Community
Robot Structural Analysis Forum
Welcome to Autodesk’s Robot Structural Analysis Forums. Share your knowledge, ask questions, and explore popular Robot Structural Analysis topics.
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Instability

9 REPLIES 9
SOLVED
Back to Robot Structural Analysis Products Category
Back to Topic Listing
Reply
Message 1 of 10
Anonymous
720 Views, 9 Replies
‎10-19-2013 02:00 AM
‎10-19-2013 02:00 AM

Instability

Im working on a 34 m rectangular truss.After running calculations..the results showed "instability" in some members.

Some had yellow color, others had red and yellow.

What do the colors means?

What is the efficiency ratio?

How can I solve this?

Report
0 Likes
Reply
9 REPLIES 9
Message 2 of 10
tony.ridley
Collaborator
in reply to: Anonymous
‎10-19-2013 05:02 AM
‎10-19-2013 05:02 AM

most likely (this yellow symbol) is to do with member slenderness.  

Report
0 Likes
Reply
Message 3 of 10
Anonymous
in reply to: tony.ridley
‎10-19-2013 08:56 PM
‎10-19-2013 08:56 PM

please find attached an image that shows the error..waiting for your feedback

Preview file
73 KB
Report
0 Likes
Reply
Message 4 of 10
tony.ridley
Collaborator
in reply to: Anonymous
‎10-20-2013 03:15 AM
‎10-20-2013 03:15 AM

red symbol is because the member is either over capacity (efficiency ratio > 1.0) or deflection is above the limit you specified.  

 

 

yellow symbol is what i mentioned before, the element slenderness is above what you have the maximum set to.  

 

 

2.JPG

Report
0 Likes
Reply
Message 5 of 10
Anonymous
in reply to: Anonymous
‎10-20-2013 03:47 AM
‎10-20-2013 03:47 AM

Thank you

Report
0 Likes
Reply
Message 6 of 10
Anonymous
in reply to: Anonymous
‎10-20-2013 04:53 AM
‎10-20-2013 04:53 AM

Is there any plug in for AASHTO automatic load combinations ?

Report
0 Likes
Reply
Message 7 of 10
tony.ridley
Collaborator
in reply to: Anonymous
‎10-20-2013 05:30 AM
‎10-20-2013 05:30 AM

not sure but the truck database is already in there.  

Report
0 Likes
Reply
Message 8 of 10
Anonymous
in reply to: tony.ridley
‎10-20-2013 05:36 AM
‎10-20-2013 05:36 AM

What about reinforced concrete combinations? i.e automatic load combinations conforming to AASHTO LRFD

Report
0 Likes
Reply
Message 9 of 10
tony.ridley
Collaborator
in reply to: Anonymous
‎10-20-2013 05:45 AM
‎10-20-2013 05:45 AM

not sure, but doubt it

Report
0 Likes
Reply
Message 10 of 10
Rafal.Gaweda
Autodesk Support
in reply to: tony.ridley
‎10-21-2013 02:15 AM
‎10-21-2013 02:15 AM

No AASHTO LRFD in Robot.


Rafal Gaweda
Report
0 Likes
Reply
Reply

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report

Report a website issue