In this paper, the author describes the behaviors of plate welded vertically with one-side stiffener in the buckling state, submitted to the action of shearing forces uniformly distributed along the edges combined with the straightly distributed forces. Especially for one-side stiffener its torsional resistance and the local contraction due to the eccentricity of the middle plane of plate from the sectional center line of stiffener should be considered as the most important factors. The author considers that factors and calculates the effective rigidity ratio of one-side stiffener for the expected loading conditions by the so-called energy method, and verifies the interesting behaviors which are shown in theoretical analysis by the experimental results.
Combining the equations of motion of fluid with the equation of continuity, the author solved numerically differential equations of flood-flow which is one kind of unsteady flows. The system of the flood flow under cosideration is nonlinear with a finite amplitude. In this paper, first, his method is justified by comparing calculated floods with observed floods.