考慮結構物直接反應量測之外力識別研究

在結構健康監測及損害識別當中，作用在結構物上的外力扮演著重要的角色。因此，外力識別的技術被提出以了解作用在結構物上的外力。外力識別的演算法為外力識別技術的核心。本文中介紹了幾種外力識別的演算法，包含了修正回歸平方卡爾曼濾波器法(modified recursive square Kalman filter method)、未知外力卡爾曼濾波器法(unknown input Kalman filter method)、降階觀測器法(reduced order observer method)以及理論柏努力梁方法(heoretical Bernoulli beam method)。為了驗證這些外力識別演算法，本文中建立了四個模型來模擬不同的結構物及外力情況。此外，本文中也將外力識別的技術運用到了實際的案例及實驗當中。首先，外力識別技術被運用到簡支梁試驗當中來驗證外力識別技術的實用性。接著，一個六層樓的框構架被放置在振動台上進行震動試驗並從量測到的反驗來重建地震力。這個試驗驗證了外力識別技術於地震力識別的可行性。另外，廣州鐵塔(Canton tower)受Burma地震力作用的紀錄被運用來嘗試重建地震力。最後，本文中透過沖刷實驗並配合外力識別技術來了解擾動力並建立出波速、擾動力及沖刷深度三者的關係。

關鍵字

外力識別演算法；修正回歸平方卡爾曼濾波器法；未知外力卡爾曼濾波器法；降階觀測器法；理論柏努力梁方法；莫瑞森方程式；廣州鐵塔；沖刷

並列摘要

For purposes of monitoring and damage prognosis it is important to know the external loads which act on a structural system. Therefore, the force identification technique is developed for understanding the external loads. The force identification algorithm is the core among the force identification technique. In this paper, several force identification algorithms including modified recursive square Kalman filter method (MRLSKF), unknown input Kalman filter method (UIKF), reduced order observer method (ROOM) and the theoretical Bernoulli beam method (TBB) are introduced. Four simulated cases are used for verifying force identification algorithms. Also, the force identification technique is applied to experimental cases and real world cases. First a simply supported beam is set for proving the practicability of force identification technique. Second, a 6 floor frame structure by shaking table test is introduced for verifying that the force identification can be used in earthquake excitation case. Then, a real world case about the Canton tower under the Burma earthquake is introduced. In this case, the input force is tried to reconstruct by measurement response. Finally, a scouring experiment is applied to understand the turbulence force and establish the relationship among the wave velocity, turbulence force and the depth of scoring.

並列關鍵字

Force Identification Algorithm ； Modified Recursive Square Kalman Filter Method ； Unknown Input Kalman Filter Method ； Reduced Order Observer Method ； Theoretical Bernoulli Beam Method ； Morison equation ； Canton Tower ； Scour

參考文獻

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考慮結構物直接反應量測之外力識別研究

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