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 Properties > Time Dependent > Creep/Shrinkage.
Click -Add(b).jpg){kind=small}
to define a new time dependent material property (creep/shrinkage). Click -Modify(b).jpg){kind=small}
and -delete(b).jpg){kind=small}
to change and delete the data previously entered. Click .jpg){kind=small}
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(2010) is selected
Characteristic Compressive strength of concrete at the age of 28 days
Relative Humidity of ambient environment (40-99)
Notional size of member
Note
1. In case the Notional 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.
Type of aggregate
Creep Calculation Process
Shrinkage Calculation Process
-Show_Result(b).jpg){kind=small}
: Produce the auto-calculated time dependent material property in a graph.
When CEB-FIP(1990) is selected
Characteristic Compressive strength of concrete at the age of 28 days
Relative Humidity of ambient environment (40-99)
Notional size of member
Note
1. In case the Notional 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
Characteristic Compressive strength of concrete at the age of 28 days
Relative Humidity of ambient environment(40 - 100)
Notional size of member
Note
1. In case the Notional 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
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
Revision of Civil 2011
Concrete Compressive Strength Factor
Material factored ultimate value: The user may enter the ultimate values considering concrete properties by ACI code or User type.
Type
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When ACI Code is selected
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Slump
Fine aggregate percentage
Air content
Cement content
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-
User is selected
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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.
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
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.
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.
Expose to drying before 5 Days of curing: If this option is checked on, the influence of Creep & Shrinkage is increased by 20% (ref. AASHTO 5.4.2.3.Shrinkage and Creep).
: Produce the auto-calculated time dependent material property in a graph.
When INDIA (IRC:18-2000) is selected
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.
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.
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 & 2016 & 2017 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 NZ Bridge(SP/M/022) is selected
Compressive strength of concrete at the age of 28 days
Exposure Environment
Arid
Interior
Temperate Inland
Tropical or Near Coastal
Relative Humidity Factor for Shrinkage (0.20~0.72)
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(10^6) (570-~1500)
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.
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_Creep_Function(b).jpg){kind=small}
Add the defined Creep Function to the list in conjunction with Loading Age.
-Modify(b).jpg){kind=small}
Modify Loading Age pertaining to the registered Creep Function.
-Delete(b).jpg){kind=small}
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.