Compounding of Stresses in Ship Strength Members

Abstract

This chapter gives a full analysis of the compounding of stresses induced in the various ship strength members of transversely and longitudinally stiffened double bottom and deck structures. The compounding of stresses is carried out for the main ship strength members which includes girders, longitudinals and plating. The compounding of stresses induced in any strength member takes account of the primary, secondary and tertiary stresses. Depending on the location of the strength member in the ship structure, the primary stresses included in the compounding process of stresses are calculated when the ship is in sagging or hogging conditions. The compounding of stresses in tank top longitudinals and plating are also considered. The compounding of stresses of bottom plating takes account of the local stresses induced by the local loading of the external water pressure. The compounding of stresses are carried out at the locations expected to reveal the highest values of compound stresses. The strength members considered for the compounding process includes girders, longitudinals and plating in bottom and deck structures.