Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 6 Hull Local Scantling - Section 2 Load Application - 1 Load Combination
1 Load Combination
1.1 Hull girder bending
1.1.1 Normal stresses
The normal stress σhg, in N/mm2, induced by acting vertical and horizontal bending moments at the position being considered is given as follow. This stress is to be calculated for each design load set, as defined in [2] covering all dynamic load cases defined in Ch 4 in combination with Msw both in hogging and in sagging.
where:
Msw : Still water bending moment, in kNm, as defined in Ch 4, Sec 4, [2.2] in accordance with the considered design load scenario in Ch 4, Sec 7, Table 1.
Mwv-LC : Vertical wave bending moment, in kNm, of the considered dynamic load case, as defined in Ch 4, Sec 4, [3.5.2] in accordance with the considered design load scenario in Ch 4, Sec 7, Table 1, at the considered longitudinal position.
Mwh-LC : Horizontal wave bending moment, in kNm, of the considered dynamic load case, as defined in Ch 4, Sec 4, [3.5.4] in accordance with the considered design load scenario in Ch 4, Sec 7, Table 1, at the considered longitudinal position.
Iy-n50 : Net vertical hull girder moment of inertia, at the longitudinal position being considered, in m4.
Iz-n50 : Net horizontal hull girder moment of inertia, at the longitudinal position being considered, in m4.
y : Transverse coordinate of load calculation point, in m.
z : Vertical coordinate of the load calculation point under consideration, in m.
zn : Distance from the baseline to the horizontal neutral axis, in m.
1.2 Lateral pressures
1.2.1 Static and dynamic pressures in intact conditions
The static and dynamic lateral pressures in intact condition induced by the sea and the various types of cargoes, ballast and other liquids are to be considered. Applied loads will depend on the location of the elements under consideration, and the adjacent type of compartments.
1.2.2 Lateral pressure in flooded conditions
Watertight boundaries of compartments not intended to carry liquids, excluding shell envelope, are to be subjected to lateral pressure in flooded conditions.
1.3 Pressure combination
1.3.1 Elements of the outer shell
If the compartment adjacent to the outer shell is intended to carry liquids, the static and dynamic lateral pressures to be considered are the differences between the internal pressures and the external sea pressures at the corresponding draught.
If the compartment adjacent to the outer shell is not intended to carry liquids, the internal pressures and external sea pressures are to be considered independently.
1.3.2 Elements other than those of the outer shell
Except as specified in [1.3.1], the static and dynamic lateral pressures on an element separating two adjacent compartments are those obtained considering the two compartments individually loaded.
| Copyright 2020 Clasification Society, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasification Society, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasification Society'. Clasification Society Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasification Society entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. |  |