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This tab appears when load cases or combinations are selected for the serviceability limit state design, and the analysis is performed according to EN 1992-1-1. There is no need to display this tab for DIN 1045-1 because the factor kt is specified as 0.4 in Eq. (136).
In the crack width design, the program calculates the differences in the mean strains of concrete and reinforcing steel (see chapter 2.2.4). According to EN 1992-1-1, 7.3.4 (2), Eq. (7.9), the load duration factor kt must be specified for this.
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 to be applied as permanent loads. When selecting an entry, the corresponding factor kt is automatically set to 0.4 in column C.
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.
Equation 3.1 Load duration factor kt
This column is displayed if the analysis of Deflection ul,z is set in window 1.6 (see Figure 3.38). The factor β is 1.0 for short-term loading and 0.5 for long-term loading.