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I am coding a new uniaxial material for soil which includes a viscous dashpot component to model radiation damping along with other elastic and plastic components. If the velocity during the previous converged step was nonzero, and then the trial displacement increment for the current step is zero, ...

Or even more simply (without the loops that are specific to my analysis), this produces the same crash: #Define load pattern at each node depth pattern MultipleSupport 2 { groundMotion 1 Plain -disp 1; groundMotion 2 Plain -disp 2; #Interpolate between 1 and 2 groundMotion 3 Interpolated 1 2 -fact 0...

#Define load pattern at each node depth pattern MultipleSupport 2 { #Ground surface motion groundMotion 1 Plain -disp 1; #Assign timeSeries at layer boundaries to grounMotion tags for {set j 1} {$j<= [expr $numlayers-1]} {incr j} { set istart [expr round(($layerTop($j)/$dz)+1)] set iend [expr round(...

I'm defining a Multi-Support Excitation pattern for my model, which works fine when I only use ground motions created using the "Plain GroundMotion" command via timeSeries that are read in from files. However, when I try to use the Interpolate GroundMotion command to generate additional gr...

I have a relatively simple program that applies lateral displacement to the head of a pile embedded in a soil profile. The pile is defined using nonlinearBeamColumn elements for flexure along with elastic models for shear and axial response. Soil is defined by pySimple1. Both the structural and soil...

I've written a simple program to track the force versus displacement relationship for a cantilevered column under displacement-controlled lateral loading, and I've discretized the column into "nonlinearbeamcolumn" elements. When I add an axial load, the column is not picking up additional ...

Can somebody explain the sign convention used when the recorder generates an output file for element forces? I realize that it's in terms of global coordinates, but I'm not altering the global coordinate system between the two nodes which define my element and yet I'm getting opposite signs for, e.g...

I am beginning a PhD program and am buying a new laptop. I will primarily be running geotechnical models in OpenSees, but also integrated geotechnical/structural models (not sure if that's the right terminology yet, sorry). Anybody have any laptop suggestions? What are the minimum specs for good per...