.. function:: uniaxialMaterial('TDConcrete', matTag, fc, fct, Ec, beta, tD, epsshu, psish, Tcr, phiu, psicr1, psicr2, tcast) :noindex: This command is used to construct a uniaxial time-dependent concrete material object with linear behavior in compression, nonlinear behavior in tension (REF: Tamai et al., 1988) and creep and shrinkage according to ACI 209R-92. =================================== ============================================================================ ``matTag`` |int| integer tag identifying material ``fc`` |float| concrete compressive strength (compression is negative) ``fct`` |float| concrete tensile strength (tension is positive) ``Ec`` |float| concrete modulus of elasticity ``beta`` |float| tension softening parameter (tension softening exponent) ``tD`` |float| analysis time at initiation of drying (in days) ``epsshu`` |float| ultimate shrinkage strain as per ACI 209R-92 (shrinkage is negative) ``psish`` |float| fitting parameter of the shrinkage time evolution function as per ACI 209R-92 ``Tcr`` |float| creep model age (in days) ``phiu`` |float| ultimate creep coefficient as per ACI 209R-92 ``psicr1`` |float| fitting parameter of the creep time evolution function as per ACI 209R-92 ``psicr2`` |float| fitting parameter of the creep time evolution function as per ACI 209R-92 ``tcast`` |float| analysis time corresponding to concrete casting (in days; minimum value 2.0) =================================== ============================================================================
Note
- Compressive concrete parameters should be input as negative values (if input as positive, they will be converted to negative internally).
- Shrinkage concrete parameters should be input as negative values (if input as positive, they will be converted to negative internally).
.. seealso:: `Detailed descriptions of the model and its implementation can be found in the following:` `(1) Knaack, A.M., Kurama, Y.C. 2018. Modeling Time-Dependent Deformations: Application for Reinforced Concrete Beams with Recycled Concrete Aggregates. ACI Structural J. 115, 175-190. doi:10.14359/51701153` `(2) Knaack, A.M., 2013. Sustainable concrete structures using recycled concrete aggregate: short-term and long-term behavior considering material variability. PhD Dissertation, Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA, 680 pp` `A manual describing the use of the model and sample files can be found at:` `<https://data.mendeley.com/datasets/z4gxnhchky/1>`_