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在石拱桥的设计上,多是由拱圈断面中砂浆的拉应力来控制,亦就是由断面中轴向力的偏心距来控制。例如:跨径l_o=15米,矢跨比f_o/l_o=1/3,净宽7米(附2×0.75米人行道),设计载重用汽-18、拖-80,拱圈厚度d_o=80厘米,采用80号水泥砂浆砌拱圈,其允许拉应力〔σ_p〕=16吨/平方米。计算得当拖-80作用在拱顶时,拱顶断面中的内力M=4.861吨一来.N=34.899吨,平均计算应力σc_p=N/d_o=
In the design of stone arch bridge, it is mostly controlled by the tensile stress of the mortar in the arch ring section, that is, the eccentricity of the axial force in the section. For example: span l_o = 15 m, sag ratio f_o / l_o = 1/3, net width of 7 m (with 2 × 0.75 m sidewalks), design load steam -18, drag -80, arch thickness d_o = 80 Cm, using 80 cement mortar arch ring, which allows the tensile stress 〔σ_p〕 = 16 tons / square meter. Calculated when the drag -80 role in the vault, the arch section of the internal force M = 4.861 tons of one. N = 34.899 tons, the average calculated stress σc_p = N / d_o =