Ultimate Transverse Bending Strength Analysis of a SWATH Ship

J. Ocean Eng. Technol. 1992;6(2):103-112.

SWATH선의 최종 횡굽힘강도 해석

박치모

울산대학교 조선 및 해양공학과

Keywords: SWATH Ship, Ultimate Transverse Bending Moment, Shear Lag Effect, Wide-Flange Beam, Beam-Column Approach

핵심용어: SWATH선, 최종 횡굽힘모우먼트, 전단지체효과, 광폭 플랜지보, 보 기둥 법

Abstract

The calculation method which takes into account the shear lag effects on the ultimate transverse bending moment of a SWATH(Small Waterplane Area Twin Hull) ship has been developed. In case of the ultimate bending strength analysis of conventional monohull ships and general box girder structures, the hypothesis that plane section remains plane after bending can be employed but not in the case of the structures having wide flange. For the ultimate bending strength analysis of such structures, a new method which can take into account the effect of shear lag on the ultimate bending strength has been developed by adopting more reasonable assumption that warping distortion of the section takes place inthe same way as the actual stress distribution. Finally, the proposed method has been applied to a a SWATH cross deck structure.