ConcreteD

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

uniaxialMaterial ConcreteD $matTag $fc $epsc $ft $epst $Ec $alphac $alphat <$cesp> <$etap>

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

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NOTES:

• Concrete compressive strength and the corresponding strain should be input as

negative values.

• The value $fc/$epsc and $ft/$epst should be smaller than $Ec.
• The default value for $cesp and $etap are 0.25 and 1.15, respectively.

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EXAMPLE:

Example 1: Simulation of compressive test in Karson and Jirsa (1969).

uniaxialMaterial ConcreteD 1 -27.6 -0.002 3 0.0001 35000 1.0 0.1 0.25 1.15

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REFERENCES:

• Karsan, I. D., and Jirsa, J. O. (1969). “Behavior of concrete under compressive loadings.” Journal of the Structural Division, 95(12), 2535-2563.
• Ministry of Housing and Urban-Rural Development of the People’s Republic of China.

(2010). “Code for design of concrete structures.” GB50010-2010, Beijing, China.

• Ren, X. D. (2010). Multi-scale based stochastic damage constitutive theory for concrete.

Doctoral dissertation, Tongji University, Shanghai. (in Chinese)

• Wu, J. Y., Li, J., and Faria, R. (2006). “An energy release rate-based plastic-damage model for concrete.” International Journal of Solids and Structures, 43(3), 583-612.
• Zeng, S. J. (2012). Dynamic Experimental Research and Stochastic Damage Constitutive

Model for Concrete. Doctoral dissertation, Tongji University, Shanghai. (in Chinese)

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Code Developed: Zengyong Wan, Decheng Feng, Xiaodan Ren, Jie Li, College of Civil Engineering, Tongji University,