record the curvature

mch_basim · Post by **mch_basim** » Sat Feb 21, 2009 1:11 am

Hi Silvia,
Thank you for help,
but I don't know how to record the curvature of the element in a fiber section and how to get plastic hinge length.

thanks,

silvia · Post by **silvia** » Sat Feb 21, 2009 9:57 am

the curvature is recorded by the section-deformation recorder in the element.
the plastic hinge length is not a recorder output. in the beamwith hinges you specify it, in the nonlinear beam-column element, it is equal to the weight of the integration point -- you can google that.

mch_basim · Post by **mch_basim** » Thu Feb 26, 2009 1:13 am

Hi Dr.silvia
Thanx a lot for your help.
I've better to use beamwithhinges element or nonlinearBeamColumn elements for plastic rotation record?
and what is the hinge rotation recorded by element recorder, total rotation or plastic rotation?
if total how should I calculate the max elastic rotation and remaining plastic rotation?

best regards
M Ch.Basim

mch_basim · Post by **mch_basim** » Thu Feb 26, 2009 7:35 am

I use following commands to record the rotation of plastic hing of a beamwithhinges element as mentioned in manual, but none of them record anything. Only an empty file with time!!!

element beamWithHinges 221 21 22 $BeamSecTag 0.5 $BeamSecTag 0.5 $Es 0.00973 0.00013670 $IDBeamTransf;

recorder Element -file data/RotBeam1sec1.out -time -ele 221 section 1 rotation;
or
recorder Element -file data/RotBeam1sec1.out -time -ele 221 rotation;

Thank you

silvia · Post by **silvia** » Thu Feb 26, 2009 8:33 am

please refer to the manual, rotation is not an option.
you have to ask for deformation or deformations.