Time Dependent Material (Creep/Shrinkage)

Define the time dependent creep and shrinkage material data for concrete. The properties are applied to Construction stage analysis and Heat of hydration analysis.

From the Main Menu select Model > Properties > Time Dependent Material (Creep/Shrinkage).

Select Geometry > Properties > Time Dependent Material (Creep/Shrinkage) in the Menu tab of the Tree Menu.

Click Time Dependent Material (Creep/Shrinkage) in the Property Tool Bar.

Time Dependent Material (Creep/Shrinkage) dialog box

Click to define a new time dependent material property (creep/shrinkage). Click and to change and delete the data previously entered. Click to copy previously entered data.

Name

Enter the name of the material property, which is referred to by Time Dependent Material Link.

Code

Define the Code for which Creep/Shrinkage material properties can be defined.

• • •  When CEB-FIP(1990) is selected

      

      Add/Modify Time Dependent Material (Creep/Shrinkage) dialog box

      Characteristic Compressive strength of concrete at the age of 28 days

      Relative Humidity of ambient environment (40-99)

      Notational size of member

      Note
      1. In case the Notational Size of Member (h) for each element is different due to a changing section, ‘h’ for each element needs to be entered in Change Element Dependent Material Property.
      
      2. . In case the Composite Section for Construction Stage is used, ‘h’ for each Part needs to be entered in Composite Section for Construction Stage.

      Type of Cement

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

        : Produce the auto-calculated time dependent material property in a graph.

       

    •  When CEB-FIP(1978) is selected

      

      Add/Modify Time Dependent Material (Creep/Shrinkage) dialog box

      Characteristic Compressive strength of concrete at the age of 28 days

      Relative Humidity of ambient environment (40, 50, 70, 100)

      Notational size of member

      Note

      1. In case the Notational Size of Member (h) for each element is different due to a changing section, ‘h’ for each element needs to be entered in Change Element Dependent Material Property.

      2. In case the Composite Section for Construction Stage is used, ‘h’ for each Part needs to be entered in Composite Section for Construction Stage.

      Type of Cement

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

        : Produce the auto-calculated time dependent material property in a graph.

       

    •  When ACI209(1982) Code is selected

      

      Add/Modify Time Dependent Material (Creep/Shrinkage) dialog box

      Compressive strength of concrete at the age of 28 days

      Relative Humidity of ambient environment (40-99)

      Volume-surface ratio: The volume-surface ratio of the structure

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

      Init Curing Method: Initial curing method

      Concrete Compressive Strength Factor (a,b)

      Material factored ultimate value: The user may enter the ultimate values considering concrete properties by ACI code or User type.  

      Type

      1. • When ACI Code is selected

      Slump

      Fine aggregate percentage

      Air content

      Cement content

      1. • User is selected

      Material factored ultimate creep coefficient (1.3 ~ 4.15): Ultimate creep coefficient considering concrete properties

      Material factored ultimate shrinkage strain: Ultimate shrinkage strain considering concrete properties

        : Produce the auto-calculated time dependent material property in a graph.

       

    •  When PCA(1986) is selected

      

      Add/Modify Time dependent Material (Creep/Shrinkage) dialog box

      Compressive strength of concrete at the age of 28 days

      Ultimate shrinkage strain (500~800)

      Ultimate creep strain (3~5)

      Relative Humidity of ambient environment (40-99)

      Volume-surface ratio: The volume-surface ratio of the structure

      Reinforcement ratio of cross section of column segment

      Modulus of elasticity of steel

        : Produce the auto-calculated time dependent material property in a graph.

       

    •  When Combined (ACI209(1982) & PCA(1986)) is selected

      

      Add/Modify Time dependent Material (Creep/Shrinkage) dialog box

      Compressive strength of concrete at the age of 28 days

      Relative Humidity of ambient environment (40-100)

      Volume-surface ratio: The volume-surface ratio of the structure

      Creep

      Material factored ultimate creep strain: Ultimate creep strain considering concrete properties

      Volume-surface Ratio: Equation for Volume-surface Ratio  

      Loading aged factored (t : loading age): Equation for loading age coefficient  

      Shrinkage

      Material factored ultimate shrinkage strain: Ultimate shrinkage strain considering concrete properties

      Volume-surface Ratio: Equation for Volume-surface Ratio

      Progress of shrinkage with Time

      Reinforced concrete effect by PCA

      Reinforcement ratio of cross section of column segment

      Modulus of elasticity of Steel

        : Produce the auto-calculated time dependent material property in a graph.

       

    •  When INDIA(IRC:18-2000) is selected

      

      Add/Modify Time dependent Material (Creep/Shrinkage) dialog box

      Compressive strength of concrete at the age of 28 days

      Relative Humidity of ambient environment (40-99)

      Notational size of member

      Note

      1. In case the Notational Size of Member (h) for each element is different due to a changing section, ‘h’ for each element needs to be entered in Change Element Dependent Material Property.

      2. In case the Composite Section for Construction Stage is used, ‘h’ for each Part needs to be entered in Composite Section for Construction Stage.

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

       : Produce the auto-calculated time dependent material property in a graph.

    •  When European is selected

      

      Add/Modify Time dependent Material (Creep/Shrinkage) dialog box

      Characteristic compressive cylinder strength of concrete at the age of 28 days (fck)

      Relative Humidity of ambient environment (40-99)

      Notational size of member

      Note

      1. In case the Notational Size of Member (h) for each element is different due to a changing section, ‘h’ for each element needs to be entered in Change Element Dependent Material Property.

      2. In case the Composite Section for Construction Stage is used, ‘h’ for each Part needs to be entered in Composite Section for Construction Stage.

      Type of Cement

      Type of Code

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

       : Produce the auto-calculated time dependent material property in a graph.

    • When AS 3600-2009 is selected

      

      Compressive strength of concrete at the age of 28 days

      Exposure Environment

      Arid

      Interior

      Temperate Inland

      Tropical or Near Coastal

      Hypothetical Thickness

      Note
      1. In case the Hypothtical Thickness of Member (h) for each element is different due to a changing section, 'h' for each element needs to be entered in Change Element Dependent Material Property.
      
      2. In case the Composite Section for Construction Stage is used, 'h' for each Part needs to be entered in Composite Section for Construction Stage.

       

      Drying Basic Shrinkage Strain

       

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

       

      : Produce the auto-calculated time dependent material property in a graph.

       

    • When AS/RTA 5100.5-2011 is selected

      

      Compressive strength of concrete at the age of 28 days

      Exposure Environment

      Arid

      Interior

      Temperate Inland

      Tropical or Near Coastal

      Hypothetical Thickness

      Note
      1. In case the Hypothtical Thickness of Member (h) for each element is different due to a changing section, 'h' for each element needs to be entered in Change Element Dependent Material Property.
      
      2. In case the Composite Section for Construction Stage is used, 'h' for each Part needs to be entered in Composite Section for Construction Stage.

       

      Drying Basic Shrinkage Strain

       

      Age of concrete at the beginning of shrinkage: The number of days elapsed after pouring of concrete, when the shrinkage is assumed to start.

       

        : Produce the auto-calculated time dependent material property in a graph.

       

    •  When User Defined is selected

      

      Add/Modify Time dependent Material (Creep/Shrinkage) dialog box

      Creep Function
      Select Creep Function. To add or modify Creep Functions to and from the list, click to prompt the dialog box, "Time Dependent Material (Creep/Shrinkage) Function".

      Loading Age: Assign the age (time) at which the members become subjected to loads (for instance, the number of days after which the formwork and/or shoring is removed after the concrete pour in the case of self weights)

      

      Add the defined Creep Function to the list in conjunction with Loading Age.

      

      Modify Loading Age pertaining to the registered Creep Function.

      

      Delete the registered Creep Function together with Loading Age.

      Shrinkage Strain Function
      Select Shrinkage Function to apply. Click to prompt "Time Dependent Material (Creep/Shrinkage) Function" dialog box to add or delete Shrinkage Function.