×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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.

Students Click Here

Area Loads for Non-Rectangular Area

Area Loads for Non-Rectangular Area

RE: Area Loads for Non-Rectangular Area

Should be fine to crates nodes at the vertices of each area, then trace the distributed load between those nodes. The nodes must be in the same plane as the framing elements that they are tributary to.

RE: Area Loads for Non-Rectangular Area

In RISA-3D, area loads are either triangular or quadrilateral. So, you'd have to break a larger area down into Triangular and Quadrilateral areas. This is because the program is a general FEM program and not necessarily geared towards building type structures.

Now, there are programs (RISAFloor, ETABS, RAMSteel) that are more geared toward "area loading" of a floor system. That's because these programs are very much geared towards commercial buildings.

RE: Area Loads for Non-Rectangular Area

(OP)
Thanks for the responses.
I put a dummy member on top of the walls then I extended and trimmed them to produce a node at the corners. To me, that was easier than finding the x value of this node and the y value of that node...There's probably an easier way, but it didn't take too long.

RE: Area Loads for Non-Rectangular Area

Any floor plate will naturally be broken up into rectangular/triangular sections (In your case, all rectangles), unless it's curved, which is a whole other problem (and even then, structurally, it's probably just triangles).

You don't need 1 area load for the whole floor, any sub-set of area loads that fill the whole area and land on members at each of their edges should be fine. Even weird shapes can be alight, but I try and help RISA out as I can when I'm modeling, I at least keep things nice and square where possible. I would probably draw your area loads between each girder line, and at each change in building perimeter, which likely corresponds to a girder line.

Modeling properly in RISA (or any FEM modler) is kind of an art, less an exact science.

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! Already a Member? Login



News


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