Massive castings of concrete can result in premature cracking of the structure prior to its service life. This can be especially detrimental in cases, for example, of hydraulic structures. Choice of the mix, of time and sequence of casting can help to reduce or preclude any cracking. In some cases, cooling techniques can also be used. Young hardening concrete behavior is also relevant in case of casting on a pre-existing structure, both in case of enlargement of the structure, or reparation. DIANA offers a range of young hardening concrete models and the possibility to predict cracking with linear or more detailed nonlinear analysis.

The analysis of the structure in its young age can be followed by a sequence of other analyses, which simulate different events during the life of the structure. This makes possible to model more realistically the stress state at any time in the life of the structure, and to identify possible deficiencies during construction, which may cause damage or reduce performance of the structure.

DEDICATED FEATURES FOR THE ANALYSIS OF YOUNG HARDENING CONCRETE

 

  • Coupled thermo-stress with automatic conversion of temperature field to mechanical loading
  • Possibility to add/remove elements or change boundary conditions during the analysis
  • Calculation of heat of hydration from:
    • direct input of the heat production as function of the degree of reaction 
    • preprocessing from the adiabatic curver
    • user supplied subroutine 
  • Heat transfer by conduction, convection and radiation
  • Dependence of thermal material properties on temperature, time and degree of reaction
  • Time dependence on the convective heat coefficient, to simulate presence or removal of scaffolding, and presence of wind
  • Cooling pipe elements
  • Evolution of Young's modulus according to: 
  • Reinhardt model 
  • Model codes (CEB-FIP Model Code 1990 & 2010, Eurocode, ACI 209, AASHTO, NEN 6720/A4, JSCE, JCI, KCI) 
  • Laboratory curves 
  • User supplied subroutine 
  • Visco elasticity: Double Power Law, Kelvin and Maxwell chains 
  • Crack prediction with tensile strength utilisation index and degree of reaction dependent tensile strength (linear analysis) 
  • Crack prediction with non linear analysis: 
    • Smeared crack models with: 
      • Degree of reaction dependence of the tension cut-off and tension softening 
      • Degree of reaction dependence of shear behaviour 
      • Degree of reaction dependence of compression functions 
    • Discrete crack model with degree of reaction dependence of the tension cut-off and tension softening
  • Visco-elasticity with temperature dependent Young's modulus: Power law, Kelvin and Maxwell chains 
  • Transient creep 
  • User-supplied subroutines

In addition to the young hardening concrete technical data and specifications below, see also the general technical information (to the right of this page).  Our range of brochures are also available for download.  Or, if you have a specific question about DIANA that you would like to ask, please use the webform.