The OpenSees Community

The following are undocumented commands that may be very useful in a variety of problems and applications, which I have tested in transient analysis and worked fine: #Displacement time Series alternative to Multisupport pattern # applies displacement series SP constraint at node 20, dof 2 (free), fa...

it is possible to run opensees via matlab m-file with the command: ! OpenSees Inputfile.tcl , by putting them in the same current work directory. It is then possible to run Opensees in a matlab loop by changing/varying the input parameters and writing a new .tcl input file in each iteration, say a M...

you can also try to explore OpenSeesPL as a good start. Although it is primarily for soil-pile interaction problems, but it uses 3D model (solids) for the soil elements. you can study the contents of the generated tcl input file (nodes, elements, materials, constraints and boundaries, analysis, etc....

Has anyone made some explicit dynamic analysis with Opensees such as impact modeling and wave propagation? I'm trying to simulate impulse echo test on a pile by applying a short impact loading at the top at very small duration (0.00008 s) and studying acceleration/velocity reflections at the top due...

i see. so that is why for the moment these elements are just mostly used for continuum modeling of soils and rarely/not for structural members. because I was just thinking despite these limitations whether I can use either of these stdBrick and Brick8N elements to model 3D solid structural members i...

since these elements only have 3 translational DOFs at each node with no rotation (-ndm 3 -dof 3), are there any further improvement on these 2 solid elements (stdBrick and Brick8N) to be used in 3D solid modeling of structural members such as columns, beams, slabs, footings, or piles..? or can they...

Hi all, I have a load history of a dynamic force with distance [i.e., x=distance (m) and y=force (kN)], which was obtained from a truck vehicle-pavement roughness interaction analysis program. Now I want to apply this dynamic load on a simply supported bridge girder subjected to the load history of ...

reset after the gravity analysis:

loadConst -time 0

you might be applying a pile axial load that is way too big for your total skin-friction and end-bearing resistances. try smaller axial loads. "integrator LoadControl 1" and "analyze 2" means double the applied load. try "integrator LoadControl 0.1" and "analyze 10...

Although workshop notes and handouts would be available sometime later after the presentation, is it also possible that the lecture presentations be vid eo recorded for download later? I really find it very helpful for users from other countries who cannot come to America for the 2 day event, but st...

..it's fine with mine running OpenSees in WindowsXP on my x64bit computer (2.83GHz quad CPU, 8Gb ram)

just make sure you followed the install instructions for ActiveState tcl correctly, especially the part on changing the install directory to C:\Program Files\Tcl

at the moment I am performing uncoupled analysis of axial soil-pile interaction to study negative skin-friction (NSF) under the effects of a consolidating soil due to surcharge load using 1D soil-pile model with Tz-Qz springs, by: (1) performing a separate finite difference analysis of consolidation...

fmk wrote: " you cannot put the viscous material in parallel with the other .. the parallel material will ignore the viscous material .. "... hope this gets noted on the manual for viscous uniaxial material. a lot of people are getting into the mistake of having this damping material model...

opensees.berkeley.edu/OpenSees/manuals/usermanual/documents/PySimple1GenDocumentation.pdf

I used MatLab for that, and I have been running OpenSees inside MatLab. In your m.file just insert the code:

! OpenSees filename.tcl