The OpenSees Community

Yes. The analysis does not start at all. I found this could be the source but I do not know how to fix it.

Hi, I am getting an error while I run a model in Openseessp with the triangle elements-tri31 (the same model works fine with quad elements), and I am wondering is there anyone else who faced the same problem? Does Mumps support tri31 elements? This is the error: """" Fatal error ...

Hi,

I am wondering if any of you guys knows a trick to apply an out-of-plane motion to a plane problem?
To clarify, imagine you have a quad element (x and y plane) and want to apply a force to it in the z-direction.

No, I do not fix them. But, the problem is the way MultiSupport command is defined. Look at this "in OpenSees, the prescribed motion is applied using single-point constraints" ! this command forces the node to be zero after the end of excitation which is not desired. Thanks for your replie...

That's the main problem. The command that you mentioned work as SP which forces the node to have zero displacement after end of the excitation which I do not want. I want to apply dashpots to the nodes to capture reflected waves.

Thanks Soheil,

I had a look on this example and thanks for the steps. It is fine. My main question is that how to apply displacement instead of load in the last step?

Hi,

As far as I understood, when you apply displacement, ( SP or imposedgroundmotion) OpenSees extrapolate the displacement of the node after SP to be zero which causes the dashpots assigned to the note not to work. Is there anyway to resolve this problem?

Thanks for your response.
But how can I loop over time?
Can you write a simple schematic code in order to do that? Should the analysis section be in the loop?

Bests

Thanks.
I think this video is useful for adding something to the main code, I am looking for something simpler.

Imagine that I can write it in tcl but how OpenSees understands that? How should I code it so that Opensees understands?

There are certain ways to apply an excitation ( e.g. plain ... )

Thanks

Is there any way to apply f(t) (random input) at the base of the model?
I know we can apply timehistory using file but I am wondering if there is a way to apply a function which reads the deltaT from the input code and then apply the f(t) at the model.

Thanks

Hi all, I am wondering if there a way to use results of an analysis as initial condition for the next analysis? For example, imagine that you wanna do static gravity analysis for an structure, then change some of the boundary conditions to do a dynamic analysis, how is it possible to do this? In reg...

It is sometimes tricky. But, if you follow the steps here, you should install it properly

http://www.dreamincode.net/forums/topic ... o-use-mpi/

For others to know, it was because of the type of the flag I used for recorder.

It is solved and works perfectly. Just a quick question, have you ever faced a condition that, OpenSees sequential solves a problem perfectly but OpenSeesSP cannot solve it? By not solving, I mean it seems to be solving but it does not record anything. My model has two material if it helps. I tried ...