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钢桁架重量可表示为:w=r/σ{sum S_sl_s/φ_s+sum S_cl_c+sum S_(fa)l_(fa)/φ_(fa)+sum S_(fl)l_(fl)} 式中:S_s、S_c、S_(fa)、S_(fl)分别为上弦杆、下弦杆、受压腹杆和受拉腹杆的内力;l_s、l_c、l_(fa)、l_(fl)分别为上弦杆、下弦杆、受压腹杆和受拉腹杆的长度;φ_s、φ_(fa)分别为上弦杆和受压腹杆的稳定系数;r为钢材容重;σ为钢材容许应力。故桁架的重量取决于各杆内力、数量、长度,以及受压杆的断面选择和
The steel truss weight can be expressed as: w=r/σ{sum S_sl_s/φ_s+sum S_cl_c+sum S_(fa)l_(fa)/φ_(fa)+sum S_(fl)l_(fl)} where: S_s S_c, S_(fa), and S_(fl) are the internal forces of the upper chord, the lower chord, the compressed abdominal rod, and the pull-abdominal rod; l_s, l_c, l_(fa), and l_(fl) are the top chords, respectively. The lengths of the lower chord, the compressed abdominal web and the tensioned web members; φ_s, φ_(fa) are the stability coefficients of the upper chord and the pressed web members respectively; r is the steel bulk density; σ is the steel allowable stress. Therefore, the weight of the truss depends on the internal forces, the number, the length of the rods, and the section selection of the compressed rods.