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


LVL flat-wise bending

LVL flat-wise bending

LVL flat-wise bending

Has anyone come across material properties for standard LVL plies (Microllam or similar) with load applied to the wide face? Specifically I'm looking at an exterior header application in a high wind area, so some of the wall wind load will be transferred to the header. Weyerhauser has load-span tables for headers, but I'm not sure if these are applicable to all wind speeds?

I'm assuming there would be some sort of reduction in Fb and E since the wood is engineered to be loaded from a specific (i.e edgewise) direction?

And feedback is appreciated!

RE: LVL flat-wise bending

Those values should be pretty good, as are those for the normal bending orientation, since not much is changed. In the manufacturing the strands, chips or laminations or oriented for best advantage w.r.t. normal stresses (bending normal stresses) and those are in the same direction in either case. But, the wood species used, the glue resins used and the exact manufacturing process really influence the final mechanical properties. So, it’s best to know what brands are available in your area and then ask that particular manufacturer, the exact questions you asked in your OP. They will have literature for you, on their products.

RE: LVL flat-wise bending

Also: Get the ICC code evaluation report off MFG website or product literature. All values are published in these to satisfy product code approval.


RE: LVL flat-wise bending

Thank you both...very useful information. I was able to download the ICC report for Microllam and it had the information (plank loading) that I was looking for. In case anyone is interested, Fb was higher and Fv was lower for plank loading vs edge loading.

RE: LVL flat-wise bending

Not too surprising. There will be some good outer plys which are now the top and bot. fibers. But, then the max. horiz. shear stress will run parallel to the plys and glue lines near mid thickness, and these plys might be of a slightly lesser quality too.

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!


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