The OpenSees Community

Hi everybody, I am running some time history analyses through an OpenSees code. In some cases when the ground motion time is long, the analysis stops and this error shows up: Vector: : Vector<int> - out of memory creating vector of size 1514 I changed the solver from BandGeneral to UmfPack, but it s...

Hi everyone, I have to make a soil (hyperbolic) and an impact element in series. They act perfectly alone but when I add them up as series, the new material is not behaving as it should. Could you please take a look at the code and let me know what you think? Can we say it is deficiency coming from ...

How about if I have a "columnwithhinges" element?

Dear everybody, I am having a reinforced concrete column and I have to record the curvature of the section at the bottom of column. I was wondering if there is any direct recorder to get the data. The column is under bi-directional ground motion, so it would be great to get the resultant curvature. ...

Hi everyone, I am using an impact material in my model and as far as I understood, it is the only reason of unconvergency after a few seconds for a time history analysis. I am using this combination to do time history analysis. Do you know how I can deal with this unconvergency? Should I change any ...

Thanks Vesna, I am using Variable Transient Analysis. If I defined the analysis like below, does it change the time step to different values between the minimum and maximum values so that get the concergency? I don't think it does! What do I have to do if I would like to change the time step where t...

Hi, Does anybody know: Should the analysis time step be the same as ground motion time step, how much can it be smaller? Does OpenSees automatically break the ground motion into the "analysis time step"? Does OpenSees have the ability to define a variable "analysis time step"? Th...

Hi everyone,

Have you ever tried to model the hysteresis behavior of a brace such as a single angle or do you have any idea about how I can get that behavior in Opensees?

Thank you.

I solved it. Thank you. But I have a question about Remove recorder tag that I just posted on board. I would appreciate it if you reply to it asap.
Thank you.

Hi everyone,
I am trying to remove an element recorder but I don't know what the "recorder tag" is.
Thank you.

I found out what was wrong with it. Thank you.

By changing the order of nodes or opposite the sign of the components used to define x-vector.

Hi everyone, I am having a problem in getting the hysteresis of a Hyperbolic element. I have defined the material like this: set Kmax 83.15; # Initial stiffness of soil behind the backwall (Kip/in/ft) set Fult 30.25; # Ultimate (maximum) passive resistance of soil behind the backwall (Kip/in/ft) set...

In definition of zero length elements, there is a yp vector. I am wondering if this vector is perpendicular to local x vector or not. And what is the difference between local yp and local y?
thanks

Hi everyone.
I have defined a zero length element with a defined longitudinal direction and I only assigned a material in this direction. When I reverse the direction of longitudinal direction, I get different result!!! Does anybody know what I have to do?