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This tab appears when load cases are selected for the serviceability limit state design and the standard EN 1992-1-1 or ACI 318-14 is set.
In the crack width design, the program calculates the differences in the mean strains of concrete and reinforcing steel (see chapter 188.8.131.52). According to EN 1992-1-1, 7.3.4 (2), Eq. (7.9), the load duration factor kt must be specified for these differences.
This column lists all load cases, load combinations, and result combinations that have been selected for design in the Serviceability Limit State tab. For load and result combinations, the included load cases are shown, too.
This column indicates the load cases that will be applied as permanent loads. If an entry is selected (check box is selected), the factor kt is automatically set to 0.4 in the final column.
The load duration factor kt is used to consider the duration of the load. The factor kt is 0.4 for long-term load actions and 0.6 for short-term actions.
For load and result combinations, the mean is taken from the kt values of the load cases contained in the CO or RC.