Characteristic Post-Cracking Flexural Tensile Strength

{f^{f}}_{cflk, Li} = e^{({Lf}^{f}_{cflm, Li} - k_{s} \cdot L_{s})} \leq 0.51 \cdot {f^{f}}_{cflm, Li}

Lf^f_cflm,Li	Mean value of the logarithmized single test results f^f_cfl,Li,j (for details, see [1])
L_s	Standard deviation of the logarithmized single test results (for details, see [1])
k_s	Fractile correction factor for unknown standard deviations for the 5% fractile with 75% confidence level (for details, see [1])

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