×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Lateral Wind Design for C-shape structures (such as a garage)

Lateral Wind Design for C-shape structures (such as a garage)

Lateral Wind Design for C-shape structures (such as a garage)

(OP)
This comes up a lot in residential design...Considering lateral wind loading, when looking at a garage (or open structure) where there are little to no framed walls on either side of the door/opening, my go to has always been to add a steel moment frame to take the wind loads coming from the adjacent side walls. A fellow engineer I talk to sometimes mentioned there are methods to design a "C-shaped" structure for lateral loads, but he didn't have any information available, nor can I find anything in IBC or ASCE about it. Does anyone have any resources to evaluate this type of structure for wind loading? I would love to help my clients avoid the cost of a steel frame whenever possible, but obviously want to do that in a responsible manner. Thanks in advance.

RE: Lateral Wind Design for C-shape structures (such as a garage)

Try searching 3-sided diaphragm design.

Good references for this are Malone, and NDS SDPWS. Not a big fan of this approach is seismic areas and for multi story. But they are used fairly often, and have their place.

RE: Lateral Wind Design for C-shape structures (such as a garage)

@Joe O

You run into this issue also with commercial storefronts in which the front wall provides little to no resistance so often neglected. Personally I'd avoid the moment frame unless you can get a 3-sided diaphragm to work. Here is a design example for some:

https://www.woodworks.org/wp-content/uploads/desig...

Given the fact that this is a garage, you'll want to make sure you can get the load from your roof into the shear walls with the blocking.

"Engineers only know about 80% of the truth, the next 10% is very difficult to achieve, and the last 10% impossible. If we are bound to be wrong, we may as well be wrong simply and conservatively."

RE: Lateral Wind Design for C-shape structures (such as a garage)

A moment frame is my preference every time.

RE: Lateral Wind Design for C-shape structures (such as a garage)

Simpson makes a system (Stongwall) specifically for this case. You need a little space (at least 12 inches), but the track needs to go somewhere.

RE: Lateral Wind Design for C-shape structures (such as a garage)

These situations are usually referred to as "open fronted" or "3-sided diaphragm". These can be designed fairly easily using a torsional approach. ASCE 7-16 and 2015 SDPWS 4.2.5 are all you really need to achieve the design.

RE: Lateral Wind Design for C-shape structures (such as a garage)

A few years back I was involved with a large addition to a small existing building. New framing was CFS for fire rating reasons. There was absolutely no information about the existing building. Lateral load for the new addition was resisted by a rigid frame on the end and CFS and X-bracing on the side walls. I analysed the forces using a lateral load spreadsheet, written decades back. I then use the forces to design the rigid frame. The rigid frame was used because there was a stip of windows in the end wall that prevented the use of X-bracing.

I generally use X-bracing because of stiffness.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close