木造専用住宅の寿命に関する調査研究 : 累積ハザード法による寿命推定

Abstract

This study is to estimate statisticaly the life time of Japanese wooden houses used exclusively for residence. Data sources are the ledgers prepared for the fixed property taxes, from which the numbers of remaining houses and demolished ones were took out in order of newly built year. Total of remaining houses are over 7 million. Using terms of reliability theory, the "probability density function of failure" is supposed to follow a logarithmic normal distribution from graphic analysis, and by the reliability function presumed, the life expectancy of Japanese wooden houses are estimated at some 48 years.