A - gross cross-sectional area; An-- net cross-sectional area; Height H-- column; H1, H2, H3-- stepped column, middle (or single-stage column next paragraph), the height of the lower section; I - hair-sectional moment of inertia; It-- Mao sectional torsional moment of inertia; Iw-- hair-sectional moment of inertia of the fan; In-- net section moment of inertia; S - gross moment of area; W - Gross section modulus; Wn-- net section modulus; Wp-- gross plastic section modulus; Wpn-- plastic net section modulus; ag - spacing gap; Free b-- plate or sheet width outrigger width; bo-- box section flange plate in unsupported web width between; concrete slab width of the top bracket; bs-- stiffener extended width; Effective width be-- board member; d - diameter; de-- effective diameter; do-- aperture; e - eccentricity; h - cross section of full height; floor height; Hc1-- thickness of the concrete slab; hc2-- torr concrete slab thickness; He-- calculating the thickness of the fillet weld; hf-- fillet weld leg size; hω-- web height. Ho-- calculate the height of the web; i - sectional radius of gyration; l - length or span; ll-- beam compression flange distance between the lateral support; bolts (or rivets) to connect the length direction of the force; lo-- bending buckling effective length; lω-- torsional buckling length calculation; lw-- calculate the length of the weld; lz-- concentrated load calculations assume that the distribution of the length of the height of the edge of the web; s-- partial penetration butt weld groove to the root of the weld surface of the shortest distance; Competent wall thickness; thickness t-- plate; ts-- stiffener thickness; Tw-- web thickness; α - angle; θ - angle; stress diffusion angle; γb-- beam web thickness ratio by the general calculation of bend; γs-- beam web thickness ratio by the general calculation of shear; γc-- beam web thickness ratio that is common when the partial pressure calculation; γ - slenderness ratio; γo, γyz, γz, γuz-- conversion slenderness ratio,
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