RF-CONCRETE Surfaces – Online Manual Version 5

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RF-CONCRETE Surfaces – Online Manual Version 5

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3.1.3 Details

Details

This tab appears when load cases have been selected for the serviceability limit state design and the standard EN 1992-1-1 or ACI 318-14 is set.

Figure 3.15 Window 1.1 General Data, Details tab

In the crack width design, the program calculates the differences in the mean strains of concrete and reinforcing steel (see chapter 2.6.4.12). According to EN 1992-1-1, 7.3.4 (2), Eq. (7.9), the load duration factor kt must be specified for this.

Load Case / Combination Description

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 as well.

Permanent Load

This column indicates the load cases that are to be applied as permanent loads. If an entry is marked (selected check box), the factor kt is automatically set to 0.4 in the next column.

Factor kt

The load duration factor kt is used to consider the load duration. 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 formed from the kt values of the load cases contained in the CO or RC.

kt = i=1nγi LF · kt,i LFi=1nγi LF