A Study on the Stiffener of the Watertight Bulkhead of the Fishing Boat.

강제어선(鋼製漁船)의 수밀격벽(水密隔璧) 방요재(防撓材)에 관(關)한 연구(硏究)

The objects of this paper are to stimulated discussion of the criteria used for deciding the scantling of watertight bulkhead stiffener of steel fishing boats ranged of length of 20 meters to 80 meters and to suggest a method of calculation based on beam theory. Present knowledge is examined and it appears that failure of a bulkhead stiffener is comparatively rare. Regarding its structure bulkhead does not contribute on longitudinal strength of a ship. The strength of a bulkhead stiffener can be treated locally. Assuming bulkhead stiffeners are free ends and fixed ends theoretical required section modulus are calculated and compared with classification societies' rule. Welding effect of a bulkhead stiffener to bulkhead plate and a bracket to stiffener and deck plate are considered. On various conditions of joints are suggested.