×
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

Wall Anchorage Force

Wall Anchorage Force

Wall Anchorage Force

(OP)
I'm designing the anchorage for a masonry bearing wall per ASCE 7-05, section 12.11.2. It is low seismic so the 280 plf requirement controls. The anchorage components are wood (2x braces from the top of the wall up to the first truss). I interpret the code as saying that 280 plf is a force (Fp). E = rho*Qe where Qe is the effect of seismic forces from V or Fp. Thus, my 280 plf force is E.

So for wood design using ASD, I can multiply this force by 0.7 to get it to service level, then use the Simpson table values for 160 load duration (wind/seismic).

Anyone see any flaws with this reasoning?

RE: Wall Anchorage Force

Yes, E is an LRFD force, so you can multiply by 0.7 (which results in 196 plf, approximately equal to the old UBC required force, 200 plf).

And yes, with wood you are allowed a 60% increase for load duration. No other material (concrete, masonry, or steel) allows any kind of increase; this is unique to wood.

DaveAtkins

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