Wind not perpendicular to building projection
Wind not perpendicular to building projection
(OP)
Is there a standard procedure or reference to design shear walls (stud framing) not parallel or perpendicular to the wind direction? All design examples I found use a standard rectangular box.
Thanks for any input
Thanks for any input






RE: Wind not perpendicular to building projection
When wall 2 deflects 10mm then wall 1 will deflect 7mm in plane of wall. Assume wall 1 therefore develops only 7/10 of load in wall 2, which acts parallel to wall 1, i.e, at 45 deg to load direction. Therefore load component in load direction is 50% of design capacity.
ie design capacity of inclined wall = design capacity parallel wall * cos(angle)^2
Does that help?
RE: Wind not perpendicular to building projection
RE: Wind not perpendicular to building projection
Mike McCann
MMC Engineering
RE: Wind not perpendicular to building projection
thanks for your input. Makes perfect sense to me.
Mike, this is exactly wht I did in the past, all Building Departments have accepted it so far. I just felt it might be very conservative. (I am currently working on a residence with large open spaces and few short shear panels, so I probably can not account for loads that are too conservative)
Thank you guys
RE: Wind not perpendicular to building projection
ie design capacity of inclined wall = design capacity parallel wall * cos(angle)^2
a wall at 45 deg is only 50% effective.
RE: Wind not perpendicular to building projection
Questions for all wind experts:
1. Why is 45 degree?
2. If the 45 degree wind glancing through half of the wall, thus creating positive pressure on it, won't the wind then turns direction outward, and creating suction on the remaining wall?
3. When and where we need to consider effects from directional wind force?
RE: Wind not perpendicular to building projection
I have had to check buildings like this myself. e.g.
http://fi
RE: Wind not perpendicular to building projection
Sorry, I wasn't really pointing in your direction, only borrowed the 45 degree (or between 0 & 90 degrees) from you to construct my questions, which are meant to imply the uncertainties involved when deal with natural forces. It looks like the OP is trying to find a valid/proven method (?) to justify the use of lower wind effect on shear walls, or only a few out of the entire building system. I just want to say to that effort - be prudent, especially for lightly constructed residential buildings.
Actually I think you method (your first response) is quite interesting, worth to dig deep into it.
RE: Wind not perpendicular to building projection