×
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.

#### Jobs

(OP)
I am studying up on Saddle Design using Bednar (2nd Edition) and Moss (4th Edition). Concerning longitudinal forces (wind, seismic, etc.) Moss computes an increased saddle load, and then goes through the shell stresses. To me, that seems to come short of a full analysis. First the fixed saddle will apply a moment to the shell that is not considered. Secondly, since the vertical load is increased on one saddle, then the other saddle will have a decreased vertical load. Add those two things up, and the simple overhanging simply supported beam formula doesn't accurately model the longitudinal bending moment in the shell.

What are your thoughts on this observation?

Are there any other published methods that provide a more complete analysis of longitudinal (and transverse) loads on saddle supported vessels?

### RE: Another Saddle Design Question

I am not up to date with those books but your observations appear to be correct. The critical area in the shell is near the horn of the saddle so the basic beam equations are not sufficient. To answer you section question, the best reference for this is the paper by Zick, but probably worth referring to PD5500 Annex G for the calculation method.

### RE: Another Saddle Design Question

My opinion, it (Zick w/ external loadings added) is enough of a mess already. Making it more complicated will not likely make it more accurate.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

#### 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!