negative time?

macropaine · Post by **macropaine** » Sun Aug 02, 2009 12:38 am

Dr. Silvia,

There is negative time in my nonlinear anaytical result in recorder.
Could you tell me what likely causes this stange problem and how to solve it?
Thanks.

silvia · Post by **silvia** » Sun Aug 02, 2009 7:54 am

it is actually the pseudo time, proportional to the lateral load.
this should be in a static analysis, though, not in a dynamic analysis.

macropaine · Post by **macropaine** » Sun Aug 02, 2009 3:47 pm

yes. It is static analysis. But why the lateral load becomes negative? Is my model or constitutive law error?

silvia · Post by **silvia** » Sun Aug 02, 2009 6:19 pm

there is no concept of time in a static analysis.
you use that time to interpolate where you are in the lateral-load application.

macropaine · Post by **macropaine** » Sun Aug 02, 2009 7:44 pm

I have to get the lateral load from the time. I don't know how to determine the lateral load for the negtive time. So I think something is wrong. Should I check my model and constitutive law carefully?

silvia · Post by **silvia** » Mon Aug 03, 2009 6:01 am

nothing is wrong. the lateral load is proportional to time, you have to go back and see how you defined your lateral load vs. time/analysis increment.
i'd just use a recorder.

macropaine · Post by **macropaine** » Mon Aug 03, 2009 3:38 pm

[quote]i'd just use a recorder.[/quote]
What do you mean?
Thank you.