Still-Water Bending Moment (IACS UR S11)

IACS UR S11 permissible still-water bending moment (hogging and sagging) as a function of L, B and Cb.

StructuralIACS S11

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

M_{sw,\text{sag}} = -0.065 \cdot C_1 \cdot L^2 \cdot B \cdot (C_B + 0.7), \quad M_{sw,\text{hog}} = C_1 \cdot L^2 \cdot B \cdot (0.1225 - 0.015 C_B)

Symbol	Meaning	Unit
$C_1$	Wave coefficient (L-dependent)
$L$	Length between perpendiculars	m
$B$	Beam	m
$C_B$	Block coefficient at SLWL
$M_{sw}$	Still-water bending moment	kN·m

Source: IACS UR S11 (Longitudinal Strength); IACS CSR-H (Common Structural Rules)

IACS UR S11 permissible still-water bending moment (hogging and sagging) as a function of L, B and Cb.