船楼上室壁エントランス損傷原因の一検討

概要

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Recently, in many ships, some cracks occurred at the corners of the entrance of house wall. The author considered this cause that, the house wall were subjected to the shearing strain by the difference of the displacements of upper and lower decks and so the large stresses occurred at the corners of the entrance. In order to calculate the shearing strain of the house wall he applied the theory published by W. Hovgaard mutatis mutandis and cleared that the fairly large stresses are possible to occur at the corners of the entrance. The cause of damages of this kind seems to be cleared by this analysis, although this analysis contains some assumptions about the effective area of deck plates, stress distribution in the bulwark plate etc..The counter-measures of damages of this kind are 1) to enlarge the radius of corners of the entrance as large as possible, 2) to design the situation of the entrance as far as possible from the end of superstructure, 3) to change the connections of house wall from weld to rivet in order to relieve the shearing strain of house wall, 4) to reinforce the corner parts of the entrance.