×
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

Laterally unsupported spec STAAD

Laterally unsupported spec STAAD

Laterally unsupported spec STAAD

(OP)
Hi guys,

What is the easiest way of extending a members effective length for a laterally unsupported situation? Like two members in the bottomcord of a truss. I don't get that comand in steel designer, maybe I'm just doing it wrong. Any help?

Cheers

RE: Laterally unsupported spec STAAD

Use the Ly or Lz command for the member in question. Depending on which direction the member is braced in apply an Ly (weak axis) or Lz (Strong Axis) parameter and use the value for the effective length of the member that you want it to be.
Example: If member 100 is unbraced for 20 ft. along the strong axis and you want to make the effective length 22 ft. use "Lz 22 Member 100" in the input file.

RE: Laterally unsupported spec STAAD

What n8engr said is true, but only for axial KL/r check.  If you need to define the unbraced length for bending, use the Ub and Ut variables, for unbraced bottom and top chords, or UL for overall unbraced length.  The way you input them is the same as the Lz variable above.

 

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