×
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

Column Load on Foundation Wall

Column Load on Foundation Wall

Column Load on Foundation Wall

(OP)
I've designed a residence with (2) center posts and (2) end posts on the end walls. The length of the Girder is 40' with 12.5' end spans.
My question is innoculous enough, the end columns carry 8700# LL & 3100# DL each. With a 18" wide footer on 1500 psi soil that equates to about 5.25 linear feet of footer.
What is the load path down through the foundation, is it a 45 degree angle each side of vertical?
 Oh, and for fun the center posts carry about 30000# total DL+LL each on 4.25 ft sq piers.
Thanks

RE: Column Load on Foundation Wall

Basically, yes, you can assume the load spreads at a 45 degree angle through the foundation or basement wall to the strip footing.  I suppose a more exact analysis would consider the foundation or basement wall to be a grade beam, with a uniform soil pressure pushing up and the column load pushing down.

DaveAtkins

RE: Column Load on Foundation Wall

I'd put in a couple of #5s under the posts, at the bottom of the wall.

RE: Column Load on Foundation Wall

Make sure you check that your loads are concentric on the portion of the footing below that you are using or else design the footing with an eccentric load.  You could just make the footing a little wider like a spread footing at the column location and at the end posts.

RE: Column Load on Foundation Wall

Check ACI Chapter 14 for an equivalent horizontal length of wall under a point load. 4 x the wall thickness + width of your base plate is standard for your case. Good Luck

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