SURVEY ON REAL LIFE SPAN OF OFFICE BUILDING IN CHUUOU WARD OF TOKYO CITY

Abstract

Results of field survey on real life span of non-wooden structural building in central (Chuuou) ward of Tokyo city are reported here. Field data are collected from property tax ledger. Remainder rate R(t) is defined and applied here based on actual number of existing & demolished building by age. T_<0.5> is the year when R(t)=0.5 and is called "representative life" of the category. Through fitting to statistical distribution models, T_<0.5> of office building by steel structure is supposed to be between 23 and 29 years, while corresponding value of reinforced concrete structure seems to be between 32 and 45 years.