The OpenSees Community

Is there a way to run OpenSees so that the header doesn't print to the stdout? I'm running a huge study and I think the writing to screen is bogging it down...a little, and every second counts.

Is there a way to do something like OpenSees -silent file.tcl ??

I just ran a fairly large model and it is using 3.9GB of memory, so I'm guessing it is 64-bit, whether it says it is or not...? Also, if anyone is interested, I built it using the new Windows 10 Ubuntu and it ran like a charm.

I built opensees using the instructions in the makefile.def, but the text when I run it says OpenSees blah blah (rev 6248) 32-Bit. I ran OpenSees and asked tcl what it's pointer size was and it was 8, so at least tcl is 64 bit. Did I miss something else?

Of course. I can compile OpenSees in general. What I'm asking is, which dependencies are needed in 64 bit. For instance, I know I need the 64 bit version of TCL8.5. Do I need a special BLAS or LAPACK or anything else?

I'm brand new to Linux. I'd like to install a 64 bit version of OpenSees, but I can't find a very clear instruction guide on how to do that with the latest version. I know I need some dependencies, and some of those have to be 64-bit version. I know that I also need to modify the makefile.def. I'm n...

I've been using OpenSeesSP lately to speed up some large models. I'd like to do a big parametric study with models on the order of 170,000 dof. Has anyone had any success in running opensees on the GPU? I'd like to send asynchronous models to the GPU to run independently to save time.

I have been looking at the zerolengthinterface2D element to use for contact between beams. There are two example scripts on the wiki for these. However, when I try to make the seperate structures come apart, as opposed to coming into contact, there are major issues. Is this element not capable of se...

Thank you, sir!

This isn't going to work. Kg alone does not cause interaction between the elongation DOF and the twisting DOFs. Right now, the only thing I can think of is to set up one of these: Fo = K*delta_o and use it as an effective force to get the structure to deform. I have problems with that though, one, w...

The current corotational transformation for 3D beam elements does not properly account for the non-additive nature of angular velocity and acceleration vectors. However, I am not certain that it makes a difference if there are no rotational masses. In other words, I am certain that angular vel and a...

Also, if you know a professor or researcher who would be a good resource on this matter, their name would be appreciated.

We have been looking at how the -disp tag works with nodes for assigning initial nodal displacements. For the elements that are based in a basic (natural) frame, not all of the initial displacements are taken into consideration. PDelta and Corotational correctly take nodal translations into account ...

I was considering how to build an eigen-solver for buckling problems. One big problem is that the elements do not necessarily have separate linear and nonlinear (geometric) stiffness matrices. Therefore, an approach must be developed to extract the geometric stiffness from the global tangent stiffne...

No apologies necessary. I'm glad to help contribute any way I can. The node.cpp revertToStart() may not be a problem, depending on what classes use initial displacements. The 3d coordinate transformations all grab initial displacements and store them as variables. The transformation revertToStart() ...

initialize - sets up system of equations but doesn't solve remove timeSeries $tag nodeReaction $nodeTag <$dof> - returns a tcl list of node reactions at the "time" when this command is called nodeResponse - like the eleResponse command, but for nodes eleForce $eleTag <$dof> - returns a tcl...