nonlinear beamcolumn iteration

[jackmil]

hello dear frank
hello dear vesna

would you please tell me about the defference between iteration command in element nonlinearbeamcolumn and iteration in test command in transient analysis?
Can I use a different tollerance for bracing element and another one for beam and column elements?

I want to decrease the precision of tollerance in bracing members.

[fmk]

the nonlinearBeamColumn is the same thing as the forceBEamColumn. It uses the force method for the element formulation. Used in a displacement based envirnment, each element requires internal iteration at each trial step to determine force distribution given the nodal displacements. The iter tolerance you can specify deals with each individual force based element. Have a look at the references on command page:
http://opensees.berkeley.edu/wiki/index ... mn_Element

the test command is used to test global convergence. It deals with the system formed by ALL the elements.

So yes different tolerances can be specified for different elements.

[jackmil]

I got it. thank you very much dear friend.