A Generic Damage-Plasticity Model for Conﬁned Concrete in Various Stress States

Yichen Lu; Guangming Chen

doi:10.1016/j.eng.2026.04.003

Engineering ›› :202604003 DOI: 10.1016/j.eng.2026.04.003

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A Generic Damage-Plasticity Model for Conﬁned Concrete in Various Stress States

Yichen Lu
, Guangming Chen ^*

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Abstract

Conﬁned concrete has garnered signiﬁcant attention owing to its advantages, such as enhanced strength, improved deformation capacity, and associated beneﬁts when used in engineering structures. Although existing constitutive models reasonably predict the behavior of actively and passively conﬁned concrete columns under axial compression, they are not designed to model concrete behavior in various stress states encountered in practice, including eccentrically compressed concrete columns passively conﬁned by ﬁber-reinforced polymer (FRP) sheets. Accordingly, this study presents a new three-dimensional damaged-plasticity model for conﬁned concrete under various stress states, based on the well-known Lubliner–Lee damaged-plasticity model. A key advancement involves a capped potential surface with a bulged triangular deviatoric trace under compression-dominated stress states and a Drucker–Prager potential surface under tension-dominated stress states, connected by a smooth transition. The potential surface, along with a properly designed yield surface, hardening rule, and evolution law for internal vari- ables, makes the proposed model well suited to capturing concrete behavior under various stress states, including triaxial compression, tension–compression, and loading–unloading. The constitutive model is ﬁrst validated against monotonic and cyclic axial-compression data for actively and passively conﬁned concrete and then veriﬁed using eccentric-compression results for FRP-conﬁned concrete. The validation conﬁrms the capability and accuracy of the proposed model to capture concrete behavior under various stress states.

Keywords

FRP / FRP-conﬁned concrete / Active conﬁnement / Passive conﬁnement / Constitutive model / Non-uniform conﬁnement / Eccentric compression / Cracking

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Yichen Lu, Guangming Chen. A Generic Damage-Plasticity Model for Conﬁned Concrete in Various Stress States. Engineering 202604003 DOI:10.1016/j.eng.2026.04.003

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