Precast concrete slab item properties


General
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Rotation angle	This property specifies: Span direction for 1-way load decomposition 2D solver element local axes in the solver model Different angles can be specified for individual slab items within the slab. Note: When SpanDirection is switched on in Scene Content, the rotation angle is represented by a blue arrow. See: Rotation angle for slab items and panels and Modify slab/panel span direction
Include in diaphragm	If this option is cleared, the slab item does not participate in diaphragm action. All nodes linked to the slab item will be able to displace independently of the diaphragm.
Plane	Indicates the level at which the slab is placed.


Slab general
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Slab type	Precast
Deck type	When the slab type is 'Precast', the deck type is 'Precast concrete plank's
Decomposition	When the slab type is 'Precast', decomposition is 'One-way'
Analyze slab	This option is only displayed for one-way decomposition slabs. When selected, the 1-way slab is enabled for finite element analysis in load decomposition, FE chasedown and optionally for 3D analysis. This option also activates additional Analysis parameters in the Slab Item properties to allow orthotropic properties to be specified. These parameters include a Y-factor defaulted to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). For further details, see: Define an orthotropic slab using relative stiffness factors


Slab parameters
Overall depth	Specifies the slab thickness.
Concrete type	• Normal • Lightweight
Concrete class [Eurocode], Grade [Other codes]	Specifies the concrete class [Eurocode], Grade [Other codes].
Concrete density class [Eurocode only]	For lightweight concrete only, specifies the density class.
Dry density, Dry density per area	Specifies the dry concrete density and dry concrete density per area
Wet density, Wet density per area	Specifies the wet concrete density and wet concrete density per area
Long term elastic modulus = Ecm divided by...	Factor by which the short term elastic modulus is divided to obtain the long term modulus .
Diaphragm option	Sets the default diaphragm action for all slab items within the parent slab. Rigid Semi-rigid None
Decking properties
Country, Manufacturer, Reference, Gauge	Defines properties of the precast concrete planks.
Reinforcement in slab for crack control or fire requirements [Only displayed for precast slab if topping has been specified]
Type, Rib type, Mesh type Class, Bar size	Defines reinforcement for crack control or fire requirements
Topping details
Topping	None Non-structural Structural
Depth	Depth of topping when topping other than 'None' is selected.
Analysis parameters [Only displayed for precast slab if 'Analyze slab' has been specified]
Orthotropic	By default, the slab item is treated as having isotropic material properties. Checking this option allows assigning orthotropic material properties. For further details, see: Orthotropic slabs
Calculate properties	Only available when ‘Orthotropic’ is checked. Allows setting material properties in two in-plane directions automatically based on the stiffness modification X and Y factors below. For details of how the parameters are calculated, see: Orthotropic slab implementation
X factor and Y factor	Only available when ‘Calculate properties’ is checked. Applies stiffness modification factors in the local X and Y directions For 1-way slabs the Y-factor defaults to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). Note: Applying the same stiffness modification factors in both directions is an alternative way of specifying stiffness adjustments of isotropic slab items.
Ex, Ey, Gxy, Gxz \| Gyz, 𝜈x, and 𝜈y	Allows manually setting material properties, such as Young’s moduli, shear moduli, and the Poisson’s ratio. The fields become editable when ‘Calculate properties’ is unchecked (except 𝜈y, which remains read-only). Note: No distinction is made between Gxz and Gyz out-of-plane shear moduli.
Apply modification factors	By default, the modification factors are applied. Unchecking this option ignores the modification factors for the slab item. See: Use of modification factors and Analysis settings


All edges, Edge 1, Edge 2 etc.
Linear	Uncheck in order to specify curved edges.
Curvature	Defines the amount of curvature to all edges. Only displayed when Linear is cleared.


UDA
Name Finish Class Phase Note File	A customizable list of the attributes that can be applied to individual members and panels. See: Create and manage user-defined attributes

Composite slab item properties


General
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Rotation angle	This property specifies: Span direction for 1-way load decomposition 2D solver element local axes in the solver model Different angles can be specified for individual slab items within the slab. Note: When SpanDirection is switched on in Scene Content, the rotation angle is represented by a blue arrow. See: Rotation angle for slab items and panels and Modify slab/panel span direction
Include in diaphragm	If this option is cleared, the slab item does not participate in diaphragm action. All nodes linked to the mat item will be able to displace independently of the diaphragm.
Override slab depth	By default all slab items in a slab adopt the same depth. Checking this option allows the selected slab item to have a different depth and vertical offset.
Vertical offset	Only available when ‘Override slab depth’ is checked. A positive offset raises the slab panel surface, a negative offset drops it. Note: Vertical offsets are not structurally significant
Plane	Indicates the level at which the slab is placed.


Slab general
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Slab type	Composite slab
Deck type	When the slab type is 'Composite slab', the deck type is 'Profiled metal decking'.
Decomposition	When the slab type is 'Composite slab', decomposition is 'One-way'
Analyze slab	This option is only displayed for one-way decomposition slabs. When selected, the 1-way slab is enabled for finite element analysis in load decomposition, FE chasedown and optionally for 3D analysis. This option also activates additional Analysis parameters in the Slab Item properties to allow orthotropic properties to be specified. These parameters include a Y-factor defaulted to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). For further details, see: Define an orthotropic slab using relative stiffness factors


Slab parameters
Slab properties
Overall depth	Specifies the slab thickness.
Concrete type	• Normal • Lightweight
Concrete class [Eurocode], Grade [Other codes]	Specifies the concrete class [Eurocode], Grade [Other codes].
Concrete density class [Eurocode only]	For lightweight concrete only, specifies the density class.
Dry density	Specifies the dry concrete density
Wet density	Specifies the wet concrete density
Long term elastic modulus = Ecm divided by... [Displayed for composite slab and precast only]	Factor by which the short term elastic modulus is divided to obtain the long term modulus .
Diaphragm option	Sets the default diaphragm action for all slab items within the parent slab. Rigid Semi-rigid None
Ponding allowance option, Ponding allowance value	If required, choose either value or percentage and then specify actual ponding allowance accordingly.
Apply ponding to construction stage	On = ponding allowance applied at construction stage.
Apply ponding to composite stage	On = ponding allowance applied at composite stage
Decking properties (where applicable)
Country, Manufacturer, Reference, Gauge	Defines properties of decking (where applicable).
Reinforcement in slab for crack control or fire requirements
Type, Rib type, Mesh type Class, Bar size	Defines reinforcement for crack control or fire requirements
Analysis parameters [Only displayed for composite slab if 'Analyze slab' has been specified]
Orthotropic	By default, the slab item is treated as having isotropic material properties. Checking this option allows assigning orthotropic material properties. For further details, see: Orthotropic slabs
Calculate properties	Only available when ‘Orthotropic’ is checked. Allows setting material properties in two in-plane directions automatically based on the stiffness modification X and Y factors below. For details of how the parameters are calculated, see: Orthotropic slab implementation
X factor and Y factor	Only available when ‘Calculate properties’ is checked. Applies stiffness modification factors in the local X and Y directions For 1-way slabs the Y-factor defaults to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). Note: Applying the same stiffness modification factors in both directions is an alternative way of specifying stiffness adjustments of isotropic slab items.
Ex, Ey, Gxy, Gxz \| Gyz, 𝜈x, and 𝜈y	Allows manually setting material properties, such as Young’s moduli, shear moduli, and the Poisson’s ratio. The fields become editable when ‘Calculate properties’ is unchecked (except 𝜈y, which remains read-only). Note: No distinction is made between Gxz and Gyz out-of-plane shear moduli.
Apply modification factors	By default, the modification factors are applied. Unchecking this option ignores the modification factors for the slab item. See: Use of modification factors and Analysis settings


All edges, Edge 1, Edge 2 etc.
Linear	Uncheck in order to specify curved edges.
Curvature	Defines the amount of curvature to all edges. Only displayed when Linear is cleared.


UDA
Name Finish Class Phase Note File	A customizable list of the attributes that can be applied to individual members and panels. See: Create and manage user-defined attributes

Flat slab properties


General
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
X direction	This property specifies: 2D solver element local axes in the solver model Bar direction Different angles can be specified for different panels within the slab. Note: When SpanDirection is switched on in Scene Content, the X direction is represented by a blue arrow. See: Rotation angle for slab items and panels and Modify slab/panel span direction
Include in diaphragm	If this option is cleared, the slab item does not participate in diaphragm action. All nodes linked to the slab item will be able to displace independently of the diaphragm.
Override slab depth	By default all panels in a slab adopt the same depth. Checking this option allows the selected panel to have a different depth and vertical offset.
Vertical offset	Only available when ‘Override slab depth’ is checked. A positive offset raises the slab panel surface, a negative offset drops it. Note: Vertical offsets are not structurally significant
Auto-design	For slab items in Auto-design mode, As,prov is increased until either a pass is achieved or the limiting reinforcement parameter limits have been exceeded. For slab items not in Autodesign mode, the result will be a pass or fail.
Select bars starting from	This option controls the starting point for auto-design procedures.
Plane	Indicates the level at which the slab is placed.


Slab general
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Slab type	Flat slab
Deck type	'Reinforced concrete', or 'Post tension'. 'Post tension' slabs can not be designed.
Decomposition	When the slab type is 'Flat slab', decomposition is 'Two-way'


Slab parameters
Slab properties
Overall depth	Specifies the slab thickness.
Concrete type	• Normal • Lightweight
Concrete class [Eurocode], Grade[Other codes]	Specifies the concrete class [Eurocode], Grade[ Other codes].
Concrete density class	For normal weight concrete only, specifies the density class.
Dry density, Dry density per area	Specifies the dry concrete density and dry concrete density per area
Wet density, Wet density per area	Specifies the wet concrete density and wet concrete density per area
Diaphragm option	Sets the default diaphragm action for all slab items within the parent slab. Rigid Semi-rigid None
Analysis parameters
Orthotropic	By default, the slab item is treated as having isotropic material properties. Checking this option allows assigning orthotropic material properties. For further details, see: Orthotropic slabs
Calculate properties	Only available when ‘Orthotropic’ is checked. Allows setting material properties in two in-plane directions automatically based on the stiffness modification X and Y factors below. For details of how the parameters are calculated, see: Orthotropic slab implementation
X factor and Y factor	Only available when ‘Calculate properties’ is checked. Applies stiffness modification factors in the local X and Y directions For 1-way slabs the Y-factor defaults to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). Note: Applying the same stiffness modification factors in both directions is an alternative way of specifying stiffness adjustments of isotropic slab items.
Ex, Ey, Gxy, Gxz \| Gyz, 𝜈x, and 𝜈y	Allows manually setting material properties, such as Young’s moduli, shear moduli, and the Poisson’s ratio. The fields become editable when ‘Calculate properties’ is unchecked (except 𝜈y, which remains read-only). Note: No distinction is made between Gxz and Gyz out-of-plane shear moduli.
Apply modification factors	By default, the modification factors are applied. Unchecking this option ignores the modification factors for the slab item. See: Use of modification factors and Analysis settings
Design parameters
Permanent load ratio [Displayed for Eurocode only]	You are required to supply a value for the permanent load ratio parameter. A default of 0.65 has been assumed, but you are advised to consider if this is appropriate and adjust as necessary.
Maximum crack width [Not displayed for ACI/AISC Regional Code]	The maximum center to center bar spacing for crack control is dependent on the maximum allowable crack width that is specified here.
Deflection parameters
Restraint constant [Displayed for ACI/AISC Regional Code only]	See: Restraint constant (ACI)
Restraint type [Displayed for Eurocode only]	See: Restraint type (EC2)
Cement class [Displayed for Eurocode only]	See: Concrete Properties (Eurocode)


*Live [ACI/AISC], Imposed [Other codes]* Load Reduction**
Reduce live [ACI/AISC], imposed [Other codes] loads by	This property is applicable for the design of transfer slabs and mats. Although the percentage of live load reduction is not determined automatically, this property allows you to specify the percentage manually. It can be applied to an individual slab item - you don't have to apply a single value throughout a slab or mat (this can be important if you have discrete transfer panels within a large slab area). • reducible loadcases are reduced • combinations incorporating reducible loadcases are reduced • The reduced results are used in slab design. Note: For mats, the bearing pressures are reduced as well.


Reinforcement
Top bars, Bottom bars	Slabs panels can potentially have 4 layers of background reinforcement, (however any of the layers/directions can be set to “none” if required). Select/clear Outside layer in X direction as appropriate to indicate if the outside layer is in the X or Y direction. (The outside layer can be set differently for the top and bottom bars if required.)
Top cover, Bottom cover	Specifies the top and bottom cover to reinforcement.


Utilization ratio
Apply (to autodesign)	Selected - When an Autodesign is performed, the design will be incremented to achieve a utilization ratio less than the ratio limit. Unselected - When an Autodesign is performed, the design will be incremented to achieve a utilization ratio less than 1.0. See: Apply user defined utilization ratios
Apply (to check)	Selected - When a Check is performed, the check will pass provided the utilization ratio is less than the ratio limit. Unselected - When a Check is performed, the check will pass provided the utilization ratio is less than 1.0.
Ratio limit	The utilization ratio against which the autodesign or check is performed (when applied above).


All edges, Edge 1, Edge 2 etc.
Linear	Uncheck in order to specify curved edges.
Curvature	Defines the amount of curvature to all edges. Only displayed when Linear is cleared.


UDA
Name Finish Class Phase Note File	A customizable list of the attributes that can be applied to individual members and panels. See: Create and manage user-defined attributes

Slab on beams properties


General
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Rotation angle (one-way slabs) or X direction (two way slabs)	This property is used for the following where appropriate: Span direction for 1-way load decomposition To determine the 2D solver element local axes in the solver model Bar direction for Slab on Beam and Flat Slabs. Different angles can be specified for different panels within the slab. Note: When SpanDirection is switched on in Scene Content, the rotation angle/X direction is represented by a blue arrow. See: Rotation angle for slab items and panels and Modify slab/panel span direction
Include in diaphragm	If this option is cleared, the slab item does not participate in diaphragm action. All nodes linked to the slab item will be able to displace independently of the diaphragm.
Override slab depth	By default all panels in a slab adopt the same depth. Checking this option allows the selected panel to have a different depth and vertical offset.
Vertical offset	Only available when ‘Override slab depth’ is checked. A positive offset raises the slab panel surface, a negative offset drops it. Note: Vertical offsets are not structurally significant
Auto-design	For slab items in Auto-design mode, As,prov is increased until either a pass is achieved or the limiting reinforcement parameter limits have been exceeded. For slab items not in Autodesign mode, the result will be a pass or fail.
Select bars starting from	This option controls the starting point for auto-design procedures.
Plane	Indicates the level at which the slab is placed.


Slab general
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Slab type	Slab on beams
Deck type	'Reinforced concrete', or 'Post tension'. 'Post tension' slabs can not be designed.
Decomposition	When the slab type is 'Slab on beams', decomposition can be either 'One-way' or 'Two-way'
Analyze slab	This option is only displayed for one-way decomposition slabs. When selected, the 1-way slab is enabled for finite element analysis in load decomposition, FE chasedown and optionally for 3D analysis. This option also activates additional Analysis parameters in the Slab Item properties to allow orthotropic properties to be specified. These parameters include a Y-factor defaulted to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). For further details, see: Define an orthotropic slab using relative stiffness factors


Slab parameters
Slab properties
Overall depth	Specifies the slab thickness.
Concrete type	• Normal • Lightweight
Concrete class [Eurocode], Grade[Other codes]	Specifies the concrete class [Eurocode], Grade[ Other codes].
Concrete density class	For normal weight concrete only, specifies the density class.
Dry density, Dry density per area	Specifies the dry concrete density and dry concrete density per area
Wet density, Wet density per area	Specifies the wet concrete density and wet concrete density per area
Diaphragm option	Sets the default diaphragm action for all slab items within the parent slab. Rigid Semi-rigid None
Analysis parameters Only displayed if 'Decomposition' is 'Two-way, (or 'One-way' with 'Analyze slab' also selected).
Orthotropic	By default, the slab item is treated as having isotropic material properties. Checking this option allows assigning orthotropic material properties. For further details, see: Orthotropic slabs
Calculate properties	Only available when ‘Orthotropic’ is checked. Allows setting material properties in two in-plane directions automatically based on the stiffness modification X and Y factors below. For details of how the parameters are calculated, see: Orthotropic slab implementation
X factor and Y factor	Only available when ‘Calculate properties’ is checked. Applies stiffness modification factors in the local X and Y directions For 1-way slabs the Y-factor defaults to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). Note: Applying the same stiffness modification factors in both directions is an alternative way of specifying stiffness adjustments of isotropic slab items.
Ex, Ey, Gxy, Gxz \| Gyz, 𝜈x, and 𝜈y	Allows manually setting material properties, such as Young’s moduli, shear moduli, and the Poisson’s ratio. The fields become editable when ‘Calculate properties’ is unchecked (except 𝜈y, which remains read-only). Note: No distinction is made between Gxz and Gyz out-of-plane shear moduli.
Apply modification factors	By default, the modification factors are applied. Unchecking this option ignores the modification factors for the slab item. See: Use of modification factors and Analysis settings
Design parameters
Permanent load ratio [Displayed for Eurocode only]	You are required to supply a value for the permanent load ratio parameter. A default of 0.65 has been assumed, but you are advised to consider if this is appropriate and adjust as necessary.
Maximum crack width [Not displayed for ACI/AISC Regional Code]	The maximum center to center bar spacing for crack control is dependent on the maximum allowable crack width that is specified here.
Deflection parameters
Restraint constant [Displayed for ACI/AISC Regional Code only]	See: Restraint constant (ACI)
Restraint type [Displayed for Eurocode only]	See: Restraint type (EC2)
Cement class [Displayed for Eurocode only]	See: Concrete Properties (Eurocode)


Design parameters
Adjustment ratio direction X ,Adjustment ratio direction Y (slab on beam only)	These factors are applied to the enclosing lengths in X and Y in order to manually adjust the X and Y direction span in the span-effective depth check. See Slab on beam idealized panels
Enclosing length X, Enclosing length Y (slab on beam only)	The automatically calculated span length in the X direction, and Y direction. See Slab on beam idealized panels
Adjusted length X, Adjusted length X (slab on beam only)	The adjusted span lengths in the X and Y directions. See Slab on beam idealized panels
Edge category start X, Edge category start Y (slab on beam only)	The assumed support condition at the start of the span in the X direction, and Y direction. See Slab on beam idealized panels
Edge category end X, Edge category end Y (slab on beam only)	The assumed support condition at the end of the span in the X direction, and Y direction. See Slab on beam idealized panels
Average stiffness ratio (Slab on beam ACI/AISC only)	In the current release of Tekla Structural Designer the average stiffness ratio is a user defined value. (Default value = 1.0). The way in which the minimum thickness is calculated directly depends on this value.


*Live [ACI/AISC], Imposed [Other codes]* Load Reduction**
Reduce live [ACI/AISC], imposed [Other codes] loads by	This property is applicable for the design of transfer slabs and mats. Although the percentage of live load reduction is not determined automatically, this property allows you to specify the percentage manually. It can be applied to an individual slab item - you don't have to apply a single value throughout a slab or mat (this can be important if you have discrete transfer panels within a large slab area). • reducible loadcases are reduced • combinations incorporating reducible loadcases are reduced • The reduced results are used in slab design. Note: For mats, the bearing pressures are reduced as well.


Reinforcement
Top bars, Bottom bars	Slabs panels can potentially have 4 layers of background reinforcement, (however any of the layers/directions can be set to “none” if required). Select/clear Outside layer in X direction as appropriate to indicate if the outside layer is in the X or Y direction. (The outside layer can be set differently for the top and bottom bars if required.)
Top cover, Bottom cover	Specifies the top and bottom cover to reinforcement.


Utilization ratio
Apply (to autodesign)	Selected - When an Autodesign is performed, the design will be incremented to achieve a utilization ratio less than the ratio limit. Unselected - When an Autodesign is performed, the design will be incremented to achieve a utilization ratio less than 1.0. See: Apply user defined utilization ratios
Apply (to check)	Selected - When a Check is performed, the check will pass provided the utilization ratio is less than the ratio limit. Unselected - When a Check is performed, the check will pass provided the utilization ratio is less than 1.0.
Ratio limit	The utilization ratio against which the autodesign or check is performed (when applied above).


All edges, Edge 1, Edge 2 etc.
Linear	Uncheck in order to specify curved edges.
Curvature	Defines the amount of curvature to all edges. Only displayed when Linear is cleared.


UDA
Name Finish Class Phase Note File	A customizable list of the attributes that can be applied to individual members and panels. See: Create and manage user-defined attributes

General properties


General
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Rotation angle (one-way slabs) or X direction (two way slabs)	This property is used for the following where appropriate: Span direction for 1-way load decomposition To determine the 2D solver element local axes in the solver model Bar direction for Slab on Beam and Flat Slabs. Different angles can be specified for different panels within the slab. Note: When SpanDirection is switched on in Scene Content, the rotation angle/X direction is represented by a blue arrow. See: Rotation angle for slab items and panels and Modify slab/panel span direction
Include in diaphragm	If this option is cleared, the slab item does not participate in diaphragm action. All nodes linked to the slab item will be able to displace independently of the diaphragm.
Override slab depth	By default all panels in a slab adopt the same depth. Checking this option allows the selected panel to have a different depth and vertical offset.
Vertical offset	Only available when ‘Override slab depth’ is checked. A positive offset raises the slab panel surface, a negative offset drops it. Note: Vertical offsets are not structurally significant
Plane	Indicates the level at which the slab is placed.


Slab general
Name	The automatically generated name for the slab item.
User Name	Can be used to override the automatically generated name if required.
Slab type	Slab on beams
Deck type	'General'.
Decomposition	When the slab type is 'General', decomposition can be either 'One-way' or 'Two-way'
Analyze slab	This option is only displayed for one-way decomposition slabs. When selected, the 1-way slab is enabled for finite element analysis in load decomposition, FE chasedown and optionally for 3D analysis. This option also activates additional Analysis parameters in the Slab Item properties to allow orthotropic properties to be specified. These parameters include a Y-factor defaulted to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). For further details, see: Define an orthotropic slab using relative stiffness factors


Slab parameters
Slab properties
Overall depth	Specifies the slab thickness.
Diaphragm option	Sets the default diaphragm action for all slab items within the parent slab. Rigid Semi-rigid None
Analysis parameters Only displayed if 'Decomposition' is 'Two-way, (or 'One-way' with 'Analyze slab' also selected).
Orthotropic	By default, the slab item is treated as having isotropic material properties. Checking this option allows assigning orthotropic material properties. For further details, see: Orthotropic slabs
Calculate properties	Only available when ‘Orthotropic’ is checked. Allows setting material properties in two in-plane directions automatically based on the stiffness modification X and Y factors below. For details of how the parameters are calculated, see: Orthotropic slab implementation
X factor and Y factor	Only available when ‘Calculate properties’ is checked. Applies stiffness modification factors in the local X and Y directions For 1-way slabs the Y-factor defaults to 0.01 in order to create a slab that performs in a highly 1-way manner (100 times weaker transverse to the intended span direction). Note: Applying the same stiffness modification factors in both directions is an alternative way of specifying stiffness adjustments of isotropic slab items.
Ex, Ey, Gxy, Gxz \| Gyz, 𝜈x, and 𝜈y	Allows manually setting material properties, such as Young’s moduli, shear moduli, and the Poisson’s ratio. The fields become editable when ‘Calculate properties’ is unchecked (except 𝜈y, which remains read-only). Note: No distinction is made between Gxz and Gyz out-of-plane shear moduli.
Apply modification factors	By default, the modification factors are applied. Unchecking this option ignores the modification factors for the slab item. See: Use of modification factors and Analysis settings
Material properties
Grade	Allows you to select the general material from the list of general materials in the materials database.
Override material properties	Select this option to define material properties directly instead of selecting from the database.


*Live [ACI/AISC], Imposed [Other codes]* Load Reduction**
Reduce live [ACI/AISC], imposed [Other codes] loads by	This property is applicable for the design of transfer slabs and mats. Although the percentage of live load reduction is not determined automatically, this property allows you to specify the percentage manually. It can be applied to an individual slab item - you don't have to apply a single value throughout a slab or mat (this can be important if you have discrete transfer panels within a large slab area). • reducible loadcases are reduced • combinations incorporating reducible loadcases are reduced • The reduced results are used in slab design. Note: For mats, the bearing pressures are reduced as well.


All edges, Edge 1, Edge 2 etc.
Linear	Uncheck in order to specify curved edges.
Curvature	Defines the amount of curvature to all edges. Only displayed when Linear is cleared.


UDA
Name Finish Class Phase Note File	A customizable list of the attributes that can be applied to individual members and panels. See: Create and manage user-defined attributes

Slab item properties

Slab item properties

Precast concrete slab item properties

Composite slab item properties

Flat slab properties

Slab on beams properties

General properties