公式 16

\begin{array}{l} b_{2, eff} = ρ_{2} \cdot c_{2} = 0.262 \cdot 2, 487.5 = 650.7 mm \\ b_{2, edge, eff} = 0.5 \cdot b_{2, eff} = 0.5 \cdot 650.7 = 325.4 mm \\ b_{2, \sup, eff} = 0.5 \cdot b_{2, eff} = 0.5 \cdot 650.7 = 325.4 mm \end{array}

您有什么问题想问的吗？