Abstract
摘要:藉由俄羅斯科學院(GS RAS)的聯邦物探研究中心以及國家地震工程中心研究(NCREE)的研究人員參與,本計畫將使俄羅斯和台灣建立緊密的合作關係。計畫的主要工作項目包括:
1.建置大壩的結構數值模型,包括壩體健康狀態與損傷狀態,並產生大壩受到環境擾動和地震下之反應訊號。
2.進行大壩短期現地試驗,並進行系統識別,了解詳細的大壩動態特性。
3.研發從大壩附近測站萃取大壩動態特性的技術。
4.利用大壩受環境振動之反應訊號,研發基於樣本熵和跨樣本熵之技術以診斷大壩受損情形。
5.研發去除大壩受環境變化與操作條件變化而影響其動態特性的技術,因為上述變化將掩蓋大壩受損所造成之變化。
6.開發大壩安全監測軟體,可利用大壩平時的連續監測,判斷大壩結構是否異常。
在2017年,首先將根據實際情況和壩體特性,在俄羅斯和台灣各選一座大壩作為研究標的。選定的水壩經過管理單位核准後,將先建立數值模型,包括壩體健康狀態與損傷狀態,並產生大壩受到環境擾動和地震下之反應訊號。同時,並規劃進行一座大壩短期現地試驗,量測大壩受環境擾動下之振動反應。此外,根據駐波法等系統識別結果,驗證與調整大壩的數值模型。
在2018年,重點為利用第一年獲得的數據發展後續的技術,並進行另一座大壩同樣的數值模型建立、現地量測、系統識別與模型驗證等。此外,根據信號質量來選擇大壩附近的地震測站,並研發從大壩附近側站萃取大壩動態特性的技術,以及利用大壩受環境振動之反應訊號,研發基於樣本熵和跨樣本熵之技術以診斷大壩受損情形。
在2019年,根據在過去幾年期間大壩動態特性的長期監測結果,研發去除大壩受環境變化與操作條件變化而影響其動態特性的技術,開發大壩安全監測軟體,可利用大壩平時的連續監測,判斷大壩結構是否異常。最後,透過聯合研討會等方式進行研究成果討論與分享,以使得本合作研究計畫取得豐碩成果。
Abstract: This project will allow establishing tight relations and compact collaboration in new areas carried out both in Russia and Taiwan mainly consisting in participation of scientists from Federal Research Center Unified Geophysical Survey of the Russian Academy of Sciences (GS RAS) in joint research at National Center for Research on Earthquake Engineering (NCREE). The research tasks were drawn up together as follows:
Creation of selected dam structural models which can simulate disconnection of dam material to generate vibration signals of the dam under ambient disturbance and earthquakes both for intact and damaged dam conditions.
Filed campaign of operational vibration test on selected dams and coherent reconstruction of a hierarchical system of standing waves.
Development of technology to extract dynamic properties from measurement of seismometers in a distance from the dam.
Development of technology to detect damage using ambient vibration signals based on sample entropy and cross-sample entropy.
Development of methodology for accommodating operational conditions and environmental changes which may mask the variation of dynamic properties due to damage.
Development of software to detect abnormal behavior of dam structures using continuous monitoring of dynamic properties extracted from its ambient vibrations.
In 2017, both GS RAS and NCREE will join together to manage the joint project. First of all, dam structures in Russia and Taiwan will be selected based on availability and dam structure system and property. After the selected dams are approved by the authorities, a numerical model will be constructed using programs which can simulate disconnection of dam material. Vibration signals of the intact and damaged dams under ambient disturbance and earthquakes will then be generated. Meanwhile, the setup of filed campaign of operational vibration test on selected dams will be arranged. The coherent reconstruction of a hierarchical system of standing waves will be conducted using measured operational vibration signals. Finally, the numerical model of the dam will be verified using the standing waves identification results of the field campaign.
In 2018, it is planned to mainly develop methodology and technology based on the data obtained in the first year. Also, the same activities relating to dam-model construction, field campaign, and standing wave identification are planned to be conducted for another selected dam. Besides, the seismic station with seismometers in a distance from the dam will be selected based on signal quality. The technology to extract dynamic properties from measurement of the seismometers automatically will be developed based on standing wave identification results and signal processing process. Also, the technology to detect damage using ambient vibration signals based on sample entropy and cross-sample entropy will be developed.
In 2019, based on long-term monitoring of the dam dynamic properties during the past years, the methodology for accommodating operational conditions and environmental changes which may mask the variation of dynamic properties due to damage will be developed. As a result, a software to detect abnormal behavior of dam structures using continuous monitoring of dynamic properties extracted from its ambient vibrations will be constructed. In the end, the fruitful outcome of the joint project is planned to be harmonized and shared via a joint workshop.
Keyword(s)
大壩監測
結構健康診斷
系統識別
Dam Monitoring
Structural Health Monitoring
System identification