This articl presents formulae for the easy solution by the slope deflection method of problems involving rectangular plates simply supported on two sides and on the other 2 sides by elastic beams and supporting a vertical load.

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It is demonstrated here that the general form of the Airy Stress Function in 2-dim nsional elassic theory can be led to a simpler form by using an arbitrary harmonic function. H nce, to look for the Airy function satisfying the given boundary conditions can be led to a simple application of Dirichiet's problem or Neumann's problem on potential. Several si ple calculation examples are added here for reference.

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This article explains the experiments and fundamental studies made on the fatigue strength and the life of a metal structure r ceivirig repeated stress

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Dead water at the corner of sand settling basin create turbulence and reduces the efficiency of sand removal. Many attempts have been made to determine the proper curvature to avoid reduction in efficiency. The article, written from the hydrodynamical point of view, considers the influence of curvature with 2-dimensional potential flow from a single orifice. Wall friction and viscosity are neglected. These assumptions are far from actual flow in the basin, but this article will give us many important suggestions on the problems of sand settling basin.

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For the computation of buckling stress of rectangular plate, the energy method is quite often used. This is suitable to case of plates simply supported on 4 sides, but is inconvenient in other cases. When a rectangular plate with stiffeners is simply supported on 2 sides perpendicular to the compression direction and has various boundary conditions on the other 2 sides, the integration by R. Barbre is available. But this calculation is very difficult, because the number of columns and rows of determinant which expresses the boundary conditions is large. The writer has successfully derived a new formula based upon the slope deflection method which simplifies the calculation.

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The writer shows several new solutions on Slade-type distribution……one of the fundamental distributions at the determination of the continuous curve in hydrological statistics……examining systematically its various nonsymmetries and comparing with old theories.

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This article explains in order the basis of the plastic theory which has been experimented by many laboratory workers and research students, being considered more reasonable than the breaking theory of a reinforced concrete member basing upon usual elastic theory. After all the writer demonstrated with examples that the plastic theory on breaking based on the relations between stresses andstrains of concrete is the best one. The plastic theory has seldom been applied to the T-beam. The writer proposed a formula on the T-beam and demonstrated its accuracy by laboratory experiments. He also presents a new solution avoiding the main weakness of the plastic theory……that is that it is an Ultimate Method, but not a Working Stress Method…….

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The writer states, that heretofore compression strength has been the Strength standard of dam concrete, but that the proper standard should be shearing strength (in relations to the normal pressure on the surface) in case of dam concrete where the stresses are 2-dimensional or 3-dimensional. He explains his own new examination method of shearing, pointing out that the usual theory and experiments on shearing strength is not applicable to dam concrete.

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Vibration is produced in the ballast when a train travels. The greater the velocity, the stronger the vibration. The writer defines the “Ballast Breaking Velocity” of the wheel on the track as that velocity of the train which produces an upward acceleration of the ballast equal to the downward acceleration of gravity. The article explains the theory and its development from experiments made in 1936.

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