×
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

need design example for basement wall

need design example for basement wall

need design example for basement wall

(OP)
I need an example design of a basement wall with lateral earth pressure and eccentric vertical loads. Can anybody point me to one?

RE: need design example for basement wall

I can't point you to an example but wouldn't you just add the bending produced by the eccentric vertical load to the bending produced by the lateral load for the wall design?

The affects of the eccentric vertical load would also have to be included in the footing design, soil pressure, overturning moment and safety factors.

I hope this helps!

RE: need design example for basement wall

(OP)
Thanks jike and sliderule. This is a continuing situation with an existing building that has horizontal cracks in every basement wall. Core samples show rebar on wrong side of wall. The contractor's hired gun says my calcs are wrong, the rebar may be on the wrong side but the wall has sufficient strength. Says the vertical compressive load counteracts flexural tension in the rebar. I thought an interaction diagram would show the wall on the wrong side of the curve. Just wanted a foolproof design example to put in front of them.

RE: need design example for basement wall

Is his hired gun a structural engineer? It should fairly easy to prove him wrong. If this is a one story building with a basement, I would have a hard time believing that the vertical stress would even come close to the flexural stress in the wall.

You may need to first look at this wall to see if can act as an unreinforced concrete wall.

RE: need design example for basement wall

An eccentrically loaded wall can provide some resistance against lateral soil pressure... how much, depends on the load and if the soil doesn't provide sufficient resistance, you have the same problem but on the other side of the wall.

You have to be careful in trying to determine the flexural resistance of plain concrete... some codes deal with this, but you may be surprised how much resistance a plain 8" conc wall can provide.

The fact that the wall has cracked horizontally is indicative of flexural loading that has failed the concrete.  The crack should be just below mid height of the wall.  Cracking can also be a result of heavy equipment travelling too close to the wall; this will cause an increase in the lateral pressure.

Remediation is often a matter of providing HSS vertical sections that act as beams and allow the 'plain' concrete wall to span horizontally...

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!


Resources