×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Brom's Method Laterally Loaded Piles

## Brom's Method Laterally Loaded Piles

(OP)
The parameter 'e' from Brom's method, is usually described as the 'height of lateral load above grade'

So, if I have a billboard, and the resultant of the wind forces are at the center of that billboard, will 'e' then be the distance from the center of the billboard to grade? Or is it from the top of the pile/underside of baseplate to grade? Thank you!

### RE: Brom's Method Laterally Loaded Piles

It depends on your support conditions. The eccentricity is there to account for the moment and rotation at ground level.

If you've framed it with multiple piles and bracing or some other arrangement such that you can assume only shear loads at the top of pile cap then it will be top of pile cap to ground. If it's a moment frame, or single posts, or otherwise has a moment being applied to the pile then the e is such that the moment works out. So yeah, on a cantilevered sign it should be from ground to the point where the load actually works.

Additionally, in the past, when there's a moment from a source other than a purely cantilevered horizontal load I've taken e as whatever arm is necessary to create the groundline moment with the groundline shear (i.e. (M at groundline)/(V at groundline) = e. ) I don't actually have any literature that supports that, but it's always seemed to make rational sense. A moment is a moment.

### RE: Brom's Method Laterally Loaded Piles

I agree with with TLHS. 'e' should be determined by M/V.

TLHS - I worked out the statics years ago for the situation where you have an additional applied moment and it ends up being identical to how you approach it.

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!