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!

*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

Deflection calculation of D Fir-L Decking for specified concentrated load

Deflection calculation of D Fir-L Decking for specified concentrated load

Deflection calculation of D Fir-L Decking for specified concentrated load

(OP)
I am trying to calculate the deflection of D Fir-L decking using the specified concentrated load (NBCC 2010 4.1.5.9) for a serviceability limit of span/240. I tried using equation based on plate theory (Timoshenko) to calculate the deflection but my calculated span is nowhere near the ones provided in CWC's Wood design manual. Please see the attached.

D Fir-L properties according to CSA O86-14:
Grade = Commercial; E = 11000 MPa; thickness = 36 and 38 mm; Poisson's ratio (assumed) = 0.1; NBCC 2010 - concentrated load (roof) 1.3 KN on 200 x 200 mm; Deflection limit = span/240

I would appreciate if anybody can shed some light. Thanks.

RE: Deflection calculation of D Fir-L Decking for specified concentrated load

I believe their maximum limits are based on strength and not serviceability. at least as far as I can back calculate. If you are trying to meet the serviceability requirements you won't for the point load at their maximum spans.

If you notice in the decking selection tables the star that directs you to the your posted note only applies next to the maximum factored loads and not for the maximum specified loads.

RE: Deflection calculation of D Fir-L Decking for specified concentrated load

(OP)
Thanks a lot, jayrod12! I appreciate your time. It is also mentioned in the WDM. I missed that critical piece of information.

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


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