Building Collapse Risk Assessment and Risk Reduction Effect due to Removal of Vacant Houses in Kawasaki City

Abstract

Currently, the population of Kawasaki City is increasing, but it is predicted that it will reach its peak in 2030 and then decrease. Firstly, this paper quantitatively evaluates current regional building collapse risk of the city based on building inventory and ground amplification ratio and finds vulnerable districts which should be considered disaster risk reduction countermeasures. Then, it analyzes regional population trend using population data (1980-2055). Finally, it clarifies risk reduction effect due to removal of vacant houses in the 11 most vulnerable districts with Rank-5 of building collapse risk value.