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Is there any paper or document that provides a reference for the Hysteretic Material Model, with the solution scheme and the model develpment

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I created a small model with zerolength element connecting two point with the same co-ordinates then i changed the coordinates so they are different i got the same response in both cases Is that possible??? This is the model # -------------------------------------------------------------------------...

Follows is a model of just one disp baed beam element under earthquake motion. and I plot the moment curature at the integration point (1). when i use damping based on the initial stiffness i get a moment curvature which is totaly different than the one based on the last committed stiffness. which d...

I think if ound what caused this it is the slope of the softening branch in the material law, it was too gentle

Follows is a script for a SDOF it works with nemark but once i change the intergrator to explicit schemes like central diffference or explicit newmark it fails at the first step Any Suggestions??? Thanks # SET UP ---------------------------------------------------------------------------- wipe; # cl...

Follows is my model, it model a nonlinear beam column under cyclic lateral load. When I get the moment curvature relationship the moment capacity is higher than what i get by manual calculations which is supposed to be 4 kips.inch Any mistakes in the model difinition you can see? Thanks # SET UP ---...

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well, that works fine but i had a small problem, I have a gravity load step after which i keep the load constant and reset the time to zero by: loadConst -time 0.0 then i start my time history analysis this is my recorder: recorder Node -file $dir/node1.txt -time -dT .001 -node 1 -dof 1 2 disp; the ...

Is there anyway that i specify the recorders to collect data every N steps of the solution

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