Fiber Command for Sensitivity

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Both 2-D and 3-D fiber sections are available for response sensitivity computation.
section Fiber $secTag {
fiber <fiber arguments>
patch <patch arguments>
layer <layer arguments>
}


References:
http://opensees.berkeley.edu/OpenSees/manuals/usermanual/index.html
Spacone E., Filippou F.C., Taucer F.F. (1996). “Fibre beam-column element for nonlinear analysis of R/C frames. Part I: Formulation.” Earthquake Engineering and Structural Dynamics, 25:711-725.