The OpenSees Community

It seems that compiling OpenSees using VisualStudio instead of downloading it form OpenSees website can mitigate the problem. The instructions on how to compile OpenSees on your computer available from some YouTube: https://www.youtube.com/watch?v=BLcY1w7a5Ec AND https://www.youtube.com/watch?v=cOsA...

Today I downloaded the latest version of OpenSees (Version 3.5.0 64-Bit). The last update of my OpenSees was 2 years ago, and I found a few differences between the old one and the new one. I needed to install Tcl when I installed the old one, but this time it seemed that I just needed to download Op...

Thanks #selimgunay for your response. In case I want to use tangent stiffness proportional damping with instantaneous frequency, how can I get that instantaneous frequency? I think usually the modal analysis result gives us the first modal frequency (but not the instantaneous.) If we take a look at ...

Hi, Can you tell me what is the meaning of the error message that I get from the example "Dynamic Analysis of 2-Story Moment Frame" (on OpenSees Wiki page)? When I source the .tcl file, I get the following message: WARNING: analysis .. TransientAnalysis already exists => wipeAnalysis not i...

Dear Sir/Madam: I would like to know how to write in .tcl file tangent stiffness proportional damping on updated frequencies? This tangent stiffness proportional damping on updated frequencies is discussed in references such as: Finley A. Charney, "Unintended Consequences of Modeling Damping in...

Hello,

I want to know how I can use timeSeries when I have different time step for each step (corresponding to each data in displacement history).
For example, can I write time step in a file like displacement history and then use it?? How can I do that?

Thanks!

Hello,

I found that the example for "ZeroLengthImpact3D" element generates zero-reaction, which is different from the output provided by the author of this element.
It seems this element is corrupted, or hasn't been adjusted to the latest version of OpenSees (v2.5.0).

Hello, I got a following error message when I run analysis that place static loading on my structure: WARNING BandGenLinSOE::BandGenLinSOE : ran out of memory for A (size,super,sub) (22533, 22514, 22514) StaticAnalysis::handle() - LinearSOE::setSize() failedStaticAnalysis::analyze() - domainChanged ...

Hi, I wonder if we can record modal properties (modal displacement or modal period) per each time step. For example, the bridges with nonlinear materials have different period when the structure enters inelastic response under strong earthquake motion. If this is possible, how can we write the recor...