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

    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

    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

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

    Type

      • When ACI Code is selected

    Slump

    Fine aggregate percentage

    Air content

    Cement content

      • 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.

     

Revision of V.7.6.1

  •  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.

Revision of V.7.6.1

  •  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 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.