moment curvature analysis

[nrojas]

Hi:

I want to perform a moment-curvature analysis of a T beam using the scrip available in opensees. For example, in Section Builder it is posible to specify the angle of the section. If one use 0 degree, its means that the bottom rebars are in tension and the top rebars are in compression. If one specify 180 degrees, its perform the analysis with the top rebars in tension and the bottom bars in compression. It is possible to do that with the scrip moment-curvature?

I have tried to do that in opensees, changing the sign of the applied moment, as follows:

# Define reference moment
pattern Plain 2 "Linear" {
load 2 0.0 0.0 -1.0
}
but it game me the same results if using the moment positive. It is a way to do that without changing the orientation of the section?

[silvia]

the load pattern is just a reference load, it will just multiply it by a negative number.
i think the analysis is displacement controlled, so you have to change the sign of the displacement history.

[nrojas]

Thanks Silvia. It works !!!!!!

I change the sign of the displacement history and gave me the results that I was specting.