Action > FibIISup

The actions FibIILc and FibIISup perform a fiber stress check for a cracked concrete section. In FibIISup it is possible to specify different envelopes for checking if the section is cracked (1^st envelope) and for calculating the stresses in the cracked state (2^nd envelope).

If any stress in uncracked concrete exceeds the tensile stress limit (stress limit I), a linear ultimate load check is started. This check uses a linear stress-strain curve (modulus of elasticity) within the input stress limit II. The tensile stress in concrete is set to zero. The number of the stress limit pair used for comparison of the actual stresses in order to detect stresses exceeding of the allowable level, is specified in Input2. A 2^nd stress limit pair (maybe the same) must be specified for performing the equilibrium calculation in the cracked section (only the compression limit used, the tensile limit is always set to zero in this context). The pre-stressing load case must be specified if the relevant primary state is not included in the summation load case or considered envelope.

If the option Rein is set, a reinforcement design procedure will be performed if necessary, i.e. if no equilibrium can be achieved without additional reinforcement.

Setting	Description
Action	Code of the selected Action. It is possible to switch to another action without leaving and re-entering the input function.
Action will be skipped (Option)	The action will be skipped in the calculation process if the option is selected.
Input-1 > Superposition file name 1	Name of the superposition file, for which the concrete stress check has to be done. First the stress check (State I) will be done for superposition file 1. Only if any stress in concrete exceeds the tensile stress limit I, a (State II) ultimate load check for superposition file 2 will be done (accepted limit II).
Input-1 > (Superposition file name 2)	Optional entry. Name of the superposition file, which has to be checked for cracked concrete stress limit. If the superposition file 2 is not set, cracked concrete fiber stress check/ reinforcement design is done with superposition file 1.
Input-2 > No. stress limit I	Number of stress limit pair of the concrete, which represents the allowable stress (tensile strength) of uncracked concrete. Note: The calculated uncracked stresses are compared with the respective tensile limit. A check for cracked concrete is only done if this limit is exceeded.
Input-2 > No. stress limit II	Ordinal number of the stress limit pair used for cracked concrete analysis.
Input-2 > (Initial strain loadcase)	Optional entry. Name of the load case, which is used to calculate the initial strain of the tendons. (Translation in stress-strain curve for the proof check) Note: If * is entered the program takes the initial tendon strains from superposition 1, if empty (default), from the summation load case specified in the recalc pad.
Input-3 > (Rein)	If this option is selected, a reinforcement design will be done. It is done for elements, where the stresses, calculated by cracked concrete analysis, exceed the stress limit II.
Output-1 > (Superposition file)	Optional entry. Name of a superposition file, whereto the calculated strain plane of cracked concrete shall be stored. This allows for a later check of this superposition file in the GUI or list or plot files. Note: The superposition file must exist (SupInit ).
Output-2 > List File	Name of list file, whereto results of fiber stress check/ reinforcement design will be written. Default input '*' automatically generate a list file name: - "fibi"+load case name+".lst", if a fibre stress check is done. - "fibr"+load case name+".lst", if a reinforcement design (Option: Rein) is done. Example: Load case name "SLS" generates list files fibiSLS.lst or fibrSLS.lst If there is no input, no list file will be created.
Delta-T	Duration of the Action (not applicable for this action)
Description	Descriptive text for the selected Action (max. 80 characters)

Note: This Action is not affected by the selected standard.