Effect of ship section scantlings and transverse position of longitudinal bulkheads on shear stress distribution and shear carrying capacity of main hull girder

Article type: Research Article

Authors: Shama, M.A.

Affiliations: Naval Architecture Department, Faculty of Engineering, Alexandria University, Egypt

Abstract: The paper examines the effect of varying the different ship section parameters on the shear flow distribution and maximum shear stresses at the section neutral axis due to longitudinal vertical shear force. The contribution of the side longitudinal bulkheads to the shear carrying capacity of the main hull girder is also investigated. The analysis is limited to tankers having twin longitudinal bulkheads and is carried out in the form of a parametric study using the University IBM 1620 digital computer. The results are given in terms of ship depth, thickness of side shell plating and the applied shear force and are represented in tabular and graphical forms. It is concluded that the thickness of side longitudinal bulkhead plating has the major effect on the magnitude of the maximum shear stress in and the participation of the longitudinal bulkheads to the shear carrying capacity of the main hull girder. It is also concluded that the ratio of effective thickness of bottom plating to effecting thickness of side shell plating and the transverse position of side longitudinal bulkheads have an appreciable influence on the maximum shear stress and on the shear carrying capacity of the main hull girder. Further, it is shown that it is possible to determine, from a series of curves the maximum shear force or the relationship between ship section parameters that will not induce shear stresses greater than a maximum allowable value. A sample of these curves is given in the paper together with a numerical example.

DOI: 10.3233/ISP-1969-1618401

Journal: International Shipbuilding Progress, vol. 16, no. 184, pp. 357-369, 1969