Section
4 Hull envelope framing
4.1 Symbols
4.1.1 The
symbols used in this Section are defined as follows:
|
h
|
= |
head
or load height, in metres, and is to be taken as: |
|
|
= |
for bottom longitudinals,
frames, girders and transverses: the depth D
|
|
|
= |
for side longitudinals:
the distance of the longitudinal below the deck at side, but not less
than 0,01L + 0,7
|
|
|
= |
for side transverses:
the distance from the mid-point of span to the deck at side, but not
less than 0,01L + 0,7
|
|
|
= |
for deck longitudinals
and transverses: the head equivalent to cargo carried at a stowage
rate of 1,39 m3/tonne, but is not to be taken less than
0,01L + 0,7
|
|
|
= |
for side frames:
the distance from the midpoint of span to the deck at the side |
|
s
|
= |
spacing
of frames, beams or longitudinals, in mm |
|
S
|
= |
spacing
or mean spacing of girders, transverses or floors, in metres |
4.2 General
4.2.1 Bottom,
side and deck transverses are to be connected in such a manner as
to ensure continuity of the transverse ring system, and longitudinals
are to be attached to transverses. In way of deck and bottom transverses,
a deep web frame is to be fitted.
4.2.2 End
connections of longitudinals at bulkheads are to provide adequate
fixity and direct continuity of longitudinal strength.
4.2.3 Brackets
at the top and bottom of side frames are to extend to the adjacent
deck or bottom longitudinal to which they are to be attached.
4.2.4 In pontoons
where truss arrangements, comprising top and bottom girders in association
with pillars and diagonal bracing, are used in the support of the
deck loads, the diagonal members are generally to have angles of inclination
with the horizontal of about 45° and cross-sectional area of approximately
50 per cent of the adjacent pillar in accordance with Pt 4, Ch 1, 4.4 Deck supporting structure, with a head in accordance
with Pt 4, Ch 1, 4.1 General 4.1.1.
4.2.5 Adequate
support must be provided on the centreline for the loads imposed on
the structure when the ship is in dry dock.
4.3 Longitudinal framing
4.3.1 The
scantlings of bottom, side and deck longitudinals are to comply with
the requirements of Table 5.4.1 Longitudinal framing.
Table 5.4.1 Longitudinal framing
| Position of
longitudinals
|
Modulus, in
cm3
|
| Bottom
|
* Z =
11,0l
e
2
sh × 10–3
|
| Side shell
|
* Z =
8,0l
e
2
sh × 10–3
|
| Deck
|
* Z =
5,5l
e
2
sh × 10–3
|
| * For the requirements for barges
carrying liquid cargoes in bulk see
Pt 4, Ch 10 Single Hull Oil Tankers
|
|
|
4.4 Transverse framing
4.4.1 The
scantlings of bottom and side frames and deck beams are to comply
with the requirements of Table 5.4.2 Transverse framing.
Table 5.4.2 Transverse framing
| Position of member
|
Modulus, in
cm3
|
| Bottom and side frames
|
* Z =
9,5l
e
2
sh × 10–3
|
| Deck beams
|
* Z =
4,5l
e
2
sh × 10–3
|
| * For the requirements for barges
carrying liquid cargoes in bulk see
Pt 4, Ch 10 Single Hull Oil Tankers
|
|
|
4.5 Primary supporting structure
4.5.1 Primary
supporting members are to comply with the requirements of Table 5.4.3 Primary supporting
structure.
Table 5.4.3 Primary supporting
structure
| Position of
member
|
Modulus, in
cm3
|
| Bottom transverse
|
* Z =
11,0l
e
2
Sh
|
| Side transverse
|
* Z =
8,0l
e
2
Sh
(may be reduced by 5 per cent for vessels classed `100A1
extended protected water service')
|
| Deck transverse
|
* Z =
5,5l
e
2
Sh
|
| Bottom girder
|
* Z =
9,5l
e
2
Sh
|
| Deck longitudinal
girder
|
* Z =
5,0l
e
2
Sh
|
| * For the requirements for barges carrying liquid
cargoes in bulk see
Pt 4, Ch 10 Single Hull Oil Tankers
|
|
|
|
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