Section 2 Minimum Thickness of Deck Laminates

201. Thickness of Deck Laminates of Single Skin Construction

1. The thickness of upper deck laminates for midship part in case where longitudinally framed, is not to be less than obtained from the following formula:

ᾼ Ņ ĨǾKĊΡ̓Üᾜ Nmm Ń

where,

Ċ : Spacing of longitudinal beams (m )

ᾜ : As specified in 203. (kNÕmĪ)

2. The thickness of upper deck laminates for midship part in case where transversely framed, is not to be less than obtained from the following formula:

ᾼ Ņ JǾKÌĊΡ̓Üᾜ Nmm Ń

where,

Ċ : Spacing of longitudinal beams (m )

ᾜ : As specified 203. (kNÕmĪ)

3. The thickness of upper deck laminates except for midship part and that of other deck laminates are not to be less than obtained from the following formula:

ᾼ Ņ ĨǾĪĊΡ̓Üᾜ Nmm Ń

where,

Ċ : Spacing of longitudinal beams or transverse beams (m )

ᾜ : As specified in 203. (kNÕmĪ)

202. Thickness of Deck Laminates of Sandwich Construction

1. The aggregated thickness of inner laminates, outer laminates and cores of sandwich construction is not to be less than obtained from the following formulae, whichever is greater:

ᾼÌ Ņ LǾÌǼÌĊᾜ Nmm Ń

ᾼĪ Ņ ǼĪᾼᾚ Nmm Ń

where,

ᾼᾚ : Thickness of deck laminates in case of single skin construction specified in 201. (mm )

Ċ : Spacing of longitudinal beams of transverse beams (m )

ᾜ : As specified in 203. (kNÕmĪ)

ǼÌ and ǼĪ : As specified in Ch 6, 303.

2. The respective thickness of the inner laminates and outer laminates of decks of sandwich con- struction are not, notwithstanding the requirements in the preceding 1, to be less than obtained from the following formulae. In no case, however, is it to be less than 2.4 mm .

ᾼ Ņ LǾÌKΡ̓Į

Ĩ

ÜǼ NĊᾜ ŃĨ

Nmm Ń

where,

Ċ : Spacing of longitudinal beams of transverse beams (m )

ᾜ : As specified in 203. (kNÕmĪ)

ǼĨ : As specified in Ch 6, 303.

203.

Deck Load ᾜ 【See Guidance】

1. Deck load ᾜ for decks intended to carry cargoes, etc. is to be as specified in the following:

(1) For decks intended to carry cargoes and stores,

ᾜ is to be 0.7 times the tween deck height at

side in metres from the deck to the deck immediately above it (kNÕmĪ) or cargo weight per unit area of the deck (kNÕmĪ), whichever is greater.

(2) Where cargoes are intended to be carried on the weather deck, ᾜ is to be cargo weight per unit area of the deck (kNÕmĪ) or the value stipulated in the following 3, whichever is greater.

(3) For decks intended to carry cargoes whose weight is considerably light,

modified.

2. For decks exclusively used for accommodation or navigation spaces and for houses, ᾜ is to be 4.5 (kNÕmĪ).

3. For weather decks, ᾜ is to be as specified in the following (1) and (2).

ᾜ may be suitably

tops of long deck-

(1) For weather decks afore 0.3 Ã

(2) For weather decks abaft 0.3 Ã

from the fore end : 0.50 Ã + 4.5 (kNÕmĪ ) from the fore end : 0.26 Ã + 4.5 (kNÕmĪ)