Study on Earthquake Damage Estimation of Wooden Houses Using Basic Survey of City Planning Data

Abstract

This study examines the accuracy of damage estimation on region mesh units by fragility curves, and the damage evaluation method of wooden houses using the basic survey of city planning data. To examine the accuracy using fragility curves, this study compares the results of damage estimation by the Nankai Trough earthquake targeting Toyohashi city between two cases; one is the case in which the average rate of wooden housed by age is applied to all the regional meshes in Toyohashi city from the housing and land survey data of Japan, and the other one is the case in which the actual distribution of wooden houses by age is applied to each regional mesh from the basic survey of city planning data. To evaluate the damage to wooden houses, the damage probability curve is calculated by incremental dynamic analysis using strong ground motion records that are selected from the K-NET and KiK-net database. And the damage evaluation of wooden houses in Toyohashi city by Nankai trough earthquake is evaluated using the damage probability curve and the basic survey of city planning data. As a result, damage estimation results reflecting actual building distribution represent the actual damage situation better than damage estimation results using the average rate of wooden houses. In addition, it is shown differences in damage by building within the same regional mesh on the map in the case of the Nankai Trough earthquake.