Chapter 4 - Scantling of Ship's Hulls by Rules

Abstract

This chapter discusses scantling of ship's Hulls by rules. The term “scantling” refers to the determination of geometrical dimensions,such as wall thickness and sectional modules for a structural component or system. The initial scantling design is one of the most important and challenging tasks throughout the process of structural design. After signing the contract, scantling design is the next step and continues throughout the design process until the design is approved by the owner, the shipyard, the classification society, and other maritime authorities. Hull form, design parameters for auxiliary systems, structural scantlings, and final compartmentation are decided on, during the initial design phase. This chapter introduces the design equations for tankers based on IACS (International Association of Classification Societies) requirements and classification rules. This chapter discusses the basic concepts of stability and strength of ships along with corrosion allowance. This chapter also explains the initial scantling criteria for longitudinal strength. In order to assess the structural strength of the ship, the minimum basic scantlings, which depend on the expected loads, must be determined. It also explains hull girder strength, initial scantling criteria for transverse strength. The initial scantling criteria for local strength are also explained. The buckling of platings is also discussed in this chapter. Buckling is one of the main concerns in structural design. This section discusses the scantling of longitudinal members with respect to the buckling control by considering the total compressive stresses.