W310x129

W: Thickness of web, mm.	B: Width of flange , mm.	D: Deppth of section, mm	T: Thickness of flange, mm.
W: 13.1	B: 308	D:318	T: 20.6
BT: Width-to-thickness ratio .	HW: Depth-to-thickness ratio of web.	K: Distance between outer face of flange and web-toe of fillet, mm.	K1: Distance between middle line of web and flange-toe of fillet, mm.
BT: 7.48	HW: 21.1	K: 42	K1: 27
Dn_i: Nominal depth of section (Imperial units), in.	Dnom: Nominal depth of section, mm.	Mass: Mass per length, kg/m.	Wt_i: Weight per length (Imperial units), lb/ft.
Dn_i: 12	Dnom: 310	Mass: 129	Wt_i: 87
A: (Cross-sectional area, mm^2)	J: St-Venant torsional constant, mm^4.	Cw: Warping constant, mm^6.	Sw: Warping statical moment, mm^4.
A: 16500	J: 2130	Cw: 2220	Sw: 36.3
Ix: Moment of inertia about axis XX, mm^4.	Sx: Elastic section modulus about axis XX, mm^3.	Rx: Radius of gyration about axis XX, mm.	Sw: Plastic modulus about axis XX, mm^3.
Ix: 308	Sx: 1940	Rx: 137	Zx: 2160
Iy: Moment of inertia about axis YY, mm^4.	Sy: Elastic section modulus about axis YY, mm^3.	Ry: Radius of gyration about axis YY, mm.	Zy: Plastic modulus about axis YY, mm^3.
Iy: 100	Sy: 652	Ry: 78	Zy: 991
Qf: Statical moment at point in flange in line with web face, mm^3.	Qw: Statical moment at mid-depth in web, mm^3.	SA: Surface area per metre, m.	Section: Structural Member
Qf: 452	Qw: 1070	SA: 1.84	Section: W310x129

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