Search found 16 matches

by sanazzz
Fri Apr 28, 2017 6:55 am
Forum: Parallel Processing
Topic: Triangle elements
Replies: 5
Views: 2572

Re: Triangle elements

Yes. The analysis does not start at all. I found this could be the source but I do not know how to fix it.
by sanazzz
Thu Apr 27, 2017 7:25 am
Forum: Parallel Processing
Topic: Triangle elements
Replies: 5
Views: 2572

Triangle elements

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 in MPI_Recv: Message...
by sanazzz
Thu Apr 06, 2017 8:21 am
Forum: OpenSees.exe Users
Topic: Out of plane wave in two-dimensional problem
Replies: 0
Views: 418

Out of plane wave in two-dimensional problem

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.
by sanazzz
Fri Mar 24, 2017 7:10 am
Forum: OpenSees.exe Users
Topic: Applying displacement and absorbing boundary condition
Replies: 6
Views: 1544

Re: Applying displacement and absorbing boundary condition

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 replies. Bests
by sanazzz
Tue Mar 21, 2017 2:59 pm
Forum: OpenSees.exe Users
Topic: Applying displacement and absorbing boundary condition
Replies: 6
Views: 1544

Re: Applying displacement and absorbing boundary condition

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.
by sanazzz
Fri Mar 17, 2017 5:55 pm
Forum: OpenSees.exe Users
Topic: Applying displacement and absorbing boundary condition
Replies: 6
Views: 1544

Re: Applying displacement and absorbing boundary condition

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?
by sanazzz
Fri Mar 10, 2017 5:47 pm
Forum: OpenSees.exe Users
Topic: Applying displacement and absorbing boundary condition
Replies: 6
Views: 1544

Applying displacement and absorbing boundary condition

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?
by sanazzz
Sun Jan 22, 2017 5:28 pm
Forum: OpenSees.exe Users
Topic: Random excitation
Replies: 6
Views: 1650

Re: Random excitation

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
by sanazzz
Mon Jan 16, 2017 11:24 pm
Forum: OpenSees.exe Users
Topic: Random excitation
Replies: 6
Views: 1650

Re: Random excitation

Thanks.
I think this video is useful for adding something to the main code, I am looking for something simpler.
by sanazzz
Fri Jan 13, 2017 9:04 pm
Forum: OpenSees.exe Users
Topic: Random excitation
Replies: 6
Views: 1650

Re: Random excitation

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
by sanazzz
Sat Dec 10, 2016 2:25 am
Forum: OpenSees.exe Users
Topic: Random excitation
Replies: 6
Views: 1650

Random excitation

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
by sanazzz
Sat Nov 12, 2016 2:19 pm
Forum: OpenSees.exe Users
Topic: Using data as Initial condition
Replies: 4
Views: 755

Using data as Initial condition

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...
by sanazzz
Fri Nov 04, 2016 9:23 pm
Forum: Parallel Processing
Topic: A Problem in Running OpenSeesSP
Replies: 5
Views: 3747

Re: A Problem in Running OpenSeesSP

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/
by sanazzz
Tue Nov 01, 2016 9:11 pm
Forum: Parallel Processing
Topic: Windows 10
Replies: 19
Views: 5787

Re: Windows 10

For others to know, it was because of the type of the flag I used for recorder.
by sanazzz
Tue Nov 01, 2016 6:02 pm
Forum: Parallel Processing
Topic: Windows 10
Replies: 19
Views: 5787

Re: Windows 10

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 ...