液状化の影響を考慮した簡便な木造家屋の被害分布予測

抄録

For predicting damage distribution of wooden house due to an earthquake, the simplified procedure which can take the effect of soil liquefaction into account, was proposed. The relation between peak ground velocity and damage ratio of wooden house was checked, using case histories at about 160 liquefied and non-liquefied sites during 10 Japanese major earthquakes. It was found that the damage ratio increases remarkably when soil liquefaction occurs at the ground whose geomorphological condition is reclaimed or drained land, natural levee, river channel, sand dune, or lowland between sand dunes. Therefore, two different relationships between peak ground velocity and damage ratio were defined for the case that soil liquefaction occurs at the above-mentioned ground and the other cases, respectively. Using these relationships, the distribution of peak ground velocity of an earthquake can be converted to the distribution of the damage ratio of wooden house. This procedure was applied to the 1931 Nishi-Saitama Earthquake and the 1923 Kanto Earthquake, and the results showed fairly good agreements with the reported damage distributions.