補強材の最小剛比について

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In this paper, a theoretical investigation into the effectiveness of a stiffener which is provided on a square plate simply supported along all edges is carried out. Both analyses on buckling and ultimate strengths of stiffened plates which are subjected to thrust are con-ducted by the finite element method. In buckling of a stiffened plate, it is well known that there is the minimum stiffness ratio of the stiffener, γ^B_<min>. If the value of the stiffness ratio of the stiffener,γ, is smaller thanγ^B_<min>, the buckling of the stiffened plate is over all and if γ is greater thanγ^B_<min> local buckling of the plate occurs. Concerning ultimate strength of a stiffened plate, it is found that there are two significant stiffness ratios of the stiffener,γ^U_<low> andγ^U_<min>, which are smaller and larger than γ^B_<min>' respectively. If the stiffness ratio is larger than γ^U_<low> and smaller thanγ^B_<min>' the ultimate strength of the stiffened plate which was subjected to over all buckling shows the local maximum. If is larger than^U_<min>, the ultimate strength of the stiffened plate reaches the maximum value and it is no use to provide a stiffener of whichis greater than^U_<min>' Influence of initial imperfection of the stiffened plate is also studied upon the ultimate strength.
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