Is there anyway to define the moment-rotation relationship for beams and columns. I tried placing 2D rotational springs at the connection points of beams and columns with the joint and assigning the hysteretic material but the damage coefficients complicates the definition and the result is not satisfactory.
Is there any other way to define the moment rotation relationship of a spring ?
Defining the moment-rotation relationship for beams and columns is possible. Look at this:
http://opensees.berkeley.edu/wiki/index ... Aggregator
If you want to use moment-curvature relationship here is a simple example:
set Mp 103.0474
set EI 71963.55; #sectionsl stiffness
set b 0.01
set matTag 1
set secTag 1
set eleTag 1
uniaxialMaterial Steel02 $matTag $Mp $EI $b 20 0.925 0.15
section Aggregator $secTag $matTag Mz;
element zeroLengthSection $eleTag $nodeR $nodeC $secTag
If you want to use moment-rotation here is a simple example:
set phi_y 0.01; # rotation at yielding
set Mp_phi_y [expr Mp/phi_y]
uniaxialMaterial Steel02 $matTag $Mp $Mp_phi_y $b 20 0.925 0.15
element zeroLength $eleTag $nodeR $nodeC -mat $matTag -dir 6
Make sure to constrain $nodeR and $nodeC usein equalDOF command:
equalDOF $rNodeTag $cNodeTag 1 2
I want to define using Hysteretic material, to be able to control the total rotation mechanism of the beams and columns.
I assign the predefined Hysteretic material to hinge sections of Beamwithhinges element. Does this change the situation since if I define moment-rotation (moment-curvature*hinge length) the results semms to be out of order.