×
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

Downdrag contribution by reinforced strap zone of MSE wall

Downdrag contribution by reinforced strap zone of MSE wall

Downdrag contribution by reinforced strap zone of MSE wall

(OP)
We calculated downdrag for abutment drilled shafts based on contribution of the reinforced strap zone of MSE wall and the underneath compressible soils. But the structure engineer said they typically do not consider downdrag in these locations. Is it reasonable?
Thanks a lot.

RE: Downdrag contribution by reinforced strap zone of MSE wall

Without knowing all the details and circumstances, it is hard to comment.  Generally, if a surcharge (e.g., MSE wall) is added over compressible soil, it should cause downdrag forces.  If the drilled shafts are end bearing on the bedrock, the downdrag forces does not come to effect in geotechnical bearing capacity.  However, they should be considered in structural design.

RE: Downdrag contribution by reinforced strap zone of MSE wall

More information would be helpful.  The downdrag becomes an additional load to be resisted by the foundation soils.  The geotech has to predict the load and the structural should make sure the foundation pile/pier can structurally withstand the additional load.  If this is a fiction pile, the pile will settle.  If it is an end bearing pile, the soil below the pile tip could be overstressed if the load was not considered.   

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