"BV NR546规范:复合材料和胶合板船体总体要求与计算原则"

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The Bureau Veritas NR546 Rule Note outlines the general requirements and calculation principles for ships with hulls and superstructures made of composite materials or plywood. The scope of application includes ships with composite or plywood components in their hull and superstructure. The Rule Note defines the requirements for hull scantling and arrangements, focusing on raw materials, calculation methodology, and hull structure. The purpose is to establish standards for the design and construction of ships using these materials, ensuring their safety and structural integrity. This Rule Note serves as a comprehensive guideline for shipbuilders, designers, and classification societies to follow when working with composite materials and plywood in ship construction. It provides a framework for ensuring compliance with regulatory standards and best practices in the maritime industry. Overall, the Rule Note emphasizes the importance of proper material selection, calculation methods, and structural design to ensure the seaworthiness and safety of ships built with composite materials and plywood.

NR 546, Sec 3

22 Bureau Veritas Draft July 2019

9.3.2 Web frames, transverse partial bulkheads and other

equivalent strengthening of each superstructure tier are to

be arranged, where practicable, in line with the transverse

reinforced structure below.

Web frames are also to be arranged in way of large open-

ings, tender davits, winches, provision cranes and other

areas subjected to local loads.

9.3.3 Openings

All the openings in superstructures and deckhouses

exposed to greenseas are to be fitted with sills or coamings

as defined in the Society Rules for the classification and/or

certification of ships (see Sec 1, [1.1.2]).

The attention of the Shipowners, Shipyards and Designer is

drawn on the fact that the flag Administration may request

application of National Rules.

9.3.4 Sidescutlles, windows and skylights

Sidescuttles, windows and skylights arrangement and scant-

lings are to be as defined in the Society Rules for the classi-

fication and/or certification of ships (see Sec 1, [1.1.2]).

9.3.5 Access and doors

Access openings cut in side plating of enclosed superstruc-

tures are to be fitted with doors having a strength equivalent

to the strength of the surrounding structure.

Special consideration is to be given to the connection of

doors to the surrounding structure.

Securing devices which ensure watertightness are to

include tight gaskets, clamping dogs or other similar appli-

ances, and are to be permanently attached to the bulkheads

and doors. The doors are to be operable from both sides.

10 Other structures

10.1 Machinery spaces

10.1.1 General

The arrangements of hull structure in the machinery space as

regards general strength are to be determined according to

the relevant criteria defined in the Society Rules for the clas-

sification and/or certification of ships (see

Sec 1, [1.1.2]

It is no substitute to machinery manufacturer’s requirements

which have to be dealt with at Shipyard diligence.

The Designer may propose arrangements and scantlings

alternative to the Society Rules requirements, on the basis of

direct calculations which are to be submitted to the Society

for examination on a case-by-case basis.

The Society may also require such direct calculations to be

carried out whenever deemed necessary.

10.1.2 Seatings of engines

The scantling of seatings of main engines and thrust bear-

ings are to be adequate in relation to the weight and power

of engines and the static and dynamic forces transmitted by

the propulsive installation.

Transverse and longitudinal members supporting the seat-

ings are to be located in line with floors and bottom girders.

Seatings are to be adequately connected to floors and girders.

10.2 Bulwark

10.2.1 General

The plating and secondary stiffeners are to be checked as

defined for side shell in the applicable requirements of the

Society Rules for the classification and/or certification of

ships (see Sec 1, [1.1.2]).

The bending moment, in kNm, and the shear force, in kN,

to take into account for the scantling check of vertical stays

are to be calculated by direct calculation, taking into

account the side shell loads defined in the Society Rules for

the classification and/or certification of ships, or as defined

in [10.2.2].

The analysis of vertical analysis is to be carried out as

defined for stiffeners in Sec 7, taking into account the safety

coefficient in relation with the external load considered.

10.2.2 The bending moment, in kNm, and the shear force,

in kN, of stays at their connection to the deck structure in

way of the lower part of the bulwark can be obtained by the

following formulae:

• Bending moment: The greater value of

and:

-if

 ≥ 0,6m and s ≥ 0,6m:

-if

 ≥ 0,6m and s < 0,6m:

-if  < 0,6m:

with s not taken greater than 0,6m.

• Shear force: The greater value of

and:

-if

 ≥ 0,6m and s ≥ 0,6m:

-if

 ≥ 0,6m and s < 0,6m:

-if  < 0,6m:

with s not taken greater than 0,6m.

where:

, p

ssmin

: Sea pressure and impact pressure on side shell

as defined in the Society Rules for the classifica-

tion and/or certification of ships (see Sec 1,

[1.1.2])

s : Spacing of stays, in m

 : Length of stays, in m.

s

------------

M028p

ssmin

 03,–(),=

M06sp

ssmin

 03,–(),=

ssmin

s

---------------------

s=

T028p

ssmin

T06sp

ssmin

s=

NR 546, Sec 3

Draft July 2019 Bureau Veritas 23

10.3 Helicopter deck and platform

10.3.1 Structure of the helicopter deck located on super-

structure weather deck or on platform permanently con-

nected to the hull structure is to be examined according to

general arrangement, as applicable, and loading loads as

defined in NR467, Pt B, Ch 8, Sec 11.

Where the acceleration at helicopter centre of gravity for

upright and inclined ship conditions are not defined by the

ship designer, values determined on the basis of NR467 are

to be taken into account.

Landing area laminates, as well as secondary and primary

stiffeners, are to be examined by direct calculations. It is to

be checked that the safety factors, defined in Sec 2, [1], are

at least equal to the minimum rule safety factors given in the

Rules for the classification and/or certification of ships (see

Sec 1, [1.1.2]), multiplied by the following coefficients:

• 1,4 for landing area located above accommodation

spaces

• 1,15 for landing area located outside a zone covering

accommodation spaces

• 1,0 for emergency condition.

Attention is drawn on any possible specific requirement that

could be issued by Flag Administration with respect to the

structural fire protection and the use of composite materials.

10.4 Hull structure reinforcement for naviga-

tion in ice

10.4.1 General

The ice strengthening requirements defined in the present

article are applicable to the hull structure of ships which

have been assigned one of the following additional class

notation:

• YOUNG ICE 1

• YOUNG ICE 2

The assignment of these additional class notations are sub-

jected to the compliance with NR467, Pt A.

10.4.2 Owner’s responsibility

It is the responsibility of the Owner to decide which ice

class notation is the most suitable in relation to the

expected service conditions of the ship.

The ice conditions for the assignment of additional class

notation YOUNG ICE 1 and YOUNG ICE 2 are defined in

NR467, Pt F, Ch 8, Sec 1.

As a guidance, the relation between these additional class

notation and the associated ice conditions compatible with

the strengthening defined in the present article are as follow:

• young ice (gray or whitish) having a maximum thickness of

30 cm)

• ice concentration:

- YOUNG ICE 1: Open ice (concentration between

6/10 th and 3/10 th)

- YOUNG ICE 2: Very open ice (concentration less

than 3/10 th)

10.4.3 General structure scantling

The structure hull areas (longitudinal and vertical) to be

strengthened are defined in NR467, Pt F, Ch 8, Sec 2.

The scantling formulae defined in the present article are

based on simply supported hypothesis of the structure ele-

ment.

10.4.4 Plate scantling

In addition to the analysis of side shell panels carried out in

accordance with Sec 6, [5], the panels within the ice belt

and subject to ice loads are to be checked according to Sec

6, [5.1.2] taking into account the following values of bend-

ing moment, in kN.m/m, and shear force, in kN/m:

a) For transverse framing:

b) For longitudinal framing:

where:

: Coefficient to be taken equal to:

h : Height of load area, in m, as defined in NR467,

Pt F, Ch 8, Sec 2

s : Spacing, in m, of ordinary or primary stiffeners,

as applicable

: Ice pressure on the shell panel, in N/mm

, equal

to 0,75p

: Design ice pressure, in N/mm

, as defined in

NR467, Pt F, Ch 8, Sec 2, [3.2.2] calculated with:

•for YOUNG ICE 1 C

= 0,6 and

for YOUNG ICE 2 C

= 0,3

• Nominal ice pressure p

, in N/mm

, equal to 3.

------------------

----------------

h2s h–()

--------------------------------

--------------

13,

42,

---

18,+





---------------------------

– 1<=

1.4 0 4

---





– 1>=

NR 546, Sec 3

24 Bureau Veritas Draft July 2019

10.4.5 Stiffener scantling

In addition to the analysis of stiffeners carried out in accord-

ance with Sec 7, [4], the stiffeners within the ice belt and

subject to ice loads are to be checked according to Sec 7,

[4.1.3] taking into account the following values of bending

moment, in kN.m, and shear force, in kN:

a) For transverse stiffener:

Note 1: Where less than 15% of the span of the stiffener is located

within the ice strengthening hull area as defined in [10.4.3],

the present check is not required.

b) For longitudinal stiffener:

where:

p : Design ice pressure, in N/mm

, as defined in

[10.4.4].

10.4.6 General structure arrangement

As a general rule, the local reinforcement of the side shell

panel in the area of the ice belt and subject to ice loads is to

be examined on a case-by-case basis.

In particular, when sandwich panels are used for side shell,

designer is to submit the mechanical characteristics and is

to justify the scantling of the sandwich to avoid excessive

indentation of the sandwich and deterioration of strength

and stiffness properties by collapse with the core crushing

beneath the ice belt area due to local instability of the com-

pressive face sheets.

Local monolithic side shell panels may be required in the

ice belt area.

11 Special features

11.1 Bow doors, bow visors and inner doors

11.1.1 Application and general arrangement

The requirements application and the general arrangement

of bow doors, bow visors and inner doors are to be in

accordance with the Rules for the classification and/or certi-

fication of ships (see Sec 1, [1.1.2]).

11.1.2 Plate and secondary stiffeners

Scantlings of the plates and secondary stiffeners of bow

doors and bow visors are to be not less than scantlings of

the plates and secondary stiffeners of hull fore part obtained

according to the Society Rules for the classification of ships

(see Sec 1, [1.1.2]) and to the general requirements defined

in the present Rule Note.

11.1.3 Primary supporting members

Primary supporting member scantlings are to be determined

by direct calculation in accordance with the Rules for the

classification of ships (see Sec 1, [1.1.2]).

11.1.4 Securing and supporting devices

Securing and supporting devices are to be examined on a

case by case by the Society and on the bases defined in

[11.1.3]. A particular attention is to be drawn to the con-

nection between metal devices and composite structure.

11.2 Side doors and stern doors

11.2.1 Application and general arrangement

The requirements application and the general arrangement

of side doors and stern inner doors are to be in accordance

with the Rules for the classification and/or certification of

ships (see Sec 1, [1.1.2]).

11.2.2 Plate and secondary stiffeners

Scantling of the plates and stiffeners of side doors and bow

doors are to be not less than scantlings of the adjacent side

shell obtained according to the Society Rules for the classi-

fication and/or certification of ships (see Sec 1, [1.1.2]).

11.2.3 Primary supporting members

Primary supporting member scantlings are to be determined

by direct calculation in accordance with the Rules for the

classification of ships (see Sec 1, [1.1.2]).

11.2.4 Securing and supporting devices

Securing and supporting devices are to be examined on a

case by case by the Society and on the bases defined in

[11.2.3]. A particular attention is to be drawn to the con-

nection between metal devices and composite structure.

11.3 Hatch covers

11.3.1 General

General arrangement, securing devices, height of coamings

and weathertightness where applicable and structure scant-

ling for hatch covers located on exposed or non exposed

decks are to be as defined by the Society Rules for the clas-

sification and/or certification of ships (see Sec 1, [1.1.2].

11.4 Rudders

11.4.1 Rudder stock and rudder blade scantlings

Rudder stock and rudder blade scantlings are to be checked

by direct calculations, taking into account the forces and

torque acting on rudder as defined in the applicable

requirements of the Society Rules for the classification

and/or certification of ships (see Sec 1, [1.1.2]).

Where it is not specified otherwise, the safety factors to take

into account to check the rudder blade and the rudder stock

scantlings are those defined in Sec 2, [1.3], increased by a

coefficient to be taken at least equal to 1,3.

phs 2 h–()

-------------------------------

Tpsh10

ph

------------

ph

----------

NR 546, Sec 3

Draft July 2019 Bureau Veritas 25

11.4.2 Rudder horn and solepiece scantlings

Rudder horn and solepiece scantlings are to be checked by

direct calculations, taking into account the forces and

torque moments acting on rudder horn or solepiece as

defined in the applicable requirements of the Society Rules

for the classification and/or certification of ships (see Sec 1,

[1.1.2]).

Where it is not specified otherwise, the safety factors to take

into account to check the rudder horn and the solepiece

scantlings are those defined in Sec 2, [1.3], increased by a

coefficient to be taken at least equal to:

• 1,9 for the main stress safety factor

• 1,3 for the combined stress safety factor.

11.5 Water jet propulsion tunnel

11.5.1 The drawings of water jet ducts, ship supporting

structure, thrust bearing, as well as shell openings and local

reinforcements, are to be submitted for examination.

The pressure in water jet ducts, the forces and moments

induced by the water jet to the ship structure and the calcu-

lation procedure from the designer are to be specified.

In no case the scantlings are to be taken less than the

requirements defined in:

• the present Rule Note, for the surrounding hull structure

• NR396 Rules for the Classification of High Speed Craft,

Ch 3, C3.9.2. In this case, the minimum rule safety fac-

tors to take into account for the structure check, as

defined in Sec 2, [1.3], are to be the same than those

considered for the hull bottom structure.

11.6 Foils and trim supports

11.6.1 Foils and trim tab supports are not covered within

the scope of classification and/or certification.

Forces and moments induced by these elements, as well as

the designer calculation, are to be submitted for the exami-

nation of the surrounding ship structure reinforcements.

As a general rule, attachment structure of foils to the ship

structure are to be located within watertight compartments

or equivalent.

11.7 Propeller shaft bracket

11.7.1 Propeller shaft bracket scantlings are to be checked

by direct calculations, taking into account the forces acting

on shaft bracket as defined in the applicable requirements

of the Society Rules for the classification and/or certification

of ships (see Sec 1, [1.1.2]).

Where it is not specified otherwise, the safety factors to take

into account to check the shaft bracket scantling are those

defined in Sec 2, [1.3], increased by a coefficient to be

taken at least equal to:

• 1,8 for the main stress safety factor

• 1,5 for the combined stress safety factor.

11.8 Lifting appliances

11.8.1 As a rule, the permanently fixed parts of lifting

appliances fitted into the hull, as well as the associated

local reinforcements, are considered as integral part of the

hull and are to be checked as defined in the Society Rules

for the classification and/or certification of ships (see Sec 1,

[1.1.2]).

Local reinforcements and hull structure surrounding the

crane pedestal are to be checked by direct calculations, tak-

ing into account the safety factors defined in Sec 2, [1.3].

11.9 Equipment in chain and anchor

11.9.1 The equipment in anchors and chains is to be as

defined in the applicable Society Rules for the classification

and/or certification of ships (see Sec 1, [1.1.2]) in relation of

the navigation notation or service notation granted to the

ship.

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