| 摘要: | 台灣位於地震活動性高的區域，歷年來造成嚴重的人員與財產損失，例如2016年的美濃地震及2018年的花蓮地震。鑒於此，中央氣象局於全台灣設置了八百多部地震測站，收集大量的地動觀測資料，作為地震研究之重要數據來源。本研究採用這些地動紀錄，建立以台灣重大地震為主的地動數據庫。
目前世界上被最廣泛使用的地動數據庫是由太平洋地震科學研究中心（Pacific Earthquake Engineering Research center, PEER）所建立的，可藉由給定之反應譜（response spectrum）搜尋地動數據，而本研究所開發的地動數據庫，則能讓使用者依據累積絕對速度（CAV）進行搜尋。與最大地動加速度（PGA）及愛氏震度（Arias intensity, AI）相比，CAV是較新的地動強度量值，其計算包含完整記錄歷時的所有振幅，許多研究顯示，相較於不考慮地動持續時間的PGA，CAV更適合當作結構損壞的指標參數，此外還有變化版本CAVthreshold。本數據庫提供1327筆強地動數據，可依據感興趣的強度量值搜尋，作為後續研究之參考數據。
本研究提出八種強度量值之間的回歸關係，各強度量值基本呈現正相關性。再者，以CAV與CAVthreshold為主要參數，應用於2016年美濃地震與2018年花蓮地震之建物震損門檻值，及以ABAQUS數值模擬RC結構模型之六樓位移量。兩種結果皆顯示，CAV與CAVthreshold皆與建物損壞程度具有更好的相關性，而研究結果之CAV門檻值，可作為數據庫中地動的搜尋條件，用於未來研究之輸入數據。
;The region around Taiwan is known for high seismicity, which has caused serious losses over the years, such as the 2016 southern Taiwan earthquake and 2018 Hualien earthquake. As a result, Central Weather Bureau (CWB) has set up more than 800 seismic stations scattering in Taiwan and obtained a number of original earthquake records. In this study, we used these records to establish a ground motion database.
The ground motion database developed by Pacific Earthquake Engineering Research center (PEER) is most commonly used nowadays, and the key input is a target response spectrum. Our ground motion database allows users to search for ground motions with a given cumulative absolute velocity (CAV). In contrast to peak ground acceleration (PGA) and Arias intensity (AI), CAV is a relatively new intensity measure, which is dependent on the whole duration of the ground motion. Recently, many studies have shown that CAV and the variants with acceleration threshold, CAVthreshold, are more indicative of structure damage than PGA. The database in this study provides 1327 strong ground motions, which can be adopted in the following research.
According to the ground motion data, the regressions between intensity measures reveal positive correlations. In addition, the database can be applied on structure damage thresholds of CAVs in the 2016 southern Taiwan earthquake and 2018 Hualien earthquake, and as input data in the model deformation simulation utilizing ABAQUS. Both results show that CAV and CAVthreshold have obvious correlations with structure damage. Furthermore, the CAV thresholds of results can be the searching values in the database, and the corresponding ground motion data are inputs of the numerical simulation or experiment. |
