×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

R factor for steel rod x-bracing with wood framing

R factor for steel rod x-bracing with wood framing

R factor for steel rod x-bracing with wood framing

(OP)
I have a single story wood framed project in SDC D on a sloped lot. Instead of using wood cripple walls and a crawl space, they want to leave it open and use x-bracing with rods, turnbuckles, etc. The main story above would be wood sheathed shear walls. They would like the beams and posts below the main story to remain wood if possible and hook the rods to some custom brackets at the top/bottom of the columns (or something like that - the exact design is still in the works).

In looking at ASCE 7-10 Seismic Systems (Table 12.2-1), none of them fit perfectly. Do you think it is reasonable to consider this a steel ordinary concentrically braced frame? (R=3.25)

RE: R factor for steel rod x-bracing with wood framing

I would be tented to relay on which member yields/fail first. Avoid failures at connections, imagine increasing loads until failure of wood or yielding of steel if you have a wide margin between both capacities choose that material R factor. But if you choose the less conservative R factor take into account that not all the structure will respond with the same overstrength capacity.

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!


Resources