×
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.

# How to calculate parapet loading for bridge when equal distribution not possible?

## How to calculate parapet loading for bridge when equal distribution not possible?

(OP)

Reviewing the uniform application of dead load requirement in AASHTO (Section 4.6.2.2.1 and Section 4.6.1.2.4b), the parapet loading will not be equally distributed among all the girders since the bearing lines of the curved girders that I am designing are skewed more than 10 degrees from radial.

AASHTO only says to use engineering judgement if the criteria for equal distribution is not satisfied.

Is the lever rule a way to designate loading for such a case?
Replies continue below

### RE: How to calculate parapet loading for bridge when equal distribution not possible?

This article is saying that you cant use approximate methods to do the analysis and that you need to use a refined analysis method, e.g. FEA. Doing an FEA will distribute the parapet to load to the girder based on the models stiffness.

### RE: How to calculate parapet loading for bridge when equal distribution not possible?

(OP)
I do not have a FEA software that can do this analysis. Is there a manual way around it, or ca this be approximated?

### RE: How to calculate parapet loading for bridge when equal distribution not possible?

Its a curved girder and AASHTO is telling you that your bridge is outside the criteria for using approximate methods.

Section 4.6.4 gives options for refined methods. You can do a grillage analysis but you would need to somehow approximate the forces in cross frames/diaphragms, which are primary members in a curved bridge.

### RE: How to calculate parapet loading for bridge when equal distribution not possible?

(OP)
Ok, I understand. Thank you.

#### 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!