TDConcreteEXP
^^^^^^^^^^^^^

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.

.. function:: uniaxialMaterial TDConcreteEXP $matTag $fc $fct $Ec $beta $tD $epsshu $psish $Tcr $epscru $sigCr $psicr1 $psicr2 $tcast

.. csv-table:: 
   :header: "Argument", "Type", "Description"
   :widths: 6, 4, 40

    "``$matTag``",       integer, "integer tag identifying material"
    "``$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"
    "``$Tcr``",          float, "creep model age (in days)"
    "``$epscru``",       float, "ultimate creep strain (e.g., taken from experimental measurements)"
    "``$sigCr``",        float, "concrete compressive stress (input as negative) associated with $epscru (e.g., experimentally applied)"
    "``$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/5>`_