3.1.3 1.1.1 Detaily

1.1.1 Detaily

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.

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 k_t 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. U kombinací zatížení a výsledků se udávají i všechny obsažené zátěžové případy.

Tento sloupec upravuje, které zatěžovací stavy mají být použity jako trvalá zatížení. If an entry is marked (selected check box), the factor k_t is automatically set to 0.4 in the next column.

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

$k_t = \frac{{\displaystyle \sum _{i=1}^n}{\gamma }_i \left(\text{LF}\right) · k_{t,i} \left(\text{LF}\right)}{{\displaystyle \sum _{i=1}^n}{\gamma }_i \left(\text{LF}\right)}$