The OpenSees Community

Hi,
There is a problem with using damage recorder that must be fixed in the source code, and not with specifying the Tcl input. I have an old (1.6.2) version of OpenSEES that is debugged.

Unfortunately, I don't know how to fix this in the new versions of Opensees.

I have the same problem with running OpenSees 2.2.1 on Windows 7 (x64).

The error reads
"The application was unable to start correctly (0xc000007b)."

Any help is much appreciated.

Hello, In order to run a time-variant reliability analysis in OpenSees, the random variables for the artificial ground motion must be specified. It appears that in the OpenSees v. 2 and v. 2.1, the artificial ground motion is not working properly. I found that the input random variables are not upda...

Hello, In order to run a time-variant reliability analysis in OpenSees, the random variables for the artificial ground motion must be specified. It appears that in the OpenSees v. 2 and v. 2.1, the artificial ground motion is not working properly. I found that the input random variables are not upda...

Hi, Dynamic reliability analysis is not a trivial problem and most likely FORM is not going to converge at design point, depending on the type of response (peak, displacement, stress, strain, etc) in the limit-state function. If you want to carry out any other reliability anlaysis (e.g., sampling), ...

I have the same problem while running sampling analysis. After certain number of runs (~50 for a fairly large model, ~10000 for a small model) I get the same message "opensees.exe has encountered a problem and needs to close..." I would like to know why this occurs. The problem is independent of the...

Hello civilmanjun, The primary difference between FORM and sampling results is if sampling has high coefficient of variation (COV). From your results I saw your COV is about 8% which isn't bad. Therefore, the other causes due to this difference are 1)if the limit-state surface is nonlinear, SORM cou...

I would like to have a look at output of the sampling analysis (output in file Example1f.out).
I am not sure what is the coefficient of variance of the failure probability obtained from sampling.

"rvReduction -file $filename.tcl $Num_of_RV"

The above command goes in the line before "performanceFunction".

Hi fmk,

It would be great if OpenSees utilizes all processors in multi-core PCs.

Are there any future plans to parallelise reliability code too?
Some reliability methods could easily lend themselves to this.

Thanks,

I think it is a bug due to changes in OpenSees. I suggest you email the information in your last message to the OpenSees developers.

Does anyone know how to input a vector in Matlab as ground motion in OpenSees?

I want to do this without saving vector to file and using file as ground motion in Tcl.

Will I be able to do that?

The steel01 material is bilinear. Therefore the limit-state function may suddenly change before and after the yielding. In that case, the convergence in FORM analysis is not guaranteed. From your errors I could see that other search algorithms failed to converge. This is not a problem with the OpenS...

Hi civilmanjun, Please post the errors with other search algorithms and results you obtained with iHLRF. I am not sure if you have syntax errors (running OpenSees) with the other search algorithms or the convergence problems (getting correct results). Depending on the limit-state function in your pr...

Hi civilmanjun, Regarding performance function with "rec_node_disp_2_2": The problem is not with reading the syntax. The error is due to the calculation of gradients of limit-state function. It could be due to numerical round offs in the code itself. [Note: u_2_2, and rec_node_disp_2_2 are treated d...