Confinement-sensitive plasticity constitutive model for concrete in triaxial compression

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Identification of material parameters for Drucker-Prager plasticity model for FRP confined circular concrete columns (2012, background): “However, it is inconsistent with the observation that the slope of plastic potential function should vary with the increasing lateral stress (Grassl et al., 2002; Han and Chen, 1985; Imran and Pantazopoulou, 2001; Papanikolaou and Kappos, 2007; Smith et al., 1989).”
Numerical Investigation of Load-Carrying Capacity of GFRP-Reinforced Rectangular Concrete Members Using CDP Model in ABAQUS (2019, neutral): “Also to quantify this stress ratio, Papanikolaou and Kappos [25] proposed equation (2) based on a large statistical data: σb0 σc0 � 1.”
Three dimensional combined fracture-plastic material model for concrete (2008, methodology): “The plasticity part is extended to include the formulations suggested by Papanikolaou and Kappos (2007), which describe the increased strength and deformation capacity of concrete under multiaxial compression and can properly handle problems including confinement effects.”
3D mesoscale finite element modelling of concrete (2017, neutral): “Generally speaking, with the increase of lateral confinement pressure, both the compressive strength and the ductility tend to show significant enhancement [43-45].”