[in Japanese]

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This paper presents a theoretical consideration on the flutter wind velocity taking into an account the various structural parameters on the base of the theory developed by F. Bleich, which is originally concerned with the twodimensional air stream. We investigate here, to some extent, a few fundamental cases of the three dimensional wind velocity variations in the horizontal direction and its influence on the critical wind speed. Numerical illustrations are proceeded for the 1st plan of the proposed Akashi Straits Bridge and compared with the results by A. Selberg's empirical formula for corresponding torsional and deflectional characteristics of the proposed suspension bridge.

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In the first part of this paper, relationships between the angle of internal friction and the void in cases of axial symmetry and plane strain were derived by the theory of mechanics of granular material due to the present author.
With available data of shearing test on sand, the validity of these formulae mentioned above was examined, the results of which were satisfactory.
In the second part, experimental and theoretical study about the compression of one layered assemblage of steel balls randomly placed in a horizontal flat box was reported.
The phenomenon of spreading of compression area was explained fairly well by the theory and the observed values of pushing force of a wall showed good coincidence with those calculated by the theory. The theory presented by the author is based on statistical considerations following the same line of thought as in the previous paper.

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