×
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

single footing, biaxial bending,soil tension! Adjust pressure?
2

single footing, biaxial bending,soil tension! Adjust pressure?

single footing, biaxial bending,soil tension! Adjust pressure?

(OP)
Pals

Occassionally I have footings with double bending and tension on some corners.

I usually model these using stiff springs and get rid of springs that have tension in them.

I usually end up with some area in compression, which I keep at about 75% of total area minimum(on fear of overturning)

Is there any manual method or any useful software that iteratively makes the foundation compression only?

respects

ijr

RE: single footing, biaxial bending,soil tension! Adjust pressure?

Change the stiffness of the springs in the primary contact area to accommodate increases in soil displacement (elastic compression)due to higher loading in the center of the footing.  This should bring the corner conditions closer to compression.

Keep in mind that you might actually have a condition where you lose contact due to bending.  Primarily occurs when there is a high moment on the footing.

RE: single footing, biaxial bending,soil tension! Adjust pressure?

I think several commercial structural programs such as STAAD, RISA are now capable of handling this situation by using the commend - compression spring support in the analysis.  

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