, experiments and tests showed that reinforced concrete structures have ductile behavior [ 6 ]. In addition, many nonlinear simulations preformed on reinforced concrete slabs to simulate yielding state used the layeredmodel [ 7 ]. The plastic theory illustrates
hypotheses (Leydesdorff 2010b ).
In this study, I develop this three-layeredmodel in empirical terms using aggregated citation relations among scientific journals as networks. Scientific journals are organized in functionally different groups. For