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!

*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.

Jobs

autocadd massprop command question

autocadd massprop command question

(OP)
Hello All,
I am trying to obtain the moment of inertia of built up steel members by drawing the sections in AutoCadd and using the massprop command. When I check AutoCadd's results with hand calcs, it appears that AutoCadd is computing the section properties about at the lower left hand point of the section.

Is there a way to have AutoCAD compute the section properties about the centroid of the composite section?

Any ideas would be appreciated!

RE: autocadd massprop command question

AutoCAD MASSPROP appears to calculate the properties about the x and y axes (0,0 coordinates).
Move the object and you'll get different results.

MASSPROP also reports moments about the centroid, isn't that what you want?

RE: autocadd massprop command question

Try this: run massprop, then move the object from the calculated and centroid location to 0,0, then run mass prop again. You will see what it does calculates clearly by comparing the massprop outputs.

RE: autocadd massprop command question

If you want to leave the cross-sections where they are, instead you can place a POINT at the coordinates of the centroid, then set the origin at that point (UCS, Origin, click the point).
Then run MASSPROP again. The centroid should be found at 0,0 and the Ix / Iy will be around the centroidal axes.

STF

RE: autocadd massprop command question

(OP)
Thank you for the solution!

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


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