Chapter 8 – Denotations Used
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Statutory Documents - IMO Publications and Documents - International Codes - 2011 TDC Code – Code of Safe Practice for Ships Carrying Timber Deck Cargoes, 2011 – Resolution A.1048(27) - Part B – Design of Cargo Securing Arrangements - Chapter 8 – Denotations Used

Chapter 8 – Denotations Used

 The denotations used in the formulas in the design criteria of this code are listed below:

at = Largest transverse acceleration at the centre of gravity of the deck
cargo in the forward or aft end of the stow in m/s2
B = Width of deck cargo in metres
b = Width of each individual stack of packages
CS = Calculated strength of lashing in kN, see section 6.4
fR = Reduction factor for accelerations due to expected sea state
g0 = Gravity acceleration 9.81 m/s2
H = Height of deck cargo in metres
HM = Maximum significant wave height
h = Height above deck at which hoglashings are attached to the uprights in metres
k = Factor for considering hog lashings:
k = 1 if no hog lashings are used
k = 1.8 if hog lashings are used
L = Length of the deck cargo or section to be secured in metres
LL = Length of each lashing in metres
Mbending = Design bending moment on uprights in kNm
MSL = Maximum Securing Load in kN of cargo securing devices
m = Mass of the deck cargo or section to be secured in tonnes, including absorbed water and possible icing
N = Number of uprights supporting the considered section on each side
n = Number of lashings
nb = Number of bottom blocking devices per side of the deck cargo
np = Number of stacks of packages abreast in each row
PS = Pressure from unavoidable sea sloshing in kN based on 1 kN per m2 exposed area, see CSS Code, Annex 13
PTV = Pretension in the vertical part of the lashings in kN
PTH = Pretension in the horizontal part of the lashings in kN
PW = Wind pressure in kN based on 1 kN per m2 wind exposed area, see CSS Code, Annex 13
q = Number of layers of timber packages
RS = Racking Strength per metre of timber package in kN/m, see section 4.7
α = Angle between the hatch cover top plating and the lashings in degrees
δ = Small transverse movement of deck cargo in metres due to elasticity of lashing arrangement
∊ = Elasticity factor for lashing equipment, taken as fraction of elongation experienced at the load of MSL for the lashing
μdynamic = Dynamic coefficient of friction between the timber deck cargo and the ship's deck/hatch cover and considered to be 70% of the static friction value
μinternal = Coefficient of dynamic friction found internally between the packages of sawn wood
μstatic = Static coefficient of friction between the timber deck cargo and the ship's deck/hatch cover
Parent topic: Part B – Design of Cargo Securing Arrangements
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