Creep/Shrinkage Model |
The design code model used to determine creep and shrinkage
strains over time. Available selections include ACI 209R-92 (ECR Values),
ACI 209.2R-08/GL 200, AS 3600-2018, and Eurocode 2-2004. See Creep and Shrinkage Models for additional
information. |
Initial Load Application |
The time of application of the initial loads. This becomes the start time of the first load history step specified in the Load History Criteria page. |
Cure Duration |
The duration of the moist cure period. This is used in the calculation of shrinkage strains. |
Ageing Coefficient |
The coefficient that accounts for various behaviors in the calculation of sustained loads. See Load History Deflections for additional information. |
External Shrinkage Restraint |
A percentage of the free shrinkage strain to consider as externally restrained. The shrinkage restraint is used to calculate a hypothetical tension strain which is included in the tension stiffening calculations. The user may select one of the pre-set options mapped below or enter a specific value in the field box. See Load History Deflections for additional information. |
Basic Creep Coefficient |
(ACI 209.2-08/GL2000, AS 3600-2018, and Eurocode 2-2004 only). The unadjusted creep factor or coefficient as defined by the selected code model. When code is selected the coefficient is determined as outlined in Creep and Shrinkage Models. You may also enter a specific value in the field box. |
Basic Shrinkage Strain |
(ACI 209.2-08/GL2000 only). The unadjusted shrinkage strain as defined by the selected code model. When code is selected the coefficient is determined as outlined in Creep and Shrinkage Models. You may also enter a specific value in the field box. |
Basic Autogenous Shrinkage Strain |
(AS 3600-2018 and Eurocode 2-2004 only). The unadjusted autogenous shrinkage
strain as defined by the selected code model.. When code is selected
the coefficient is determined as outlined in
Load History Deflections . You may also
enter a specific value in the field box. |
Basic Drying Shrinkage Strain |
(AS 3600-2018 and Eurocode 2-2004 only). The unadjusted drying shrinkage
strain as defined by the selected code model. When "code" is selected
the coefficient is determined as outlined in Load History Deflections . The user may also
enter a specific value in the field box. |
Relative Humidity |
(ACI 209.2-08/GL2000 and Eurocode 2-2004 only). The relative humidity as a percentage used to determine adjustment factors for the basic creep coefficient and/or basic shrinkage strain. |
Environment |
(AS 3600-2018 only). The environment classification used to determine adjustment factor k4 for the basic drying shrinkage strain that is defined in AS 3600-2018 3.1.7.2
Option | Description |
---|
Arid |
k4 = 0.7 |
Interior |
k4 = 0.65 |
Temperate Inland |
k4 = 0.60 |
Tropical/Coastal |
k4 = 0.50 |
|
Exposure |
(ACI 209.2-08/GL2000, AS 3600-2018, and Eurocode 2-2004 only).Option to
define the concrete surfaces subject to shrinkage, which is used as an
adjustment factor for creep and shrinkage strain in some code models.
Options | Description |
---|
Top and Bottom |
Both top and bottom of the cross section used to calculate surface area subject to shrinkage. |
Top Only |
Only the top of the cross section used to calculate surface area subject to shrinkage. |
Bottom Only |
Only the bottom of the cross section used to calculate surface area subject to shrinkage. |
|
Cement Class |
(ACI 209R-92 (ECR Values), ACI 209.2-08/GL2000, and Eurocode 2-2004 only). The cement type used to determine adjustment factors for various parameters in the creep and shrinkage models. Options for ACI 209R-92 (ECR Values) and ACI 209.2-08/GL2000 are Type I, Type II, and Type III. For ACI 209R-92 (ECR Values) Type II results is assumed equivalent to Type I. Options for Eurocode 2-2004 are Class S, Class N, and Class R. |