×
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

Error - Bisection may be activated

Error - Bisection may be activated

Error - Bisection may be activated

(OP)
Hi
I am trying to simulate a moving load for a bridge model. What I did is:
I am running a do-loop to move my axle loads over the nodes and in each step in the do loop i remove the load from the previous step ; solve the structure for the new load position and trying to get the results.

I am doing a linear static analysis using a SPARSE solver as I have MPC184 element in my model.

But only after one iteration of the do-loop the program issues an error msg which states:
"Bisection may be activated if it is a nonlinear analysis."

I am pretty much new to ANSYS and do not know how to tackle this problem.

Can anyone please help me !!

by the way I'm using ANSYS 8

Thank you

RE: Error - Bisection may be activated

do a modal analysis to make sure you are properly constraining your model. If you are then I've also seen an error of this type occur when you run out of disk space and for some reason(probably somethng to do with the element matrices not being properly written) this error is tripped. However I'm willing to bet you haven't properly constrained your model.

                Peter

RE: Error - Bisection may be activated

(OP)
Thanks for the reply Peter. But i already got rid of the problem. But I'm not sure what was exactly the error; could be because of disk space as u mentioned.
The model ran perfectly for a static load. In the moving load analysis I was using 5 substeps in each load step and I had about 150 of such load steps. Later I reduced it to 3 substeps and went through alright.
However thanks again for your reply

shan

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