record of the node rotation

[alihaji1365]

hello
i want get rotation of node at the top of the shear wall in every story, in opensees manual the node recorder command have displacement response, even blow this command noted in parenthesis ''translational & rotational'' but i dont know strictly what response or command i use for record rotation response of node.

Node Recorder
The Node type records the displacement, velocity, acceleration and incremental displacement at
the nodes (translational & rotational)

can you help me? beforehand i thanks.

[vesna]

if your node has 3 DOFs here is an example of recording a rotation:

recorder Node -file rot.out -time -node 10 -dof 3 disp;

Note: the first two dofs are translations and the 3rd dof is rotation

[alihaji1365]

hello
In shear wall buildings, however, 'story drift' itself is not appropriate
as a damage measurement because part of this drift represents only a rigid body rotation at higher
stories. To remove this meaningless rigid body rotation, the rotation of the previous story was
subtracted at every story. how i can record this drift type in script?

[vesna]

it is not clear to me what you are trying to record.

[alihaji1365]

hi vesna
i want apply incremental dynamic analysis on rc shear wall and get pure envelop drift (not envelop drift) for every story by subtracting rotation of previous story muliply to story height from total drift of story and finally get maximom of this pure drift for every story for every level of applied earthquake
i can mail the more explanation by text and figure if you give your email

[vesna]

there is no such recorder in OpenSees. record drifts and rotations using OpenSees commands and then derive your quantity of interest.