×
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

Buckling vs. Flexural Bending

Buckling vs. Flexural Bending

Buckling vs. Flexural Bending

(OP)
Hi, what is the difference between Buckling and Flexural Bending. I am trying to understand the failure mechanism of piles under liquefaction. When liquefaction occurs, there will be a decrease of lateral soil support and the pile may suffer buclinkg instability (if the pile is socketed into the bedrock). I read that if there is a non-liquefied layer above a liquefiable layer, the pile may fail by flexural bending rather than bucking. This is more critical where there is potential of lateral spreading, since the pile will be subjected to large passive lateral pressure by the non-liquefied layer.

Is there any important difference between those 2 terms? Are the boundary conditions involve in this?

RE: Buckling vs. Flexural Bending

In the context of vertical piles, pure buckling failure is failure due to an initial very small load eccentricity being magnified because the resisting moment generated by deflection is smaller than the additional moment due to that deflection.

Pure flexure failure is failure due to an externally applied moment or deflection exceeding the moment capacity of the section.

In any real situation failure will be due to a combination of the two, if the pile has a compressive axial load.

Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/

RE: Buckling vs. Flexural Bending

(OP)
IDS, thanks for your comments. What I am understanding from your post, is that P-delta effect may cause buckling failure. And pure flexure failure is due mainly to lateral loading. Is that correct?

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