新北市樹林藝文大樓受震反應之研究

Study on the Earthquake Response of Shulin Art & Administrative Building in New Taipei City

鄭立輝(Cheng, Li-Hui)

《結構工程》 36卷4期 (2021/12) Pp. 85-115

https://doi.org/10.6849/SE.202112_36(4).0004

摘要

財團法人台灣建築中心為推廣建築物安全AI系統，在109年10月底選定新北市樹林藝文大樓B1F、6F與7F共安裝四部網路型三軸向地震儀，計劃自該年10月起進行連續三年的地震反應監測，本研究利用該套系統於109年12月10日與110年1月9日所蒐集的兩次地震事件紀錄利用三種不同系統識別方法進行分析，該棟建物由地震訊號識別出來的週期Tx、Ty分別為0.3秒與0.35秒，阻尼比約為4%，由於本大樓108年7月啟用，至109年12月即遇到4級震度之有感地震，故該次識別之振動週期可合理地視為勁度參數之初始值，並做為後續年度建物健康監測的比較依據。另本棟建物週期識別出來之結果，僅為現有耐震規範的經驗公式以及ETABS以純構架模式分析結果的1/3，因此本研究推論，目前一般業界常使用的分析程式，若僅針對構架系統進行建模，未將其他內外牆元件一併納入考量，所得動力分析結果與實際建物週期相較，有2～3倍的差異；此外，若以識別出來的週期套用靜力分析公式進行本大樓耐震設計，所算出之設計橫力超出目前規範建議的經驗公式設計值約10%，顯示若依現有規範公式計算的設計地震力在建物週期的推估是否合宜須更進一步探討。

關鍵字

系統識別 ； 地震反應 ； 健康監測 ； 振動週期 ； 建物週期

並列摘要

For promoting the building safety AI system, Taiwan Architecture & Building Center installed an earthquake monitoring system including four tri-axial seismometers and a host computer in Shulin Art & Administrative Building in New Taipei City for health monitoring in October, 2020. Earthquake response data of the building will be collected by the system in the following consecutive three years. The research is based on the data recorded from the earthquakes on Dec.10, 2020 and Jan. 09, 2021 in North Taiwan. By system identification methods, the periods of the building are 0.3 second in X direction and 0.35 second in Y direction while the results of damping ratio are about 3%~5%. Since the building was just finished in July 2019, the identification results from the above earthquake records can be regarded as the initial properties of the structural stiffness which could be the reference for the building health monitoring in the future. In addition, the identified periods of the studied building are only 1/3 of both the empirical equation of Taiwan's earthquake designing code and dynamic analysis of ETABS base on a mere RC frame model assumption. Thus, the research infers that, without taking the inner and outer walls into analysis consideration, the estimation of building periods will be much different from the actual values. Furthermore, in the studied building, the designing earthquake forces based on the empirical period equation might be less 10% than the forces based on the periods given from the identification results. In the result, the research proposes that the relationship between the periods and building categories shall be studied more thoroughly.

並列關鍵字

system identification ； earthquake response ； building health monitoring ； vibration period ； building period