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$$C_1=3.1055-3.4287\cdot\left(\cfrac{a}{H}\right)+0.8522\cdot\left(\cfrac{a}{H}\right)^2$$

$$C_2=-1.4370+10.5053\cdot\left(\cfrac{a}{H}\right)-8.7547\cdot\left(\cfrac{a}{H}\right)^2-19.6273\cdot\left(\cfrac{a}{H}\right)^3$$

$$C_3=-1.6753-14.0851\cdot\left(\cfrac{a}{H}\right)+43.6575\cdot\left(\cfrac{a}{H}\right)^2$$

$$C_4=1.7207+5.7974\cdot\left(\cfrac{a}{H}\right)-27.7463\cdot\left(\cfrac{a}{H}\right)^2+6.0444\cdot\left(\cfrac{a}{H}\right)^3$$

$$K_{tn}=C_1+C_2\cdot\left(\cfrac{a}{b}\right)+C_3\cdot\left(\cfrac{a}{b}\right)^2+C_4\cdot\left(\cfrac{a}{b}\right)^3$$

$$σ_{nom}=\cfrac{P}{h\cdot d}$$

$$σ_{max}=K_{tn}\cdot σ_{nom}$$

$$σ=\cfrac{P}{h\cdot H}$$

$$K_{tg}=\cfrac{σ_{max}}{σ}$$