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TDA setup

These values must be set for the TDA.

Load factors

gamma-creep min(<=1); gamma-creep max(>=1)

These parameters, that are common for all construction and service stages, can be specified for generated creep load-cases. In fact, no load factors will be applied in TDA calculations. Therefore the results of creep load-cases that are generated by TDA will also have no load factors included in themselves (better said load factor = 1.0). After the calculation has been performed, both SLS and ULS combinations are generated. For ULS combinations all factors (gamma min and gamma max) for dead load, prestressing, quasi-permanent load, and creep will be applied using both their maximum and minimum values.

Generate output text file

If this checkbox is ticked, a temporary output text-file is generated in the directory for analysis data and temporary files.

Time history

Number of subintervals

The number of subintervals on the detail time axis. The subintervals following the first time subinterval are generated in log scale. This parameter has an impact on the accuracy of solution of concrete creep.

See also Time axis.

Ambient moisture

Ambient moisture in percentages.

Beam history

Each member has it’s own history of in local time axis containing e.g. time of casting, end of curing, etc. All data set in the setup dialog are related to local time axis of relevant 1D member. The origin of the local time axis (zero time) is set to the time, when the appropriate stiffness of macro is introduced (added) into global stiffness matrix of the whole structure ("birth of member"). The relevant member in highlighted in a special colour in the drawing in main graphic window. The origin of local time axis is then located to global time of current construction stage.

Time of casting

Time of casting of concrete in days. It is possible to input negative value. In such case the stiffness of the elements between the time of casting and the birth of macro (zero local time) is not included into global stiffness matrix. At the same time the age of concrete elements is correct.

Time of curing

Time of curing of concrete in days. In case of "phased cross-section" it is time of curing of concrete of phase one in days.

Time of curing of composite parts of cross-section

Significant only in case of "phased cross-section". It is the time of curing of concrete of the second phase (of composite parts) in days. This input value is in fact the duration of curing of concrete composite parts of the cross-section – it is related to the local time axis of the composite part.

Line support (formwork)

The age of concrete is respected when calculating its modulus of elasticity. At early stages the fresh concrete should be properly supported by formwork (centring). It is therefore possible to define line support of 1D member.

Time of releasing of displacements in X direction,

Time of releasing of displacements in Z direction

Self-explanatory. X, Z are axes of global co-ordinate system.
Procedure to adjust TDA parameters

  1. Open the service Construction stages.

  2. Start function Setup.

  3. Input the required parameters.

  4. Confirm with [OK].

  5. Close the Setup dialogue.

Note: The TDA part of the setup dialogue is available ONLY if TDA module is available, i.e. if e.g. the project is of Frame XZ type.

 

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