×
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

Fig I-8, NBCC

Fig I-8, NBCC

Fig I-8, NBCC

(OP)
Quick question regarding note 2 attached to Fig I-8 (C and C loads) in the NBCC structural commentary. The note states " The abscissa area in the graph is the design tributary area within the specified zone". Does that mean the tributary area for the member under consideration or the area of the specified zone?

RE: Fig I-8, NBCC

trib area of member in question.

RE: Fig I-8, NBCC

Are you sure Jayrod ?

For me it seem it really mean the area of zone E ou W !

RE: Fig I-8, NBCC

That's how it's been explained to me. In all honesty though, when I design I just use 1 m^2 to determine my loads.

read it again "The abscissa area in the graph is the design tributary area within the specified zone." To me that reads you use the trib area of whatever member (stud, girt, column, etc) you are designing. The zone you are in just determines which line you pull your CpCg off of. It's their own version of LL reduction in my eyes.

RE: Fig I-8, NBCC

Jayrod, I agree with you. I read too fast, I missed the word "tributary".

I have the french version where the word "Design" is replaced by "Theorical" due to translation. If you miss the word tributary, the sentense can be intrepreted as "The theorical surface within he specified zone"

My mistake !

RE: Fig I-8, NBCC

Darn frenchies! Just kidding,

RE: Fig I-8, NBCC

(OP)
That would be my interpretation as well, however a coworker asked the NRC for an interpretation and they said it was the area of the zone and not the tributary area of the member under consideration. I also checked several older textbooks and they also use the member tributary area.

RE: Fig I-8, NBCC

It wouldn't make sense if it was the area of the zone. The way I see it, gust speed can be higher for a small area, thus a higher CpCg

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