Section 3 Longitudinal Beams

301. Spacing

The standard spacing of the longitudinal beams is obtained from the following formula:

Ċ Ņ Ī Ã Ñ JJL (mm)

302. Proportion

1. Longitudinal beams are to be supported by deck transverses of appropriate spacing. In midship part of strength deck, the slenderness ratio of deck longitudinals is not to exceed 60. This requirement may, however, be suitably modified where longitudinal beams are given a sufficient strength to pre- vent buckling.

2. Flat bars used for longitudinals are not to be of depth thickness ratio exceeding 15:

303. Section modulus

1. The section modulus of longitudinal beams outside the line of openings of strength decks for the midship part of barge is not to be less than obtained from the following formula:

Ě Ņ ÌǾÌĨ ĊᾜᾨĪ (cm3)

where :

Ċ = Spacing of longitudinal beams (m)

h = Deck load specified in Sec 2 (kN/m2)

l = Horizontal distance between bulkhead and deck transverse or between deck transverses (m)

2. Beyond the midship part of barge, the section modulus of longitudinal beams outside the line of openings on strength decks may be generally reduced, but the section modulus is not to be less than obtained from the following formula:

Ě Ņ LǾĨĮ ĊᾜᾨĪ (cm3)

where :

Ċ, h and l : As specified in Par 1.

3. The section modulus of longitudinal beams, except where specified in Par 1 and 2, is not to be less than obtained from the formula in Par 2.

304. Deck transverse supporting longitudinal beams

Deck transverse supporting longitudinal beams are to be provided in line with the solid floors.