plastic hing rotation of elements

[sabir]

hi all
i'm new user of opensees. i want to calculate the plastic hing rotation or maximum theta in ends of beams or calumns, to calculation the rotation ductility. but i dont now what command i have to use?
please explain the basicdeformation command?
and does opensees only calculate the curvarture? can calculate the element rotation?

[2015James]

sabir wrote:
> hi all
> i'm new user of opensees. i want to calculate the plastic hing rotation or
> maximum theta in ends of beams or calumns, to calculation the rotation
> ductility. but i dont now what command i have to use?
> please explain the basicdeformation command?
> and does opensees only calculate the curvarture? can calculate the element
> rotation?

I think you can use the recorder a section's deformation to get the curvarture, and recorder the node's dis to get the element rotation.

[sabir]

thank you can you explain the duty of recorder basicdeformation?

[vesna]

nodal displacement command will give nodal rotations (not elements rotations).

Basic deformation will give you axial deformation of the element and the rotations from element chord to the tangent on the node (either i or j) in the deformed configuration of the element.