Abstract
ACT TOWER, ACT CITY HAMAMATSU, has a large setback at a height of 120m, where the hotel lies over the office part . There are three main themes in the structural design. The first is the solution to use a Super truss for the framing of the setback part . The second is that the site is located in a very high seismic area. Evaluated earthquake waves are made considering this, and the design is checked. And the third is the wind resistant design. It is confirmed that the building behavior is almost elastic for the case of a storm in 500 years return period. Semi-active mass dampers are set up to improve comfortability for the case of strong winds within a year.
