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The curvature is sampled at discrete points in the plastic hinge regions and treated as constant over the associated integration weights. Take a look at Fig.2 in the reference paper. The cross-hatched areas are the approximate integration of the "true" curvature distribution. Although the figure is ...

The comments were not meant to contradictory. Plastic hinge lengths are element parameters, thus defined in the local element coordinate system. Rigid joint offsets have nothing to do with the element formulations, and thus must be defined in the global coordinate system with respect to nodal locati...

The plastic hinge lengths are positive within the local axes. For the element formulation, see Scott, M.H. and G.L. Fenves. "Plastic Hinge Integration Methods for Force-Based Beam-Column Elements". Journal of Structural Engineering. 132(2);244-252, 2006. For your second question, I believe the offse...

Your input appears alright although there may be some units conversion errors. At any rate, try using an elastic section (instead of fiber section) in the analysis to see if you get the same initial stiffness for each element and if it matches the published results you mention. section Elastic $E $A...