SWATH선의 최종 횡굽힘강도에 대한 Shear Lag의 영향

Abstract

Shear Lag 현상을 고려하여 SWATH선의 최종 횡굽힘모우먼트를 계산하는 방법을 개발하였다. 종래의 Monohull선이나 Box Girder의 최종 굽힘강도 해석시에는 '변형전 평면이던 단면은 굽힘변형후에도 평면을 유지한다'는 단순한 보이론을 적용하였으나, 본 연구에서는 Shear lag에 의한 실제의 응력분포의 비율로 단면의 뒤틀림 (Warping)이 발생한다는 좀더 합리적인 가정을 도입하여 Shear Lag가 Wide-flange를 갑는 보의 최종 굽힘강도에 미치는 영향을 고려하는 방법을 개발하였으며, 이를 SWATH Model의 Cross Deck에 적용하였다.

A calculation method has been developed for the ultimate transverse bending moment of SWATH ship.

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 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 efect of shear lag on the ultimate bending strength has been developed by adopting more reasonable assumption that warping sistortion of the section takes place in the same way as the actual stress distribution.

finally, the proposed method has been applied to a SWATH cross deck structure.

A calculation method has been developed for the ultimate transverse bending moment of SWATH ship.

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 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 efect of shear lag on the ultimate bending strength has been developed by adopting more reasonable assumption that warping sistortion of the section takes place in the same way as the actual stress distribution.

finally, the proposed method has been applied to a SWATH cross deck structure.