The grade of steel to be ud is, in general, related to the thickness of the material and the stress pattern associated with its location. Thickness, t, in mm | Material class | I | II | III | Mild steel | H.T. steel | Mild steel | H.T. steel | Mild steel | H.T. steel | tkedou ≤ 15
15 < t ≤ 20
20 < t ≤ 25
25 < t ≤ 30
30 < t ≤ 35
35 < t ≤ 40
t > 40 | A
A
A
A
B
B
D | AH
AH
AH
AH
AH
AH
DH | A
A
B
D
D
D
E | AH
AH
AH
微笑smileDH
DH
DH
EH | A
B
D
D
E
E
E | AH
AH
DH
DH
EH
EH
EH | | | | | | | |
Structural member category | Within
0,4L
amidships | Outside
0,4L
amidships | bisonSECONDARY: Lower strake in longitudinal bulkhead Deck plating expod to weather, in general ∙ Side plating | I | A/AH | PRIMARY: Bottom plating, including keel plate Strength deck plating, excluding tho belonging to the special category Continuous longitudinal members above strength deck, excluding longitudinal hatch coamings Upper strake in longitudinal bulkhead ∙ Vertical strake (hatch side girder) and upper sloped strake in top wing tank | asmuchasII | A/AH | SPECIAL: Sheerstrake or rounded gunwale, e Note 1 Stringer plate at strength deck, e Note 1 Strength deck plating at outboard corners of cargo hatch openings in container carriers and other ships with similar hatch opening configurations, e Note 2 Strength deck plating at corners of cargo hatch openings in bulk carriers, or carriers, combination carriers and other ships with similar hatch opening configuration, 2015年12月四级e Note 3 Deck strake at longitudinal bulkhead, eall well Note 4 Bilge strake, e Notes 5 and 6 Longitudinal hatch coaming of length greater than 0,15L, e Note 7 ∙ End brackets and deckhou transition of longitudinal cargo hatch coamings, e Note 7 广州伊利莎白医院 | III | II, in general I,
outside 0,6L | NOTES
1. In ships with length exceeding 250 m, sheerstrake or rounded gunwale and stringer plate at strength deck are not to be less than Grade E/EH within 0,4L amidships.
2. Plating at outboard corners of cargo hatch opening and plating interctions of the longitudinal underdeck girders and the cross-deck strips are not to be less than Class III within the length of the cargo region.
3. Not to be less than Class III within 0,6L amidships and Class II within the remaining length of the cargo region.
4. Excluding deck plating in way of inner-skin bulkhead of double hull ships.
haveto5. In ships with a double bottom over the full breadth and with length less than 150 m, bilge strake may be of Class II within 0,4L amidships.
6. In ships with length exceeding 250 m, bilge strake is not to be less than Grade D/DH within 0,6L amidships
英语关键词7. Grade is not to be less than D/DH.
8. Corner inrts in way of any complex openings such as for lifts and side doors which may impinge on the deck plating or stringer plate are to be of Grade D/DH for t ≤ 20 mm and Grade E/EH for t > 20 mm.
9. For strength members not mentioned, Grade A/AH may generally be ud.
10. Within 0,4L amidships, single strakes required to be of Class III or of Grade E/EH are to have breadths not less than 800 + 5L mm, but need not be greater than 1800 mm.
11.现状英文 The material class ud for reinforcement and the quality of material (i.e. whether mild or higher tensile steel) ud for welded attachments, such as waterway bars and bilge keels, is to be similar to that of the hull envelope plating in way. Where attachments are made to rounded gunwale plates, special consideration will be given to the required grade of steel, taking account of the intended structural arrangements and attachment details.
12. The material class for deck plating, sheerstrake and upper strake of longitudinal bulkhead within 0,4L amidships is also to be applied at structural breaks of the superstructure, irrespective of position.
13. Engine at top plates outside 0,6L amidships may be Grade A/AH. Steel grade requirement for top plates within 0,6L amidships will be specially considered.
14. Steel grade is to correspond to the as-fitted thickness.
15. Plating materials for sternframes, rudders, rudder horns and shaft brackets are, in general, not to be of lower Grades than corresponding to Class II. For rudder and rudder body plates subjected to stress concentrations (e.g. in way of lower support of mi-spade rudders or at upper part of spade rudders) Class III is to be applied. | | | |
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