Slab deflection settings
The Slab Deflection page and its sub pages allow you to control the slab deflection defaults applied.
- in the current project - when accessed by clicking
- in new projects - when accessed by clicking
New Load Event Defaults
Setting | Description |
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Start time offset |
Allows you to define a default start time offset value for new event load start times. The value of a new event load start time is always the previous event start time + the default start time offset. |
Construction load |
Allows you to define a default value for new construction loads. Note:
The default construction load value depends on the head code that you are using. |
New Check Defaults
Setting | Description |
---|---|
Deflection limit, L / |
When a new check is added to the Slab Deflection Check Catalogue it initially defaults to the deflection limit set here. |
Aging, Creep & Shrinkage
Setting | Description |
---|---|
Allowance for shrinkage effects in total deflection |
Allows you to define an amplification base factor for shrinkage. The value must be within the range from 0.1 to 0.9. |
Aging Coefficient |
Allows you to select between 2 creep/aging methods: User defined and Automatic. Note:
The Aging Coefficient option is only available for the US head code. |
Modification factors
Note: This sub-page
is only displayed when the dialog box is accessed from the
Slab Deflection ribbon.
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Different factors can be applied for each of the different materials in the model in order to adjust the following properties: |
|
E |
Young's modulus |
G |
Shear modulus |
Itorsion |
Section inertia about local X |
Imajor |
Section inertia about local Y |
Iminor |
Section inertia about local Z |
Area |
Section area in compression or tension |
Aparallel to minor |
Section shear area in local Y |
Aparallel to major |
Section shear area in local Z |
t |
shell thickness (applicable to concrete only) |
The factors also vary according to the member types, (and in the case of concrete members whether they are cracked or not). For concrete members in particular, design codes can require that analysis stiffness adjustment factors are applied since the appropriate properties to use in analysis are load and time dependent. |
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Note: Although
default modification factors for each material are provided in
the settings sets to reflect the design code being worked to,
you should check that these are appropriate for your particular
analysis model. If you make changes to any of the modification
factors, analysis must be repeated.
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Iterative Cracked Section Analysis
Setting | Description |
---|---|
Note: This sub-page
is only displayed when the dialog box is accessed from the
Slab Deflection ribbon.
|
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Global Convergence Criteria |
Allows you to
modify the following options:
Tip:
To resolve
global convergence failures:
|
Local Convergence Criteria |
Allows you to
modify the following options:
Tip:
To resolve
local convergence failures:
|
Load Event Sequence
This sub-page is only displayed when accessed from Settings on the Home tab. It allows you to modify the global event sequence according to your needs. |
Tip: The
global event sequence provides the basis for the model event
sequence that you can modify, whereas the model event sequence
provides the basis for a submodel event sequence that you can
modify.
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