Section 2 Primary steel support member arrangement
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Application of Sandwich Panel Construction to Ship Structure, July 2022 - Chapter 4 Design Basis and Scantling Determination of Primary Structure - Section 2 Primary steel support member arrangement

Section 2 Primary steel support member arrangement

Parent topic: Chapter 4 Design Basis and Scantling Determination of Primary Structure

2.1 General

2.1.1 The arrangement of the primary steel support members should be such as to:

  1. ensure an aspect ratio of the panel in the range from a/b = 1,2 to 1,7 can be maintained, where a is the longest side and b the shortest side; and

  2. the largest side of the panel is less than 3,6 m.

2.1.2 The spacing of the primary steel support member is in general to be as described in Ch 4, 2.1 General 2.1.1. The number of primary steel support members is to be such that an adequate aspect ratio of the supported steel sandwich panel can be maintained. Additional strengthening may be required in order to achieve the aspect ratio described in Ch 4, 2.1 General 2.1.1.

2.2 Design details

2.2.1 Typical connection details between the steel sandwich panels and primary supporting members are given in Ch 2, 5 Typical design details.

2.2.2 Primary steel support members are in general to be connected to both top and bottom plating.

2.2.3 The primary support members are to be arranged and designed with sufficient stiffness to provide support to the ship's structure. In general, primary support members are to be arranged in one plane to form continuous transverse rings. Connection between primary support members forming the ring are to be provided with brackets designed in accordance with the Rules and Regulations for the Classification of Ships, July 2022.

2.2.4 Connections between primary steel support members forming a ring system are to be designed so as to minimise stress concentrations at the junctions.

2.2.5 Primary steel support members are to have adequate lateral stability and web stiffening and the stiffening structure is to be arranged to minimise hard spots and other sources of stress concentrations.

2.2.6 Where primary steel support members are subject to concentrated loads, particularly if these loads are out of line with the member web, additional strengthening may be required.

2.2.7 Adequate transition brackets are to be fitted at the ends of effective continuous longitudinal primary steel members in the deck and bottom structures.

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