ABS-Grade-AH36/ABS-AH36/DNV-AH36/NV-AH36/Shipbuilding-Steel-Plate/Marine-Steel-Plate

The following are some relevant contents and calculation formulas related to longitudinal strength in the Rules for Classification of Steel Ships:

 

Calculation of midship section modulus

 

For a simple rectangular beam model (which can be analogized to a hull girder), the calculation formula for the midship section modulus is: , where is the moment of inertia of the section and is the distance from the neutral axis to the stress calculation point.

 

For the midship section of a ship, when considering the combination of structural members such as the bottom plate, side plate, and deck, the calculation of involves summing up the moment of inertia of each member with respect to the neutral axis. For example, for discrete plate and profile members, , where and are the width and thickness of the -th member respectively, is its area, and is the distance from this member to the neutral axis.

 

Calculation of longitudinal bending stress

 

According to the beam bending theory, the longitudinal bending stress can be calculated by the formula , where is the total longitudinal bending moment borne by the hull girder (which can be obtained by superimposing the hydrostatic bending moment and the wave bending moment, etc.), and is the midship section modulus.

 

These formulas are the basis for evaluating and calculating the longitudinal strength. However, in practical applications, the specification will consider more complex factors (such as corrosion allowance, different loading conditions, material properties, etc.) to modify and improve the calculation results.

 

Grade	Chemical compostion %
C	Si	Mn	P	S	Als

D

≤0.21

≤0.35

0.6-1.2

≤0.035

≤0.035

≥0.015

 

 

 

 

 

 

 

 

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