Section 2 Structural details
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance Notes for the Classification of Special Service Craft – Version 1.0 Design Details, July 2013 - Chapter 4 Detail Design Improvement for Steel/Aluminium Construction - Section 2 Structural details

Section 2 Structural details

Parent topic: Chapter 4 Detail Design Improvement for Steel/Aluminium Construction

2.1 Detail design improvement

2.1.1 For the purposes of these Guidance Notes, structural locations have been divided into three separate groups, with a series of examples of critical structural areas together with alternative associated detail design improvements.

2.1.2 A summary of the data presented is given in Table 4.2.1 whilst the full details are given in Figure 4.2.1 Chine to frame connection as contained in this Section.

2.1.3 Generally, where alternative structural detail design improvements are provided, the details shown will provide improved fatigue strength.

2.1.4 Where asymmetrical sections are shown, the same requirements apply to bulb plate stiffeners and flat bars.

Group Application Area Item Fig. No.
  High speed craft
1   Hull structure Chine to frame connection Figure 4.2.1 Chine to frame connection
    Hull structure Chine and chine bar details (1) Figure 4.2.2 Chine and chine bar details (1)
    Hull structure Chine and chine bar details (2) Figure 4.2.3 Chine and chine bar details (2)
    Hull internal structure Frame to beam connection (radiused) Figure 4.2.4 Frame to beam connection (radiused)
    Hull internal structure Frame to beam connection (continuous bracket) Figure 4.2.5 Frame to beam connection (continuous bracket)
    Hull internal structure Lug connections between secondary stiffeners and primary stiffener webs (1) Figure 4.2.6 Lug connections between secondary stiffeners and primary stiffener webs (1)
    Hull internal structure Lug connections between secondary stiffeners and primary stiffener webs (2) Figure 4.2.7 Lug connections between secondary stiffeners and primary stiffener webs (2)
    Watertight/oiltight bulkheads Shell longitudinals collared, brackets aligned Figure 4.2.8 Shell longitudinals collared, brackets aligned
    Watertight/oiltight bulkheads Shell longitudinal (fitted brackets) Figure 4.2.9 Shell longitudinals (fitted brackets)
    Watertight/oiltight bulkheads with boundary bar Shell longitudinal (fitted brackets) Figure 4.2.10 Shell longitudinals (fitted brackets)
    Watertight/oiltight bulkheads Collar inserts in way of secondary stiffening members Figure 4.2.11 Collar inserts in way of secondary stiffening members
    Watertight/oiltight bulkheads Collar inserts in way of primary stiffening members Figure 4.2.12 Collar inserts in way of primary stiffening members
    Cross-deck structure, multi-hulls Inner side web frame to deck transverse connection Figure 4.2.13 Inner side web frame to deck transverse connection
    Cross-deck structure Deck transverse to watertight bulkhead connection Figure 4.2.14 Deck transverse to watertight bulkhead connection
    Multi-hull structure Cross-deck beam to bulkhead connection Figure 4.2.15 Cross-deck beam to bulkhead connection
  Low speed craft
2   Hull internal structure Floor to frame connection (bracketed) Figure 4.2.16 Floor to frame connection (bracketed)
    Hull internal structure Frame to beam connection Figure 4.2.17 Frame to beam connection
    Watertight/oiltight bulkheads with boundary bar Shell longitudinals (lapped brackets) Figure 4.2.18 Shell longitudinals (lapped brackets)
    Watertight/oiltight bulkheads Shell longitudinals (lapped brackets) Figure 4.2.19 Shell longitudinals (lapped brackets)
    Watertight/oiltight bulkheads Shell longitudinals collared, brackets lapped Figure 4.2.20 Shell longitudinals collared, brackets lapped
    Cross-deck structure, multi-hulls Connection between cross-deck beams and side hulls Figure 4.2.21 Connection between cross-deck beams and side hulls
  General detail
3   Cross-deck structure, multi-hulls Connection between cross-deck beams and side hulls Figure 4.2.22 Connection between cross-deck beams and side hulls
    Hull centreline structure Bar and plate keels Figure 4.2.23 Bar and plate keels
    Hull centreline structure Bar keels Figure 4.2.24 Bar keels
    Hull centreline structure Fabricated plate keel/skeg Figure 4.2.25 Fabricated plate keel/skeg
    Hull centreline structure Round bar and flat bar stems Figure 4.2.26 Round bar and flat bar stems
    Hull centreline structure Fabricated and plate stems Figure 4.2.27 Fabricated and plate stems
    Hull internal structure Floors to frame connection (radiused) Figure 4.2.28 Floor to frame connection (radiused)
    Hull internal structure Web frame to tank boundary connection Figure 4.2.29 Web frame to tank boundary connection

Figure 4.2.1 Chine to frame connection

Figure 4.2.2 Chine and chine bar details (1)

Figure 4.2.3 Chine and chine bar details (2)

Figure 4.2.4 Frame to beam connection (radiused)

Figure 4.2.5 Frame to beam connection (continuous bracket)

Figure 4.2.6 Lug connections between secondary stiffeners and primary stiffener webs (1)

Figure 4.2.7 Lug connections between secondary stiffeners and primary stiffener webs (2)

Figure 4.2.8 Shell longitudinals collared, brackets aligned

Figure 4.2.9 Shell longitudinals (fitted brackets)

Figure 4.2.10 Shell longitudinals (fitted brackets)

Figure 4.2.11 Collar inserts in way of secondary stiffening members

Figure 4.2.12 Collar inserts in way of primary stiffening members

Figure 4.2.13 Inner side web frame to deck transverse connection

Figure 4.2.14 Deck transverse to watertight bulkhead connection

Figure 4.2.15 Cross-deck beam to bulkhead connection

Figure 4.2.16 Floor to frame connection (bracketed)

Figure 4.2.17 Frame to beam connection

Figure 4.2.18 Shell longitudinals (lapped brackets)

Figure 4.2.19 Shell longitudinals (lapped brackets)

Figure 4.2.20 Shell longitudinals collared, brackets lapped

Figure 4.2.21 Connection between cross-deck beams and side hulls

Figure 4.2.22 Connection between cross-deck beams and side hulls

Figure 4.2.23 Bar and plate keels

Figure 4.2.24 Bar keels

Figure 4.2.25 Fabricated plate keel/skeg

Figure 4.2.26 Round bar and flat bar stems

Figure 4.2.27 Fabricated and plate stems

Figure 4.2.28 Floor to frame connection (radiused)

Figure 4.2.29 Web frame to tank boundary connection
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