臺北市國小建築物地震災損評估

Seismic Damage Assessment of Elementary School Buildings in Taipei City

本研究利用地理資訊系統評估台北市國小所有的建築物在地震下可能的破壞狀態。本研究建置台北市139所國小及559棟學校建築物的資料，選定山腳斷層、宜蘭地區、花蓮地區為可能影響台北地區的震源，根據歷史地震資料決定四個設定地震之震源參數，並按照台北市場址微分區來決定國小場址的種類，然後利用加速度衰減公式與場址效應修正係數，計算台北市國小場址的最大地表加速度，另外利用台北市液化敏感類別圖，判斷台北市國小場址地表發生液化現象之程度，最後決定在設定地震作用下台北市國小所有的建築物因地表振動與土壤液化所引起的破壞狀態。本研究篩選出耐震能力有明顯不足之建築物，供政府相關單位作耐震補強決策的參考，以推動學校建築物耐震補強之工作。

This paper presents a seismic damage assessment of all elementary school buildings in Taipei City. First, we collect pertinent data on 139 elementary schools and 559 schools buildings. In this study, we consider four scenario earthquakes to occur on the Sanjiao fault or in the Yilan and Hualien area. At each school site, the peak ground acceleration (PGA) is estimated using an attenuation relation and a site amplification factor; the occurrence of liquefaction is evaluated based on the Taipei liquefaction potential map. The capacity of each school buildings is determined based on a fragility curve and building deficiencies identified from a school survey. We determine the damage state of each school building caused by the scenario earthquakes and then identify most vulnerable school buildings. This study may provide a useful resource for school authority to make decision on seismic retrofit of elementary school buildings in Taipei City.