Section 19 Stiffness and Proportions

1. plate panels
   
2. Stiffener web plate
   
3. flange/face plate
   

Where:

s plate breadth, in mm, taken as the spacing between the stiffeners

t_net net thickness of plate, in mm

d_w gross depth of stiffener web, in mm, as given in Table 1.19.1 Slenderness Coefficients

t_w-net net web thickness, in mm

b_f-out gross breadth of flange outstands, in mm, as given in Table 1.19.1 Slenderness Coefficients

t _f-net net flange thickness, in mm

C, C_w, C_f slenderness coefficients, as given in Table 1.19.1 Slenderness Coefficients

σ_yd specified minimum yield stress of the material, in N/mm²

Table 1.19.1 Slenderness Coefficients

Item		Coefficient
Plate panel, C	Hull envelope and tank boundaries	100
	Other structure	125
Stiffener web plate, Cw	Angle and T profiles	75
	Bulb profiles	41
	Flat bars	22
Flange/face plate, Cf see Note 1	Angle and T profiles	12
Note 1. The total flange breadth, b f, for angle and T profiles is not to be less than: bf = 0.25dw Where: tnet net thickness of plate, in mm dw gross depth of web plate, in mm tw-net net web thickness, in mm bf-out gross breadth of flange outstands, in mm tf-net net flange thickness, in mm