# Transverse bending moment and shear force

Discussion in 'Class Societies' started by thinhuk, Feb 25, 2020.

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### thinhukJunior Member

Hi everyone,
Could anybody please explain how does transverse bending moment and shear force apply for scantling the cross-deck of catamaran?
Accordingly BV NR396 C3.4.2.3 the transverse bending moment and shear force is calculated, but I just don't understand how does this bending moment apply for each frame and does this moment subdivide into n-beam of vessel then it is bending moment for each frame?

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2. Joined: Oct 2008
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You should read Proboat Magazine issue 182, dec-jan 2020. It is all explain eaisly in that:

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### fallguySenior Member

I'd like to believe I just overbuilt my small cat.

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### jehardimanSenior Member

While the formula posted gives the total bending moment, the apportion of the moment (and shear) is done with a classic structural correlated deflection analysis.

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### thinhukJunior Member

Thank you so much.
This information was useful, I got the basic of understanding the transverse strength of catamaran especially at the cross deck.
And now with the buckling checking accordingly BV rule, it still a massive, could you please drop me an example of calculating buckling of plate according to Class Rule?

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### thinhukJunior Member

Yep, since I had read the magazine which Ad Hoc recommended, I had understood how combine the allowable stress and the deflection into calculated.

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