The OpenSees Community

Dear Friends
I have once faced a similar issue with my model. I found the issue was due to improper handling of Restrained and Constrained DOFs in defining in equalDOF command though there may be other causes also. When I correctly defined them, the issue was fixed and OpenSees showed correct periods.

Dear Friends, I got the following warning while running my parallel program in OpenSeesMP 3.0 version:

WARNING -- PathSeries::getDuration() on empty Vector

Can someone tell me the meaning of the warning and how to solve the issue? I am using timeseries definition as given below:

set AccelSeries "Series -dt $dt -filePath $outFile -factor $GMfatt"; # time series information
pattern UniformExcitation $IDloadTag $GMdirection -accel $AccelSeries; # create Unifform excitation

Dear Friends
My PC has 2 sockets and 4 cores (8 logical processors). I do parametric analysis (100 records) using OpenSeesMP. When I use -np as 2 or 4, the program runs fine. But for -np value 8, it runs for about half of the records (50) and then I get 'job aborted' error from anyone processor. I kindly invite your suggestion on this issue

Friends, Fixed it! It works if I place all my files in the same location including mpiexec.exe

I pulled up the source code from github repository

Thanks for your reply Selimgunay. I successfully compiled sequential version couple of months ago. But, for parallel version what change do I have make in during compilation to get it's exe? One more thing is that even for sequential version, now if I compile in VS 2017 it throws errors like Python.h is missing. I kindly request your solutions

Dear Community
OpenSeesMP throws error if I have any source *.tcl file inside main.tcl that I am executing in OpenSeesMP console. It simply errors with: No such file or directory. But, Frank's many examples in parallel and grid computing have such sourcing files inside main.tcl file. Please let me know what I do wrongly. Thanks

Dear Community
Can someone give me reference for building OpenSeesMP using Visual Studio 2017?

Dear Friends
I am facing problem in compiling OpenSeesMP from the source code available on gitHUB site. Does anyone have prebuilt OpenSeesMP.exe version 3.0.0? If yes, could please share it with me at kesavapraba@gmail.com

Hi Paysheen, I am facing the problem of installation of MPICH. Everything goes fine in the installation process up to "mpiexec -validate" and it fails at that step in my case. Could you please help me out installing mpich properly? Thanks a lot

Dear Community
I am new to parallel processing. So, I wanted to learn it. I installed all the requirements as per Dr. FMK's instructions. Then, I executed the ex4.tcl in my OpenSeesSP console. It threw an error saying that "Warning: No numberer type exists (Plain, RCM only)". Can anyone help me to understand the problem? Thanks. I add the ex4.tcl code below:

set pid [getPID]
set np [getNP]
puts $np
if {$np != 1} {
puts "ONLY WORKS FOR 2 PROCESSORS"
exit
}

model BasicBuilder -ndm 2 -ndf 2

uniaxialMaterial Elastic 1 3000

if {$pid == 0} {
node 1 0.0 0.0
node 4 72.0 96.0

fix 1 1 1

element truss 1 1 4 10.0 1

pattern Plain 1 "Linear" {
load 4 100 -50
}

} else {
node 2 144.0 0.0
node 3 168.0 0.0
node 4 72.0 96.0

fix 2 1 1
fix 3 1 1

element truss 2 2 4 5.0 1
element truss 3 3 4 5.0 1
}

# ------------------------------
# Create the recorders
# ------------------------------

recorder Node -file node4.out.$pid -time -node 4 -dof 1 2 disp

# ------------------------------
# Start of analysis generation
# ------------------------------

# Create the system of equation, a SPD using a band storage scheme
system Mumps
numberer ParallelPlain
constraints Transformation
integrator LoadControl 0.1
test NormDispIncr 1.0e-12 3
algorithm Newton
analysis Static

analyze 10

print node 4

Dear Friend
You can record the desired result quantity (forces/displacements etc.,) in either. txt or .Out or . dat files using 'recorder' command. Once you have got the files, using MATLAB ' load ' and 'plot' command , you can plot whatever graphs you are interested in. You can even see an example regarding section analysis part in Opensees i

Dear Friend
What uniaxialmaterial model did you use for retrofitted structure? It seems from your post that the retrofit model behaves something like elasto-plastic with strain hardening type. So, you may avoid convergence problem if you model that behaviour as Steel02 uniaxialMaterial as per OpenSees. Try it if you have not done already.

Dear Friend
Did you try using real time output commands, like nodeDisp, eleResponse etc.?

http://opensees.berkeley.edu/wiki/index ... t_Commands

Dear Sualim
I assume that the hysteretic loop that you mentioned means the backbone curve for the pushover curve. A hysteretic loop is required only during the cyclic analysis. The backbone curve in your case is multilinear, so there is a possibility of getting convergence error in such cases. The question is not about the ability of either OpenSees or FEMA356. You can still solve the problem in OpenSees (It is versatile in my perspective!) by suitably identifying proper analysis parameters such as load step, tolerance limit, or algorithm etc. All You can do is to understand the error and debug the code step-by-step by changing the above-mentioned parameters.