Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 4 Loads - Section 8 Loading Conditions - 5 Standard Loading Conditions for Fatigue Assessment
5 Standard Loading Conditions for Fatigue Assessment
5.1 Oil tanker
5.1.1 The standard loading conditions to be applied to oil tankers for fatigue assessment as required in Ch 9, Sec 1, [6.2], are defined in Table 22 to Table 24. Where fuel oil tanks, other oil tanks or fresh water tanks are arranged in way of the cargo hold region, the filling level of them are to be taken as full for direct strength analysis according to Ch 7 and Ch 9, Sec 5. For simplified stress analysis according to Ch 9, Sec 4, the filling level of them are to be taken as half height, measured from ztop to the lowest point of tank.
Table 22 : Standard design FE loading conditions for fatigue assessment of oil tankers except for foremost and aftmost cargo holds
| No. | Description | Loading pattern | Still water loads | Dynamic Load Cases | ||
| Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | ||||
| Oil tankers with two oil-tight bulkheads | ||||||
| A1-F | Full load | 
|
TSC | 60% (sag.) | All | |
| A2-F | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| Oil tankers with centreline oil-tight bulkhead | ||||||
| B1-F | Full load | 
|
TSC | 60% (sag.) | All | |
| B2-F | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| (1) The actual shear force that results from the application of static and dynamic local loads to the FE model are to be used. | ||||||
Table 23 : Standard design FE loading conditions for fatigue assessment of oil tankers for aftmost cargo hold
| No. | Description | Loading pattern | Still water loads | Dynamic Load Cases | ||
| Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | ||||
| Oil tankers with two oil-tight bulkheads | ||||||
| A1-F | Full load | 
|
TSC | 60% (sag.) | All | |
| A2-F | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| Oil tankers with centreline oil-tight bulkhead | ||||||
| B1-F | Full load | 
|
TSC | 60% (sag.) | All | |
| B2-F | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| (1) The actual shear force that results from the application of static and dynamic local loads to the FE model are to be used. | ||||||
Table 24 : Standard design FE loading conditions for fatigue assessment of oil tankers for foremost cargo hold
| No. | Description | Loading pattern | Still water loads | Dynamic Load Cases | ||
| Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF (1) | ||||
| Oil tankers with two oil-tight bulkheads | ||||||
| A1-F | Full load | 
|
TSC | 60% (sag.) | All | |
| A2-F | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| Oil tankers with centreline oil-tight bulkhead | ||||||
| B1-F | Full load | 
|
TSC | 60% (sag.) | All | |
| B2-F | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| (1) The actual shear force that results from the application of static and dynamic local loads to the FE model are to be used. | ||||||
5.2 Bulk carriers
5.2.1 The standard loading conditions to be applied to bulk carriers for fatigue assessment as required in Ch 9, Sec 1, [6.3] are defined in Table 25, to Table 31 according to their additional service feature notations and the location of the assessed details. Where fuel oil tanks, other oil tanks or fresh water tanks are arranged in way of the cargo hold region, the filling level of them are to be taken as full for direct strength analysis according to Ch 7 and Ch 9, Sec 5. For simplified stress analysis according to Ch 9, Sec 4, the filling level of them are to be taken as half height, measured from ztop to the lowest point of tank.
Table 25 : Standard design FE Load combinations for fatigue assessment applicable to empty hold of BC-A in alternate condition (EA) - cargo hold region except aftmost and foremost cargo holds
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | Dynamic load case |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (2) | Full load alternate | 
|
TSC | 75% (hog.) | 100% | All |
| 3-F (1) | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| 4-F (2) (3) | Heavy ballast | 
|
TBAL-H | 75% (sag.) | 100% | All |
| 5-F (2) (4) | 
|
TBAL-H | 45% (hog.) | 100% | All | |
| 6-F (1) (5) | 
|
TBAL-H | 45% (hog.) | All | ||
| (1) The
actual shear force curve that results from the application of static and
dynamic local loads to the FE model are to be used.
(2) The actual shear force curve that results from the application of static and dynamic local loads to the FE model are to be used. Where this shear force exceeds the target value, the correction of vertical loads is to be applied to adjust the shear force down to the target value. (3) This condition is to be considered for empty cargo hold which is assigned as ballast hold, if any (4) This condition is applicable when the WB hold corresponds to the forward or aft hold of the 3 hold model. (5) This condition is applicable when the WB hold is located outside the 3 cargo hold model |
||||||
Table 26 : Standard design FE Load combinations for fatigue assessment applicable to loaded hold of BC-A in alternate condition (FA) - cargo hold region except aftmost and foremost cargo holds
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | Dynamic load case |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (2) | Full load alternate | 
|
TSC | 75% (hog.) | 100% | All |
| 3-F (1) | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| 4-F (2) (3) | Heavy ballast | 
|
TBAL-H | 75% (sag.) | 100% | All |
| 5-F (2) (4) | 
|
TBAL-H | 45% (hog.) | 100% | All | |
| 6-F (1) (5) | 
|
TBAL-H | 45% (hog.) | All | ||
| (1) The
actual shear force that results from the application of static and
dynamic local loads to the FE model are to be used.
(2) The actual shear force that results from the application of static and dynamic local loads to the FE model are to be used. Where this shear force exceeds the target value, the correction of vertical loads is to be applied to adjust the shear force down to the target value. (3) This condition is to be considered for loaded cargo hold which is assigned as ballast hold, if any (4) This condition is applicable when the WB hold corresponds to the forward or aft hold of the 3 hold model. (5) This condition is applicable when the WB hold is located outside the 3 cargo hold model. |
||||||
Table 27 : Standard design FE Load combinations for fatigue assessment applicable to loaded hold of BC-A in alternate condition (FA) - Aftmost cargo hold
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF (1) | Dynamic Load Cases |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (2) | Full load alternate | 
|
TSC | 75% (hog.) | All | |
| 3-F (1) | Normal ballast | 
|
TBAL | 80% (sag.) | 100% | All |
| 4-F (1) (3) | Heavy ballast | 
|
TBAL-H | 45% (hog.) | All | |
| (1) The
actual shear force that results from the application of static and
dynamic local loads to the FE model are to be used.
(2) The actual shear force that results from the application of static and dynamic local loads to the FE model are to be used. Where this shear force exceeds the target value, the correction of vertical loads is to be applied to adjust the shear force down to the target value. (3) This condition is applicable when the WB hold is located outside the 3 cargo hold model. |
||||||
Table 28 : Standard design FE Load combinations for fatigue assessment applicable to loaded hold of BC-A in alternate condition (FA) - Foremost cargo hold
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | Dynamic Load Cases |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (2) | Full load alternate | 
|
TSC | 75% (hog.) | 100% | All |
| 3-F (1) | Normal ballast | 
|
TBAL | 80% (sag.) | All | |
| 4-F (1) (3) | Heavy ballast | 
|
TBAL-H | 45% (hog.) | All | |
| (1) The
actual shear force that results from the application of static and
dynamic local loads to the FE model are to be used.
(2) The actual shear force that results from the application of static and dynamic local loads to the FE model are to be used. Where this shear force exceeds the target value, the correction of vertical loads is to be applied to adjust the shear force down to the target value. (3) This condition is applicable when the WB hold is located outside the 3 cargo hold model. |
||||||
Table 29 : Standard design FE load combinations for fatigue assessment of BC-B, BC-C bulk carriers - cargo hold region except aftmost and foremost cargo holds
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | Dynamic Load Cases |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (1) | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| 3-F (2) (3) | Heavy ballast | 
|
TBAL-H | 75% (sag.) | 100% | All |
| 4-F (2) (4) | 
|
TBAL-H | 45% (hog.) | 100% | All | |
| 5-F (1) (5) | 
|
TBAL-H | 45% (hog.) | All | ||
| (1) The
actual shear force curve that results from the application of static and
dynamic local loads to the FE model are to be used.
(2) The actual shear force curve that results from the application of static and dynamic local loads to the FE model are to be used. Where this shear force exceeds the target value, the correction of vertical loads is to be applied to adjust the shear force down to the target value. (3) This condition is to be considered for cargo hold which is assigned as ballast hold, if any. (4) This condition is applicable when the WB hold corresponds to the forward or aft hold of the 3 hold model. (5) This condition is applicable when the WB hold is located outside the 3 cargo hold model. |
||||||
Table 30 : Standard design FE load combinations for fatigue assessment of BC-B, BC-C bulk carriers - Aftmost cargo hold
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | Dynamic Load Cases |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (1) | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| 3-F (1) | Heavy ballast | 
|
TBAL-H | 45% (hog.) | All | |
| (1) The actual shear force curve that results from the application of static and dynamic local loads to the FE model are to be used. | ||||||
Table 31 : Standard design FE load combinations for fatigue assessment of BC-B, BC-C bulk carriers - Foremost cargo hold
| No. | Description | Loading pattern Aft Mid Fore | Draught | CBM-LC : % of perm. SWBM | CSF-LC : % of perm. SWSF | Dynamic Load Cases |
| 1-F (1) | Full load homogeneous | 
|
TSC | 40% (sag.) | All | |
| 2-F (1) | Normal ballast | 
|
TBAL | 80% (hog.) | All | |
| 3-F (1) | Heavy ballast | 
|
TBAL-H | 45% (hog.) | All | |
| (1) The actual shear force curve that results from the application of static and dynamic local loads to the FE model are to be used. | ||||||
| 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. |  |