Computers and Concrete

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FE modeling of Partially Steel-Jacketed (PSJ) RC columns using CDP model

  • Ferrotto, Marco F. (Department of Civil, Environmental, Aerospace, Materials Engineering, University of Palermo) ;
  • Cavaleri, Liborio (Department of Civil, Environmental, Aerospace, Materials Engineering, University of Palermo) ;
  • Trapani, Fabio Di (Department of Structural, Geotechnical and Building Engineering, Polytechnic of Turin)
  • Received : 2018.02.23
  • Accepted : 2018.05.23
  • Published : 2018.08.25
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Abstract

This paper deepens the finite element modeling (FEM) method to reproduce the compressive behavior of partially steel-jacketed (PSJ) RC columns by means of the Concrete Damaged Plasticity (CDP) Model available in ABAQUS software. Although the efficiency of the CDP model is widely proven for reinforced concrete columns at low confining pressure, when the confinement level becomes high the standard plasticity parameters may not be suitable to obtain reliable results. This paper deals with these limitations and presents an analytically based strategy to fix the parameters of the Concrete Damaged Plasticity (CDP) model. Focusing on a realistic prediction of load-bearing capacity of PSJ RC columns subjected to monotonic compressive loads, a new strain hardening/softening function is developed for confined concrete coupled with the evaluation of the dilation angle including effects of confinement. Moreover, a simplified efficient modeling approach is proposed to take into account also the response of the steel angle in compression. The prediction accuracy from the current model is compared with that of existing experimental data obtained from a wide range of mechanical confinement ratio.

Keywords

References

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