Contact US

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!

*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

Shear Mobilisation Factor - ACI code

Shear Mobilisation Factor - ACI code

Shear Mobilisation Factor - ACI code

I am design a retaining wall and I would like to understand if I have to use the Shear Mobilization Factor in my calculation or not in ACI code.
Is there a criteria to use this Factor?
As I understood, the SMF will be the inverse of Safety factor?
for example, if the safety factor is 3/2, then the SMF will be 2/3?

RE: Shear Mobilisation Factor - ACI code

Are you talking about a strength reduction factor, or something else?

What ACI code if you have the terminology correct as SMF, as never heard of that term?

RE: Shear Mobilisation Factor - ACI code

It was explained in ERDC/ITL TR-02-3 (U.S Army Engineer Research and Develop - U.S Army Corps of Engineers), this Strength factor will increase the lateral force produced by Soil.

RE: Shear Mobilisation Factor - ACI code

Firstly, I don’t think you understand what’s a SMF. This a a special moment resisting frame. Where you mentioned that this System would increase the the lateral force produced by the soil, this is wrong.

These frames increase the resistance To seismic and wind lateral forces When comparing it to the other force resisting system. There are criteria to be satisfied in the neherp provisions.

Design of with smf factors are not even close to what you’re asking.

Anyways, I’ve never heard of such factor mentioned. The only one I know of is the shear utilization factor.

RE: Shear Mobilisation Factor - ACI code


As I understood, the SMF will be the inverse of Safety factor?

In general sense, it is correct, as it is a single factor on the driving side of an equation, simply thinking as Mu = ØMn, Mu/Ø = Mn.
For the nature of works of its dealing, USCOE has developed many design manuals with its own (quite conservative) load factors. For example, one factor was incorporated into ACI provisions on "design of hydraulic structures" - the hydraulic load factor 1.3. If your project is oversight by USCOE, then you have to stick to their standards/design manuals and apply the factors accordingly. It would be sometimes deemed over conservative for designs fall under the ACI umbrella, and the factor is addressed nowhere in the code.

RE: Shear Mobilisation Factor - ACI code

@retired13: great reply.
You know exactly how to explain things.
Thanks a lot for all

RE: Shear Mobilisation Factor - ACI code

Thank you for the positive feed back, glad to be helpful.

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close