Section 2 Longitudinal Deck Girders

201. Section modulus

1. The section modulus of longitudinal deck girders outside the lines of hatchway openings of strength deck of midship part is not to be less than obtained from the following formula:

Ě Ņ ÌǾĪĶ ᾎᾜᾨĪ (cm3)

where:

ᾎ = Distance between the centres of two adjacent spans of beams supported by the girders or the beam bracket (m)

h = Deck loads specified in Ch 10, Sec 2 (kN/m2)

l = Distance between the supports of longitudinal girders (m)

2. Beyond the midship part of barge, the section modulus of longitudinal deck girders outside the lines of openings of strength deck, may be gradually reduced, but the section modulus is not to be less than obtained from the following formula:

Ě Ņ LǾĨKĨ ᾎᾜᾨĪ (cm3)

ᾎ, h and l : As specified in Par 1.

3. The section modulus of longitudinal deck girders for the parts other than specified in Par 1 and 2,

is not to be less than obtained from the formula in Par 2.

202. Thickness of web plates

The thickness of web plates is not to be less than obtained from the following formula:

ᾼ Ņ ÌL ĊÌ Ñ ÌǾJ (mm)

where:

ĊÌ = Spacing of web stiffeners or depth of the girders (m), whichever is the smaller