what is changed for the domain if I do "analyze 1" with fail

[foxchameleon]

Hi All

I have a question on OpenSees as shown in the title "what is changed for the domain if I do "analyze 1" but if it failed with the following error message:

analyze failed, returned: -3 error flag

I think the domain is not changed, but I the following problem I had below confused me:

At a certain time step (state of the domain) after several successfully analysis steps, I continue to analyze 1 step more by "analyze 1", but the error message is popping out as above (returning -3). While, if I insist to run the model one more step by doing "analyze 1" again, it starts to work fine (returning zero) without any error message, and I checked that the domain is changed as I expected based on the some node displacements check. What do you think could be the problem?

[fmk]

nothing should change and it should fail again if you do the same analysis step.

[foxchameleon]

Hi, Frank

Thank you. Yeah, that is what I thought, but I have a case which is not working as we thought. I am sending you the example I have by email. In order to repeat the problem I have, you just need to run the example and wait for less than one minute (with successful "analyze" for the previous steps), then try to analyze two more steps by doing: "analyze 1", "analyze 1", and see what we can get from these two trials. Thanks!