竣工記録に基づいた事務所建物の寿命調査

抄録

This study is an estimation of office buildings lifetime from general contractors construction records. The method used here is based on the one developed by Kaplan and Meier, though some modification was applied in the data process. The results of the estimation are as follows; the lifetime, which we define as the time the remaining rate curve needs to reach 50%, of office buildings in the central area of Tokyo is about 40 years. The floor area of a building and its structural type have considerable affection to the lifetime. The wider the floor area is, the longer lifetime is. The steel construction buildings tend to have shorter life than those of reinforced concrete or similar construction.