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Lloyd's Register Rules and Regulations - Rules and Regulations for the Classification of Inland Waterways Ships, July 2022 - Part 4 Ship Structures (Ship Types) - Chapter 9 Passenger Ships - Section 9 Deck structure

Section 9 Deck structure

Parent topic: Chapter 9 Passenger Ships

9.1 Deck supporting structure

9.1.1 The transverse and longitudinal deck supporting structure is to comply with the requirements of Table 9.9.1 Deck supporting structure.

Table 9.9.1 Deck supporting structure

Item Modulus
Transverse deck beams ZTD = 4,3ksle2h1 + 4 cm3
Transverse beams in way of crown of tank Z TDCT = 4,3ksle2h2 + 4 cm3
Deck longitudinals Z DL = 4,3ksle2h1 + 4 cm3
Deck longitudinals in way of crown of tank ZDLCT = 4,3ksle2h2 + 4 cm3
Item Parameter Requirements
Girders and transverses in dry spaces Modulus Z = 4,75kh1Sle2 cm3
Pillars in dry spaces, see Note Inertia I = leZ cm4
  Cross sectional area of all types of pillars
  Minimum wall thickness of hollow pillars The greater of:
    (a) t = 0,033dρ mm for tubular pillars
    t = 0,056b mm for square pillars
    (b) t = 5 mm
Symbols
L, s, S, Z, I, k and t as defined inPt 4, Ch 9, 1.14 Symbols and definitions 1.14.1
b = breadth of side of a hollow rectangular pillar, in mm
dρ = mean diameter of tubular pillars, in mm
h1 = head, in metres, as defined in Pt 3, Ch 3, 4 Design loading
h2 = load head, in metres, measured vertically from the middle of effective length to a point 1 m above the top of tank, or to top of the overflow, whichever is the greater
I = overall length of pillar, in metres
le = effective length of stiffening member, in metres, but is to be taken not less than 3 m
r = least radius of gyration of pillar cross-section, in mm, and may be taken as:
r =
Aρ = cross-sectional area of pillar, in cm2
Iρ = least moment of inertia of cross-section, in cm4
P = load supported by the pillar, in tonne-f

Note For deck supporting structure in tanks, see also Pt 3, Ch 7 Bulkheads.

9.1.2 Deck girders and transverses may be fitted in conjunction with load bearing bulkheads or pillars for support of deck beams or deck longitudinals.

9.1.3 Load bearing bulkheads or webs are to be fitted below the deck in line with web stiffeners supporting erection bulkheads.

9.1.4 Effective arrangements are to be made to distribute the load at the heads and heels of all pillars. Tripping brackets or equivalent are to be fitted to the transverse or girder web plates in way of pillars. Where eccentric loads are to be supported, the pillars are to be strengthened for the additional bending moment imposed upon them.

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