Improved estimation of building damage due to an earthquake based on vulnerability functions considering regional seismic capacity difference

为了提高地震房屋震害估计的准确性，基于地震诊断数据揭示了日本木屋抗震能力的地区差异，在此基础上提出了基于地震诊断结果和加速度反应谱的新的木屋易损性函数。它们采用了木屋抗震性能指标的概率密度函数，将其分为抗力指标和其他抗力退化指标。根据加速度反应谱和由抗力指数确定的自然周期来评估输入地震运动，并将其在1995年兵库县南部地震中的应用结果与5个有地震记录的场地的破坏统计进行了比较。虽然拟议的脆弱性函数不是基于损失统计数据，但估计的损失率与地方政府调查的实际损失相当吻合。

In order to improve estimation accuracy of building damage due to an earthquake, the regional difference of seismic capacity of wooden houses in Japan is revealed based on the seismic diagnosis data.Based on the above result, the new vulnerability functions of wooden houses, which use the results of seismic diagnosis and an acceleration response spectrum, are proposed. They employ a probability density function of seismic performance indices of wooden houses, which are separated into an index of the resistance force and other indices regarding the degradation of resistance force. The input seismic motion is evaluated based on an acceleration response spectrum and natural periods determined by the indices of resistance force.The application results to the 1995 Hyogo-ken Nanbu earthquake are compared with the damage statistics at the five sites, which have seismic records. Though the proposed vulnerability functions are not based on the damage statistics, the estimated damage ratios coincide fairly well with the actual damage surveyed by local governments.