×
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

Steel moment frame for wind resistance in custom home

Steel moment frame for wind resistance in custom home

Steel moment frame for wind resistance in custom home

(OP)
What experience have you had specifying Simpson Strong-Tie Special Moment Frames?

I assist a number of custom home builders, architects, and residential designers here in the upper Midwest (Seismic Category A, 115 mph wind). I'm in a large metro area with a building/plan review department that is very thorough. Many of these homes have tall wall foyers and/or great rooms, balloon-framed with LSL studs, up to 20ft tall in some cases. These tall walls exceed the prescriptive wall bracing methods allowed in the IRC. Sometimes the truss/lumber supplier will engineer the LSL stud framing, connections, etc., but not the overall wall bracing design. I am usually able to evaluate those exterior wall segments as engineered shear walls and make something work from SPDWS Table 4.3A, and some tension holdowns.

Attached is a sketch of my latest assignment where I don't see a solution with wood framing, I think a steel frame is required. The 14ft tall great room projects outward from the other exterior walls, with just ~16" wall segments at the corners. Often times I will consider the lateral wind loads to transfer thru to other wall segments, but those walls are only 10ft, and the mean roof height here is significant.

I downloaded/installed the Simpson Strong Frame Selector software, and after tinkering, I quickly found a one-story SMF assembly that will work here...much easier than if I designed it with hand calcs, yuck! The program provides a detailed report for permit submittal, etc. I am curious what experience other engineers have had with these frame products, especially with residential masons and carpenters who probably want nothing to do with steel. Obviously the anchor embedment into the foundation walls for these moment frames is critical and in my experience there typically isn't that level of coordination between trades in residential construction. On multiple occasions I have sized a tension holdown and anchor rod that does not get cast in the foundation wall pour. These custom homes keep getting bigger with more windows. Does it seem outrageous for a situation like this to require a moment frame to resist wind loads?

Any input is appreciated.

-Troy

RE: Steel moment frame for wind resistance in custom home

If you call Simpson, they will design the whole thing for you and give you an engineered design to include with your plans. The only details you would need to include in your deign are any connections that don't conform to Simpson standard details from their shop drawings.

RE: Steel moment frame for wind resistance in custom home

Yeah. I would phone up Simpson and get them into the game a bit. I had a lunch & learn with a rep recently and they are pushing themselves as a "structural solutions" company now (not just the wood connectors). The rep seemed pretty open to providing design if their product was used. Now...I don't know what that entails, but it seems to be one way to at least cut your design time out and have a pretty clean solution on hand.

RE: Steel moment frame for wind resistance in custom home

You might not want to hear this, but the better solution is probably a two story frame that goes all the way down to the foundation. Not sure what the Simpson guys will say to that.

There's also "HardyFrame". Though I'm not sure if either Hardy or Simpson do two story frames.

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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