The Tokyo sky tree is supported by the pile group foundation using under-reamed diaphragm-wall-type piles with different sizes. This report describes the outline of the foundation design, the evaluation method in design of the effect of pile group and the analytical results of FEM. The results of this study are shown as follows: (1) The pile group efficiency is 0.58, 0.49 and 0.68-0.73 respectively under pushing, pulling and lateral load. (2) In case of the lateral loading, the pile group efficiency changed according to the direction of the load and the position of the piles.
SUMMARYThis paper describes an along-wind vibration of frame-type pylons of Hakucho Suspension Bridge found from longterm vibration monitoring data. It is shown that the vibration is very harmonic although its amplitude is small and it occurs under certain ranges of wind direction (10~30 degree from the bridge perpendicular axis) and of wind velocity (13~25 m/s). The dominant frequency of the vibration is either 0.6 Hz or 0.8 Hz depending on the wind velocity and these correspond to the natural frequencies of the in-plane pylon dominant modes of the suspension bridge. A series of the wind tunnel experiments using a spring-supported scaled model are conducted under uniform flow and the alongwind pylon vibration was observed and its vibration characteristics is found to be consistent to those observed in Hakucho Bridge. It is also found that the vibration is very sensitive to the incident angle of wind and to the distance between the two columns.key words: suspension bridge, in-plane oscillation, vortex induced vibration, wind tunnel experiment --
SUMMARYThis paper describes the structural design of TOKYO SKYTREE ® which was completed in May last year. This tower is the world's highest freestanding steel tower, and it was planned to be the central facility for digital broadcasts in the Tokyo area. Structures in Japan are required to be sufficiently safe against the severe natural environment of Japan, which include not only earthquakes but also typhoons. This tower is also to serve the important role of distributing information during disasters, so even more severe criteria were provided for its design.The following is an introduction to the structural design of TOKYO SKYTREE, which satisfies the strict design conditions using a unique The Core Column System, vibration control system.
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