Title:
Satsukita 8.1
Author(s):
Satoshi Tatsuno
Publication:
Web Session
Volume:
ws_F25_SatoshiTasuno.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/26/2025
Abstract:
Satsukita 8.1 is the tallest skyscraper in Hokkaido with 48 floors and a height of about 175 m (575 ft).The high-rise houses were constructed of reinforced concrete to ensure habitability during strong winds and earthquakes. Hokkaido has a lot of snow, so construction work is restricted in winter. To shorten the construction period, it was necessary to use precast members for the entire building. The construction method of this building was an RC layered construction method, and all columns on the first basement floor or higher were fully precast members. Beams, slabs, balconies, and corridors on the second floor and above were made of half-precast members. About 65% of the concrete is precast members. We have developed a hinge relocation method, which is our original structural design technology, and applied it to a skyscraper for the first time. By adopting this construction method, even in the event of a large earthquake, damage to the beam-column joints can be suppressed, so that the performance of the structural frame is improved. In addition, the feature of this hinge relocation method is that a mechanical re-bar joint can be installed at the end of the girder near the column surface, so that the precast column with the beam-column joint and the precast girder can be separated. By standardizing the cross-section of precast members, it became possible to reuse steel formwork multiple times for precast members made at the factory, and the total amount of formwork was reduced. In addition, we contributed to reducing the environmental impact by using concrete materials from Hokkaido as much as possible and manufacturing precast materials at a factory near the construction site and transporting them to the site.