Here, the auther indicates analytical treatments of the flow overfalling dams, using the formulas he has past developed for the steady flow in open channels, considering the effects of vertical curvature. And, he discussed the position control section occured near the crest of overflow spillway, which has controling, effects for the nappe shape and coefficient of overflow.
Numerical examples is also indicated for Naruko arch dam overfall spillway to show the results of this theory.

View full abstract

In order to figure out the values in dynamic states of bridge piers by the theory of vibrations, quite elaborate computations are required. If they are obtainable by adding a certain quantity to the static computed values the computations may become much simpler and easier. In this paper the author remarked an additional coefficient of vibrations D and studied it basing on practical data of the earthquake-proof computations of bridge piers. First, using an analog computer he obtained the transient solutions of a fundamental vibration of bridge piers under an assumed design earthquake motion: single cosine wave motion. He, then, applied some statistical considerations to the results above given an defined D_d which can be used in the practeial design of earthquake-proof constructions.

View full abstract

This paper is an analytical approach to the sedimentation problems above a weir. Variations in sand bed profile above a weir were calculated analytically by characteristic curve method, proposed by Assist. Prof. Y. Iwagaki, Kyoto University, in the case of rectangular channel supplied with constant discharge from upstream. In order to support the above mentioned analysis, some investigations in an experimental flume were practised.

View full abstract

This paper expands K. Kiess's investigation of “endliche Fourier Transformation” to the beiharmonic differential equation by means of Green's formula for the same equation, and gives the solution for the bending of the rectangular plate on elastic subgrade, whose four sides and corners are completely free from any stress.

View full abstract

This paper contains the design procedure of the Takashima Pier No. 3, a large scale pier on the deep soft alluvium, depth of ten meters below L. W. L., the surcharge of 3.0t/m², and also designed so as to resist for seismic forces. The pier had been to be constructed on the soft clay strata of more than thirty meters thick. The magnitude of the cohesion assumed in this design of the foundation decided by the following methods, namely, the performance of unconfined compression tests of undisturbed samples, results of loading tests of piles at the construction site and the analysis of the existing structures near the construction site. The depth and inclination of the hard pan under the soft clay strata were found by the results of boring, pile driving and seismic prospecting. Following to the results of these studies, framed caissons on the friction piles were adapted as the main structure of the pier.

View full abstract

The dynamic behaviour of the bridges under the force of moving load is of great importance. Many engineers have investigated this problem in the case of the simple beam, and they could analyse almost perfectly this case. In the highway plate girder bridges, we can not see them as beam, but from many experimental stress analysis, it can be said that the highway plate girder bridges can be thought as the orthotropic rectangular plate. Taking the idea that the moving load on a rectangular plate is the load travelling on the distributed spring constants of different value, the authors obtained the fundamental equation and could determine the deflection curve of rectangular plate under a moving load.

View full abstract

In this paper, the mathematical toeory on progressive translation waves of the permanent type is developed. The treatment of the second approximation based upon the momentum and energy approaches considering the effects of the vertical acceleration shows that the surface profile of waves is expressed in terms of an elliptic function which is designated as the cn-function, the name cnoidal being derived therefrom as analogous to sinusoidal, and the solitary wave is included as a special case of the cnoidal wave. It should be noticed that the behaviour of cnoidal waves may be reduced to that of classical sinusoidal waves at a special limiting case.

View full abstract

In this paper, we have considered the variations of unit hydrograph resulted from the variations of areal and hourly distributions of rainfall in Japanese river basins, and proposed a method to make clear the effects of the variations of rainfall conditions on the unit hydrograph.
Applying the method, as proposed herein, to the YURA RIVER, we obtained such satisfactory results as it would be able to suggest many noticable points about the application of unit hydrograph method to Japanese rivers.

View full abstract