uniaxialMaterial('ConcreteD', matTag, fc, epsc, ft, epst, Ec, alphac, alphat, cesp=0.25, etap=1.15)

This command is used to construct a concrete material based on the Chinese design code.

matTag (int) integer tag identifying material
fc (float) concrete compressive strength
epsc (float) concrete strain at corresponding to compressive strength
ft (float) concrete tensile strength
epst (float) concrete strain at corresponding to tensile strength
Ec (float) concrete initial Elastic modulus
alphac (float) compressive descending parameter
alphat (float) tensile descending parameter
cesp (float) plastic parameter, recommended values: 0.2~0.3
etap (float) plastic parameter, recommended values: 1.0~1.3


  1. Concrete compressive strength and the corresponding strain should be input as negative values.
  2. The value fc/epsc and ft/epst should be smaller than Ec.

See also