×
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

Modeling WT in Risa.

Modeling WT in Risa.

Modeling WT in Risa.

(OP)
I am modeling a Truss in RISA.  I am using WT members as Braces.  These braces are modeled with Flanges horizontal for horizontal braces. As they are connected to Gusset plates there may be bending due to eccentricity.  Can this be taken into account by the model.  If not what should be remedial measure other than calculating manually.

RE: Modeling WT in Risa.

Hi maneesha0702

I dont know if I understood well the question,
If the center of gravity of the "T" bracings coincide with the center of gravity of the Chord elements, then you dont have excentricity.
If you are talking about an excentricity perpendicular to the plane of the truss, and you want to calculate automatically by Risa, the you can use rigid arms. But this is a lot of work. Normally this excentricity ( when you have a plate welded over the stem of the T), is not so big, and normally is not considered.

If the excentricity is big ( make a manual check), maybe you need to chanche the "T", for a box member.

RE: Modeling WT in Risa.

If I understand your question correctly, I could be wrong but I don't believe Risa has the ability to axially load a member at a location other than it's neutral axis.

One idea would be to use the axial force from the member detail report to manually calculate the moment induced by the eccentricity from the gusset plate to the members neutral axis.  Then apply a distributed or point load to the member in the correct direction to equal the calculated moment.     

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