方钢的承重计算公式是什么

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1,方25x1.5,25,1.5,131,11600（即：方25x1.5：边长25,壁厚1.5，截面面积A=131mm2；惯性矩I=11600mm4；截面模量W=I*2/H=928mm3；回转半径i=根下(I/A)=9.4mm；单位重量:A*0.00785=1.028Kg/m)2,方30x1.5,30,1.5,161,211003,方40x1.5,40,1.5,221,533004,方40x2.0,40,2,287,666005,方50x1.5,50,1.5,281,1082006,方50x2.0,50,2,367,1371007,方60x2.0,60,2,447,2451008,方60x2.5,60,2.5,548,2936009,方80x2.0,80,2,607,60580010,方80x2.5,80,2.5,748,73400011,方100x2.5,100,2.5,948,147910012,方100x3.0,100,3,1125,173120013,方120x2.5,120,2.5,1148,260880014,方120x3.0,120,3,1365,306710015,方140x3.0,140,3,1605,495680016,方140x3.5,140,3.5,1858,568220017,方140x4.0,140,4,2107,637970018,方160x3.0,160,3,1845,749640019,方160x3.5,160,3.5,2138,861340020,方160x4.0,160,4,2427,969350021,方160x4.5,160,4.5,2712,1073660022,方160x5.0,160,5,2993,11744400

1,方25x1.5,25,1.5,131,11600（即：方25x1.5：边长25,壁厚1.5，截面面积A=131mm2；惯性矩I=11600mm4；截面模量W=I*2/H=928mm3；回转半径i=根下(I/A)=9.4mm；单位重量:A*0.00785=1.028Kg/m)
2,方30x1.5,30,1.5,161,21100
3,方40x1.5,40,1.5,221,53300
4,方40x2.0,40,2,287,66600
5,方50x1.5,50,1.5,281,108200
6,方50x2.0,50,2,367,137100
7,方60x2.0,60,2,447,245100
8,方60x2.5,60,2.5,548,293600
9,方80x2.0,80,2,607,605800
10,方80x2.5,80,2.5,748,734000
11,方100x2.5,100,2.5,948,1479100
12,方100x3.0,100,3,1125,1731200
13,方120x2.5,120,2.5,1148,2608800
14,方120x3.0,120,3,1365,3067100
15,方140x3.0,140,3,1605,4956800
16,方140x3.5,140,3.5,1858,5682200
17,方140x4.0,140,4,2107,6379700
18,方160x3.0,160,3,1845,7496400
19,方160x3.5,160,3.5,2138,8613400
20,方160x4.0,160,4,2427,9693500
21,方160x4.5,160,4.5,2712,10736600
22,方160x5.0,160,5,2993,11744400

计算公式：  4x壁厚x(边长-壁厚)x7.85  
其中，边长和壁厚都以毫米为单位，直接把数值代入上述公式，得出即为每米方管的重量，以克为单位。  
如30x30x2.5毫米的方管，按上述公式即可算出其每米重量为：  
4x2.5x(30-2.5)x7.85=275x7.85=2158.75克，即约2.16公斤  
当壁厚和边长都以毫米为单位时，4x壁厚x(边长-壁厚)算出的是每米长度方管的体积，以立方厘米为单位，再乘以铁的比重每立方厘米7.85克，得出即为每米方管以克为单位的重量。