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《KR 规则钢质船舶第3部分船体结构》是韩国船级社(KR)发布的一份规范性文件，旨在为钢质船舶的建造和分类提供指导和标准。这份规则包含了对船体结构设计、材料选择、焊接工艺以及结构强度等关键方面的详细规定。该规则的2020版主要适用于2020年7月1日之后签订建造合同的船舶。规则中提到的2019年版的修正案于2020年1月1日生效，涉及了多个章节的修订，包括： 1. **水密隔舱**（Chapter 14）：第四节“水密门”进行了全面修订，这可能涉及到水密门的设计、安装和检验标准的更新，以确保船舶在发生事故时保持水密性。 2. **第一章一般规定**（Chapter 1）：第一节“定义”中102., 104. 和 113. 条款有所改动，这些变化可能涉及到术语的更新或定义的澄清，以便更准确地理解和应用规则。 3. **纵向强度**（Chapter 3）：第二节“弯曲强度”中的202. 4条款被修订，可能涉及到船舶结构的抗弯性能计算方法或要求的更新。 4. **双底结构**（Chapter 7）：第二节“中心纵梁和侧纵梁”中的201. 2条款有修改，这可能关系到双底结构的支撑和强度要求的调整。 5. **深舱**（Chapter 15）：第二节“深舱隔板”中202. 和203. 1条款被修订，这可能影响深舱隔板的设计和建造标准，以确保其在装载液体货物时的稳定性。规则的内容涵盖了广泛的领域，包括但不限于： - **第1章一般**：定义了相关术语和通用原则，以及计划审批和文档管理的要求。 - **第2章一般**：提供了关于船舶设计和建造的基本规定。 - **第3章纵向强度**：详细规定了船舶抵抗纵向载荷的能力。 - **第4章双底结构**：设定了双底结构的规格和建造标准。 - **第5章焊接**：明确了焊接工艺的标准和质量控制要求。 - **第6章结构尺寸**：规定了不同部位的结构厚度和尺寸，以保证结构强度和耐久性。这些修订反映了船级社对船舶安全性和可靠性的持续关注，同时也体现了技术进步和行业标准的变化。对于船舶设计师、工程师、建造商以及船东来说，理解并遵循这些规则至关重要，以确保新建船舶符合最新的安全和性能标准。

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2020

Rules for the Classification of Steel Ships

Part 3

Hull Structures

RA-03-E

-  iii  -
CONTENTS
CHAPTER  1    GENERAL ··········································································································· 1
Section  1    Definitions ······································································································· 1
Section  2    General ············································································································ 4
Section  3    Approval  of  Plans  and  Documents ··························································· 5
Section  4    Materials ·········································································································· 6
Section  5    Weldings ······································································································· 11
Section  6    Scantlings ······································································································ 16
Section  7    Workmanship ······························································································· 18
Section  8    Corrosion  Protection  Coating ···································································· 19
CHAPTER  2    STEMS  AND  STERN  FRAMES ···································································· 21
Section  1    Stems ············································································································ 21
Section  2    Stern  Frames ······························································································· 21
CHAPTER  3    LONGITUDINAL  STRENGTH ········································································ 27
Section  1    General ·········································································································· 27
Section  2    Bending  Strength ························································································ 28
Section  3    Shear  Strength ····························································································· 31
Section  4    Buckling  Strength ························································································ 35
CHAPTER  4    PLATE  KEELS  AND  SHELL  PLATINGS ····················································· 39
Section  1    General ·········································································································· 39
Section  2    Plate  Keels ··································································································· 39
Section  3    Shell  Plating  below  Strength  Deck ························································· 39
Section  5    Side  Plating  in  way  of  Superstructure ··················································· 43
Section  6    Compensation  at  ends  of  Superstructure ············································· 44
Section  7    Local  Compensation  of  Shell  Plating ······················································ 44
CHAPTER  5    DECKS ·············································································································· 45
Section  1    General ·········································································································· 45
Section  2    Effective  Sectional  Area  of  Strength  Deck ··········································· 45
Section  3    Deck  Plating ································································································· 46
Section  4    Wood  Decks  and  Deck  Compositions ···················································· 47
CHAPTER  6    SINGLE  BOTTOMS ························································································ 49
Section  1    General ·········································································································· 49
Section  2    Centre  Keelsons ·························································································· 49
Section  3    Side  Keelsons ······························································································ 49
Section  4    Floor  Plates ·································································································· 50

-  iv  -
CHAPTER  7    DOUBLE  BOTTOMS ······················································································ 53
Section  1    General ·········································································································· 53
Section  2    Centre  Girders  and  Side  Girders ····························································· 55
Section  3    Solid  Floors ··································································································· 58
Section  4    Bottom  Longitudinals ·················································································· 60
Section  5    Inner  Bottom  Plating,  Margin  Plates  and  Bottom  Shell  Plating ······· 62
Section  6    Hold  Frame  Brackets ················································································· 65
Section  7    Open  Floors ·································································································· 65
Section  8    Construction  of  Strengthened  Bottom  Forward ··································· 66
CHAPTER  8    FRAMES ··········································································································· 71
Section  1    General ·········································································································· 71
Section  2    Frame  Spacing ····························································································· 72
Section  3    Hold  Frames ································································································· 72
Section  4    Side  Longitudinals ······················································································· 76
Section  5    Tween  Deck  Frames ·················································································· 77
CHAPTER  9    WEB  FRAMES  AND  SIDE  STRINGERS ···················································· 79
Section  1    General ·········································································································· 79
Section  2    Web  Frames ································································································ 79
Section  3    Side  Stringers ······························································································ 80
Section  4    Side  Transverse ··························································································· 82
Section  5    Cantilever  Beams ························································································ 83
CHAPTER  10    BEAMS ··········································································································· 89
Section  1    General ·········································································································· 89
Section  2    Deck  Load ···································································································· 90
Section  3    Longitudinal  Beams ···················································································· 92
Section  4    Transverse  Beams ······················································································ 93
CHAPTER  11    DECK  GIRDERS ··························································································· 95
Section  1    General ·········································································································· 95
Section  2    Longitudinal  Deck  Girders ········································································· 95
Section  3    Transverse  Deck  Girders ··········································································· 98
Section  4    Deck  Girders  in  Tanks ··············································································· 98
Section  5    Hatch  Side  Girders ····················································································· 99
Section  6    Hatch  End  Girders ······················································································ 99
CHAPTER  12    PILLARS ······································································································ 101
Section  1    General ········································································································ 101
Section  2    Scantling  of  Pillars ···················································································· 101