Now, a limit state design is not applied to reinforced concrete structure in Japan, the reason why the answers for tne shear failure behavior and load-deformation characteristics have not been yet obtained.
But in this paper, it is described the shear strength can be obtained in tolerable accuracy with the existing data to study by statistic-stocastical analysis and the means of kinematics theoretically.
And it is obsurved there are 2 kinds of the shear failure type, shear-compression and shear-bending (contained the bond failure), so the authors discussed that the 2 nd failure type is good for limit state design, and next, under those studies, the problems are caused of the present reinforced concrete structure standard of A. I. J.
At last, the semi-theoretical equation is led as to the deformation of beams and columns in shear and limit decision criteria between the 2 shear failure types are suggested.

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This study report is mentioned regarding the quality control of concrete used at Shintoyone Arch-Dam which was built by Electric Power Development Co. Ltd. on the Onyu, a tributary of the Tenryu River in Aichi prefecture.
In order to select the optimum mix proportion for arch dam, the specified mix was decided on the basis of the results obtained from tests of various mix proportion which combined aggregate, fly ash and some mixture agents.
In case of production control for concrete, the specifications keeping the umiformity of material quality in view point was strictly applied to control and check the quality of materials. And the concrete used these materials was producted under the control.
In the result of above mentioned, the quality of concrete was shown better than the specified one as follows ; 420kg/cm² for average compression stress and 8% for coefficient of variation.

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The volume change of concrete is caused by drying, temperature and external force. As the cause of concrete cracking, temperature change is not inferior to shrinkage.
The causes of temperature change of concrete are “Hydration of Cement” and “Change of atomospheric temperature”.
In this paper, theoretical study is presented, and the measured temperature of the concr-ete members at the diferent depth is compered with the theoretically calculated value, then, the following conclusions are obtained.
(1) The variation of temperature in the concrete can be explained by the temperature distribution equation introduced from the conduction theory with some exceptions.
(2) There is difference of the volume change among each part of concrete in full-scale rahmen cured in field.
(3) In some meteorological data, the variation of temperature of the air is most effective than the other factors on the variation of volume change at small interval (one day).

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