This paper presents a selection method on the standard type of steel framed Sabo structure with filled materials. At first, the typical three types, i. e. truss type, semi-truss type and rahmen type have been designed by using the fully stress optimal design method. Herein, the interaction between frame and filled materials is considered in the optimal design method. Then, the required steel quantities of three types of Sabo structure are compared each other and the effects of stress ratio between axial force and bending moment are examined. Finally, the truss type structure has been selected as the standard type of Sabo structure from the economical and rational points of view.
For the purpose of studying mechanism of the transformation from rotational momentum to linear momentum on the collision, the kinematical theory of collision of rigid body was tested in simple experiments with small elastic balls. The device of this study is the one in the guide tracks on the approaching slope. The width of the track is alterable to change the initial angular momentum of test ball. The validity of the theory is certified in the small scale experiments. But the difference between calculation and measurement is found in the strong collision because of elastic large deformation. More sophisticated methods will be applied to elucidation of impulse phenomena.
Protection in aprons of sabo dams is installed for the purpose of preventing scouring of the foundations by water falling from the waterway crown of the sabo dam, and to stabilize the level of the riverbed until the stream returns to the normal hydraulic state of river. In experimental research on the protection of aprons of the dams in the past, investigation was conducted under the condition that the crown of the counter dam is at the same elevation as the riverbed downstream, and the semi-theoretical applicability of the length of water hit and the height of the counter dam has been established. But ther are many sabo dams where the crown of the counter dam is situated higher than the riverbed. In this report, we will conduct an experiment that the riverbed is made the same height as the crown of the water hit, and the length of water hit and the height of counter dam are varied. The purpose being to determine an appropritate counter dam height and water hit lengh to balance the scouring downstream of counter dam.