Drift & Displacement

[civil]

Hi
As you know in first story: storydrift=story displacement, so in the following code it should be :

recorder Drift -file Data/drift-story1.out -time -iNode 3 -jNode 13 -dof 1 -perpDirn 2
recorder Node -file Data/Displacement-base.out -time -node 3 -dof 1 disp
recorder Node -file Data/Displacement-story1.out -time -node 13 -dof 1 disp

drift-story1.out= Displacement-story1.out- Displacement-base.out
drift-story1.out= Displacement-story1.out

but it is not so. The result is:
drift-story1.out:
17784.9 0.000260487
35569.8 0.000520974
53354.7 0.000781461
71139.5 0.00104195
…
Displacement-story1.out:
17784.9 0.000833559
35569.8 0.00166712
53354.7 0.00250068
71139.5 0.00333423
…

[fmk]

drift is displacement/height for first story.

read the command page on drift recorder:
http://opensees.berkeley.edu/wiki/index ... t_Recorder