Abstract
After studying demolished buildings and disaster waste quantities, we then estimated generation intensities in order to improve the accuracy of estimating disaster waste. Real data for the amount of segregated disaster waste debris from the 2016 Kumamoto Earthquake was recorded by Mashiki Municipality. We used this to sort the amount of debris derived from the demolished buildings. In addition, a building database was created that associated the existing identification, structure, number of floors, and total floor area of all buildings in Mashiki Town. Based on the relational expression between the total floor area of the demolished building and the actual debris amount data, the basic unit of disaster waste from the demolished building was estimated per total floor area by structure and composition. Findings showed that about 90% of the demolished buildings in Mashiki Town were wooden: the generation intensities were 0.57 (ton/m2) for wooden buildings with tiled roofs and 0.51 (ton/m2) for wooden buildings without tiled roofs. The basic unit estimation value and number of demolished buildings in this study were applied to the estimation formula for five neighbouring towns near Mashiki. We could assess the applicability of our study in the event of a future earthquake based on the fact that our estimated values were close to the actual data.
