"tangentDrift" recorder of forcedBeamColumn element

[etahmasebi]

Does anybody know what are the outputs of "tangentDrift" recorder for a forcedBeamColumn element? It has two columns of data. I looked at the -xml file format but Response Types are not specified there. Looking at Figure 1 of this paper:

"Model for Cyclic Inelastic Buckling of Steel Braces"
Patxi Uriz; Filip C. Filippou; and Stephen A. Mahin, JOURNAL OF STRUCTURAL ENGINEERING, 2008
(http://ascelibrary.org/doi/pdf/10.1061/ ... 4%28619%29)

I am guessing it could be (∆u_bar_x)⁄L and (∆u_bar_y)⁄L. Usually element drift is the latter one.

My second question is that is it possible to record element deformations (NOT basic deformations) in local reference system? It is possible for forces by using "localForce" keyword. Any help is greatly appreciated.

Thanks

[vesna]

Do not have idea what could be the "tangentDrift". You can either look at the source code or create a simple example to figure it out.

You can record sectional deformations (curvature, axial strain,...) that are in local coordinate system by using Element recorder and the following arguments:
-ele 1 section 1 deformation