ABSTRACTS:

This paper presents the analysis results for the severe failure in the side shell plate of no. 1 cargo hold and In the forebody structure of a Gondola type ore/bulk carrier of 180K class with large flare occurred during her voyage through the rough sea state of Beaufort scale 8 to 9. It was revealed that there exist the stress concentration phenomena in the middle part of no. I cargo hold and in the forward top part of side shell plate due to the impact load in rough sea. It was concluded necessary to retain the continuity of longitudinal rigidity for the prevention of the stress concentration. Several designs of structural reinforcement to avoid the excessive stress concentrations on particular areas were considered and some structural modifications based on structural continuity are recommended.

1. INTRODUCTION

The subject ocean going vessel, of which the principal dimensions and the outline are shown in Table 1, was built in 1987 for ore and / or bulk cargoes. After about one year In service, she had met the severe weather of Beaufort scale 8 to 9 during her regular voyage In full load through Cape Town In South Africa, and was damaged on the side shell plates of no. I cargo hold and on the forepeak structure above the load water line She has been In service several times after partial repairs, but from the recent on-board survey It has been found that other cracks and dents have been propagated to adjacent areas from initial damages. The damages might be inferred to be due to the impact loads Induced by bow slamming from the fact that most damages occured above the load water line and the vessel has considerably large flared bow structure.

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