Rotation

[Jhno]

Hi,
I have the following code I used to test the recorder element results and I have questions I hope somebody can help me with!
Here's the code :
wipe all;
model BasicBuilder -ndm 2 -ndf 3

node 1 0. 0.
node 2 0. 1.
fix 1 1 1 1
source section.tcl
geomTransf Linear 17
#element forceBeamColumn eleTag i-node j-node nbr Int secTag transfTag
element forceBeamColumn 1 1 2 5 105 17


system BandGeneral
test NormDispIncr 1.e-5 30 1
constraints Transformation
integrator LoadControl 1 1 1 1
algorithm KrylovNewton
numberer RCM
analysis Static

recorder Element -file test_donne.out -time -ele 1 basicDeformation


timeSeries Linear 1 -factor 1.
pattern Plain 1 1 {
load 2 1. 0. 0.
}

When I run the analysis, I understand I get epsilon and end rotation. However, I did fix node 1 in all three DOF. When I issue a print node 1 it display correctly that it hasn't move (0 displacement in all three dof) but when I check the result files, I have rotation at both ends?
I wonder if the rotation I see is computed at the closest integration points to the end node and this is what I get displayed in the recorder? If not, why am I not seeing zero in the recorder for rotation at node 1 ?
Thanks!

[fmk]

you are not recording the node rotation, but the element deformation .. the element deformations are 1: axial and 2+3: CHORD rotations. There is a difference.

[Jhno]

Thanks for the precision.