# 4.14.2.11. ConcreteCM¶

uniaxialMaterial('ConcreteCM', matTag, fpcc, epcc, Ec, rc, xcrn, ft, et, rt, xcrp, mon, '-GapClose', GapClose=0)

This command is used to construct a uniaxialMaterial ConcreteCM (Kolozvari et al., 2015), which is a uniaxial hysteretic constitutive model for concrete developed by Chang and Mander (1994).

 matTag (int) integer tag identifying material fpcc (float) Compressive strength ($$f'_c$$) epcc (float) Strain at compressive strength ($$\epsilon'_c$$) Ec (float) Initial tangent modulus ($$E_c$$) rc (float) Shape parameter in Tsai’s equation defined for compression ($$r_c$$) xcrn (float) Non-dimensional critical strain on compression envelope ($$\epsilon^{-}_{cr}$$, where the envelope curve starts following a straight line) ft (float) Tensile strength ($$f_t$$) et (float) Strain at tensile strength ($$\epsilon_t$$) rt (float) Shape parameter in Tsai’s equation defined for tension ($$r_t$$) xcrp (float) Non-dimensional critical strain on tension envelope ($$\epsilon^{+}_{cr}$$, where the envelope curve starts following a straight line - large value [e.g., 10000] recommended when tension stiffening is considered) mon optional, monotonic stress-strain relationship only: mon=1 (invoked in FSAM only), mon=0 (no impact since monotonic) '-GapClose' (str) optional, denote next parameter is GapClose GapClose (float) optional, GapClose = 0, less gradual gap closure (default); GapClose = 1, more gradual gap closure