need to add a steel frame at what would be grid "C", which is unmarked.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask