×
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

Composite Beam Design

Composite Beam Design

Composite Beam Design

(OP)
On page 5-57 of ASD Manual, for composite beam design, the calculation of transformed section properties for stress check is always based on normal weight concrete, but for deflection checks we are asked to take into account whether the concrete is normal weight or light weight. Why is it so?

RE: Composite Beam Design

You could ask the AISC Solutions Center. They're super-fast and thorough.

Why not use LRFD composite design? The difference in results are extreme and it's also really easy to understand, unlike Allowable Stress Dinosaur's composite design, as illustrated by this thread. ;)

14159

RE: Composite Beam Design

(OP)
I have already emailed them .... no response yet. I cannot switch to LRFD I have to deal with the equations of ASD !

RE: Composite Beam Design

quest4more -
The modulus of elasticity (E) for normal weight and light weight concrete is different.  If you check out ACI - you'll see that for concrete - Ec = wc^1.5 x 33 x sqrt(f'c); where wc is the unit weight of concrete.

Thus, E is affected by density of the concrete.  So to get accurate deflections, you must use an accurate E which is based on the unit weight.

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