Slab deflection settings

Tekla Structural Designer
2021
Tekla Structural Designer

Slab deflection settings

The Slab Deflection page and its sub pages allow you to control the slab deflection defaults applied to:

  • the current project - when accessed from Settings on the Slab Deflection ribbon tab.
  • new projects - when accessed from Settings on the Home tab.

Slab deflection settings when accessed from the Slab Deflection ribbon tab

Button, command, or option Description

New Load Event Defaults subpage

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 subpage

Deflection limit, L /

Allows you to define a default deflection limit to new checks added to the

When a new check is added to the Slab Deflection Check Catalogue it initially defaults to the deflection limit set here.

Aging, Creep & Shrinkage subpage

Allowance for shrinkage effects in total deflection

Allows you to define an amplification base factor for shrinkage.

Note:

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 subpage

Allows you to adjust the properties used for the different element types in the iterative cracked section analysis.

Iteractive Cracked Section Analysis subpage

Global Convergence Criteria

Allows you to modify the following options:
  • Maximum number of iterations: The number of iterations to perform. Default = 200.
  • Tolerance: At the end of each iteration, values are checked against the previous iteration results. If the difference is less than the tolerance determined here, the result is converged, and the analysis is complete. Default = 0.00100.
  • Relative: Default: ON.
Tip:
To resolve global convergence failures:
  • Increase the value in Maximum number of iterations.
  • Decrease the value in Tolerance.

Local Convergence Criteria

Allows you to modify the following options:
  • Maximum number of iterations: The number of iterations to perform. Default = 500.
  • Tolerance: At the end of each iteration, values are checked against the previous iteration results. If the difference is less than the tolerance determined here, the result is converged, and the analysis is complete. Default = 0.000001.
  • Smoothing Parameter: A property only available for the Eurocode head code. Default = 0.005.
Tip:
To resolve local convergence failures:
  • Increase the value in Maximum number of iterations.
  • Decrease the value in Tolerance.
  • If you are using the Eurocode head code, increase the value in Smoothing Parameter.

Slab deflection settings when accessed from the Home ribbon tab

Button, command, or option Description

New Load Event Defaults subpage

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 subpage

Deflection limit, L /

Allows you to define a default deflection limit to new checks added to the

When a new check is added to the Slab Deflection Check Catalogue it initially defaults to the deflection limit set here.

Aging, Creep & Shrinkage subpage

Allowance for shrinkage effects in total deflection

Allows you to define an amplification base factor for shrinkage.

Note:

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.

Load Event Sequence subpage

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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