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B: Local Static Loads [Table of Contents] D: Local Requirements to Simple Girders

DNV-OS-C102 Structural Design of Offshore Ships

[-] Sec.6: Strength of Topside Structures
[-] C: Local Requirements to Plates and Stiffeners

Sec.6
C. Local Requirements to Plates and Stiffeners

Sec.6
C 100   Plates

Sec.6 C
101   The plate thickness shall not to be less than:

raster

f1 = see DNV Rules for Classification of Ships Pt.3 Ch.1 Sec.2 
tk == corrosion addition according to the Ship Rules, Pt.3 Ch.1 Sec.2 Table D1
0 for elements which are not part of a tank 



Sec.6 C
102   The thickness of plating subjected to lateral pressure shall not be less than:

raster

ka = correction factor for aspect ratio of plate field, (1.1 - 0.25 s/l)2
maximum 1.0 for s/l = 0.4
minimum 0.72 for s/l = 1.0 
s = stiffener spacing in m 
l = stiffener span in m 
p = local design load in B 
hP = permissible utilisation factors as given in I 
fy = specified minimum yield stress of the material in N/mm2 

Sec.6
C 200   Stiffeners

Sec.6 C
201   The section modulus for longitudinals, beams, frames and other stiffeners subjected to lateral load shall not be less than:

raster

l = stiffener span in m 
s = stiffener spacing in m 
p = local design load in B 
km = bending moment factor, see DNV Rules for Classification of Ships Pt.3 Ch.1 Sec.3 Table B1 
hP = permissible usage factors as given in I 
fy = specified minimum yield stress of the material in N/mm2 



Sec.6 C
202   The requirement in 201 applies to an axis parallel to the plating. For stiffeners at an oblique angle with the plating, the required section modulus shall be multiplied by:

raster

j = angle in degrees 1) between the stiffener web plane and the plane perpendicular to the plating 
  1. j is to be taken as 90 degrees if the angle is greater or equal to 75 degrees.
 



Sec.6 C
203   Stiffeners with sniped ends may be accepted where dynamic stresses are small and vibrations are considered to be of minor importance, provided that the plate thickness t supported by the stiffener is not less than:

raster

In such cases the required section modulus in 201 shall be based on the following parameter values:

km = 8

Sec.6
C 300   Green sea loads

Sec.6 C
301   Topside members exposed to green sea loads shall be checked according to the DNV Rules for Classification of Ships Pt.3 Ch.1 Sec.9 with the design loads given in Sec.11 and Sec.12.
B: Local Static Loads [Table of Contents] D: Local Requirements to Simple Girders