Description:

Model B3 for creep and shrinkage of concrete according to [1].

What can be modified:
  • Parameters specifying concrete properties, shape and dimension of specimen, humidity of environment and type of curing.
  • t' ... age of concrete at loading (for computation of compliance and relaxation function and shrinkage).
  • t ... age of concrete for which the values of compliance function, relaxation function and shrinkage are displayed.
Comments:
  • [1] Zdeněk P. Bažant, Sandeep Baweja (2000). "Creep and Shrinkage Prediction Model for Analysis and Design of Concrete Structures: Model B3." in Adam Neville Symposium: Creep and Shrinkage - Structural Design Effects , A. Al-Manaseer (ed), American Concrete Institute, pp. 1-83.
  • [2] Zdeněk P. Bažant, Mija Hubler, Milan Jirásek (2013). "Improved Estimation of Long-Term Relaxation Function from Compliance Function of Aging Concrete." J. Eng. Mech., 139(2), 146–152.
  • According to [1], the compliance function and shrinkage is computed. Approximation with analytical function Q is used for evaluation of the compliance function.
  • According to [2], approximation of relaxation function is computed.
  • Button "snapshot" creates a copy of current curves visible also after change of parameters (useful for comparing different parameters). Button "hide/show" is used to hide or show these curve copies.
  • After chenge of input parameters, click on "update" button to apply the changes.
Notice:
  • Creep never fully stops. For old ages, it increases approximately logarithmically.
  • Shrinkage is related to concrete drying and for old ages it approaches a finite value.
  • For lower humidity of environment, the final value of shrinkage is higher.
  • Humidity of environment influences both shrinkage and creep.
Contact: jan.stransky(at)fsv.cvut.cz
Last update: 25th September 2018
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