Examples of Greatly Damaged High-Rises
One of the Kobe City Hall buildings, which was the only super high-rise located in the area which experienced a tremendous tremor, suffered differential settlement of its foundation. Buildings in the Ashiyahama Seaside Town, Ashiya, had their steel pillars 50 cm square and of 5 cm thickness cut into two, despite the fact that housing constructions in the surrounding neighborhood received almost no damage. The safety of super high-rises was not clearly proved in the Great Hanshin Earthquake.
Danger inside the Building
A super high-rise is not adequate for residential use even if the structure is safe. According to research conducted by KITAURA Kahoru, professor at the Osaka City University, the higher the home was located in high-rises, the bigger the vibration the residents experienced. They hope to live on the lower floor. The percentage of the injured family members increases as the location of the home goes up from 5.6% on the low and medium floors to 14.1% on the high floors, and to 23.2% on the super high floors. The percentage of those who had great difficulty in evacuating was 34% of those on the low and medium floors, 40.2% on the high floors, while it was 52.9%, or over the half, of those on the very high floors.
Thus, the result of the research shows the inadequacy of high-rises for residential use in the time of disaster.
Horizontal crack in steel pillar of a super high-rise in the Ashiya-Hama Seaside Town