Design Head

The design head for side and end bulkhead plating and stiffeners of deckhouses on the freeboard deck is to be obtained from the following: h = c hb ABS MODU 2014, Part 3-2-3/15.3 Page no. 82where h = design head, in m (ft) hb = 0.133 L 3.0 m (L 100 m) = 0.133 L 9.8 ft (L 328 ft) but not to be less than 2.8 m (9.2 ft) c = 1.0 for front bulkheads = 0.6 for aft bulkheads = See 3-2-3/15.9 for side bulkheads L = length of the unit, in m (ft). = 74.041 mSo;h = c hbh = c hbh = 1 x 6.847h = 0.6 x 6.847h = 6.847 for aft bulkhead h = 4.108 for front bulkhead

Plating

The plating thickness is not to be less than that obtained from the following equation:

t = 3s h mm t = s/50in. h ABS MODU 2014, Part 3-2-3/15.3 Page no. 82

In no case is the plate thickness to be less than 5.0 + 0.01L mm (0.2 + 0.00012L in.).

where s = spacing of stiffeners, in m (ft)

h = design head, as defined in 3-2-3/15.3

So ;

t = 3s h mm = 3 x 0.610 6.847 = 4.78 mm

Stiffeners

Each stiffener in association with the plating to which it is attached is to have a section modulus, SM, not less than that obtained from the following equation:

SM = 3.5 sh2 cm3 SM = 0.00185 sh2 in3 ABS MODU 2014, Part 3-2-3/15.3 Page no. 82

where s = spacing of stiffeners, in m (ft) = 0.610 mh = design head, as defined in 3-2-3/15.3 = 6.847 m= tween deck height, in m (ft) = 2.8 m

So ;

SM = 3.5 sh2 cm3 = 3.5 x 0.610 x 6.847 x 2.8 cm3 = 40.931 cm3