permissible still water shear force, as per GL rules

[ani.8886]

Hi all,

I want to find out the permissible still water shear force and still water bending moment for a RO-RO vessel, according to GL rules. The vessel already exists and the midship section scantlings are known.
For shear forces , I referred to
GL chapter 5- section 5 (longitudinal strength) - E -2. Vertical shear forces.
Qsw = Qt - Qwv

Qt is function of permissible still water shear stress, which in turn, is a function of Qsw (refer section 5-E-3.1)

Please suggest an alternative to determine the same.

The ship's height is 13 m , its neutral axis is 4.7 m above keel and its area moment of inertia about neutral axis is 27 m^4 (my calculation as per midship section drawing).

Someone has already done the calculation with permissible still water shear force coming out to be (+ or -)23000 kN in harbour condition, at the given section. I would like to know how he has arrived to this value.

[conceptia]

can you post the complete rule?

[ani.8886]

i have attached pdf file containing section5 - longitudinal strength.
I referred to these rules