Graduate Thesis Or Dissertation

 

Aseismic performance of a cable-stayed structure with decentralized H[infinity] control Público Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fx719q002

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  • The dissertation uses state-of-the-art structural engineering theories, in parallel with the modern and still-developing control theory of electrical engineering to mitigate the vibratory responses of a double-stayed bridge subjected to strong earthquake ground motions. First, a nonlinear finite element model of the double-stayed bridge subjected to non-uniform (multi-support) earthquake excitations is developed. The model incorporates the nonlinearities from the sagging of the cables and the effects of axial forces in the members. Next, the static behaviours as well as the uncontrolled responses of this bridge subjected to three different earthquakes are studied and the effects of variations in some of the system parameters and dimensions are examined. Finally, four decentralized controllers are proposed to protect the structure from the earthquake hazard. The scheme introduced is an Algebraic-Riccati-Equation-based (ARE-based) decentralized H∞ control strategy. Under this scheme, controllers at only four discrete points on the deck of the structure are used. With these controllers, the overall performance is analyzed and its effectiveness is evaluated and discussed.
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  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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