波浪中航走船体たわみと船体断面の2次モーメント値について

抄録

As well known, steel merchant ships are restricted its hull girder deflection as 1/1,000 of length by the regurations of the Clasification Society of Shippings. For example, large aluminume ship's hull girder deflections are limited as 1.7 times of steel hull by Americal Bureau of Shipping, and 1.5 times of high tension steel destroyer hull by U.S. Navy. Author have introduced the design formulars of hull girder moment of inertia values for large F.R.P. and Wooden Minesweepers, and its deflection limit line well resembled to the plotted points of actual ship's hull girders. On the case of hull structure design, at first set the shell plate thickness by several formulars, and by of which calcurate the required moment of inertia values, then reinforce the hull girder structure of 0.4L midship if necessary. By this way, we may be able to dissipate the damage of hull structurs from sevelal unexpected coupled streses.