×
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

Continuous Footing in expansive soils

Continuous Footing in expansive soils

Continuous Footing in expansive soils

(OP)
I am designing a residential foundation on potentially expansive soils. The geotech report gives recommendations for conventional continuous and spread footings, and also gives a differential deflection value of 1" in 30 ft. Is the typical method of analysis for this condition to compute the moments for the imposed displacement due to differential deflection and design the reinforcing for that moment. The required amount of reinforcing is getting above what is typical for the area, at least for residential. Makes me think that there might be a better approach.

RE: Continuous Footing in expansive soils

Can you dig thru the plastic clay down to better material?

RE: Continuous Footing in expansive soils

Well my argument would be 1" in 30 ft would be the upper bound of the differential settlement, which is L/360. Depending on the construction of the residence above, it can likely accommodate this amount of movement.

We put strip footings on expansive clays all the time here for residential. More and more homes are migrating towards piles but budget sensitive builders still do footings and they generally perform acceptably.

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