×
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

Ka for battered wall

Ka for battered wall

Ka for battered wall

(OP)
I am designing a gravity retaining wall for a state DOT using the AASHTO bridge design specifications. The wall will use large segmental blocks with a wall batter. I am calculating Ka using the batter of the back of the wall in the Coulomb equation. The reviewer says that I have to calculate Ka using a series of vertical faces. I believe that is contrary to generally accepted design pratice, but can find little justification for it in the AASHTO bridge manual. Can anyone provide any guidance on this?

RE: Ka for battered wall

Google "NHI 132042 GEC 11" and get the 2 volume MSE wall set.

RE: Ka for battered wall

(OP)
I have a copy and am familiar with those two publications. Unfortunately they only discuss reinforced walls and not gravity walls.

RE: Ka for battered wall

This is segmental gravity / conventional wall, no geogrid reinforcement correct?

I think the norm is to use the wall batter. I am not that familiar with AASHTO, but that is how NCMA does it. I'm not sure what he/you mean by using a series of vertical faces.
Could you show him fig 4-5 of NHI 132042 GEC 11 which uses the batter for finding Ka when performing external analysis. Which is the same thing you are doing with the gravity wall just without grid.

Just out of curiosity what system is it?

EIT
www.HowToEngineer.com

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