Discussion in 'Class Societies' started by DUCRUY Jacques, May 30, 2010.

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### DUCRUY JacquesJunior Member

Hello,

I need help for interpreting the calculation of SM floor with
ABS ORY rules.

If I see the figure 8-2 and assume that the length of transverse frame is greater of the length of the floor, is this equation correct ?

SM floor = 2.2 * SM tranv. frame * (Pb/Ps)

with Pb the design pressure for middle of floor et Ps the design pressure for middle of tranverse frame.

Jacques

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### MikeJohnsSenior Member

Did you try looking at principles of yacht design? they do some example calculations with ABSORY .

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### DUCRUY JacquesJunior Member

Hello Mike,

I had read the book of Larsson and Eliasson, but it seems that the exemple of calculation for floor concern the method ISO :

SM floor = (83.33 b l² P)/stress + SMk

In ABS ORY rule, the formula is :

SM floor = (183 b l² P)/stress + SMk (183/83.25 = 2.2)

I had think that the ABS formula cover also the load induced by grounding, but maybe It is for an other reason ?

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### LyndonJSenior Member

Grounding will be built into keel supporting floors.
Isnt the floor Z calculated by CxHxSxLxL/stress or similar ? Are you building in wood-epoxy ?

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