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RISS 인기검색어
- 검색키워드
- 저자 : Ricles, James (검색결과 4 건)
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Real-time large-scale hybrid testing for seismic performance evaluation of smart structures
Mercan, Oya,Ricles, James,Sause, Richard,Marullo, Thomas Techno-Press 2008 Smart Structures and Systems, An International Jou Vol.4 No.5
Numerous devices exist for reducing or eliminating seismic damage to structures. These include passive dampers, semi-active dampers, and active control devices. The performance of structural systems with these devices has often been evaluated using numerical simulations. Experiments on structural systems with these devices, particularly at large-scale, are lacking. This paper describes a real-time hybrid testing facility that has been developed at the Lehigh University NEES Equipment Site. The facility enables real-time large-scale experiments to be performed on structural systems with rate-dependent devices, thereby permitting a more complete evaluation of the seismic performance of the devices and their effectiveness in seismic hazard reduction. The hardware and integrated control architecture for hybrid testing developed at the facility are presented. An application involving the use of passive elastomeric dampers in a three story moment resisting frame subjected to earthquake ground motions is presented. The experiment focused on a test structure consisting of the damper and diagonal bracing, which was coupled to a nonlinear analytical model of the remaining part of the structure (i.e., the moment resisting frame). A tracking indictor is used to track the actuator ability to achieve the command displacement during a test, enabling the quality of the test results to be assessed. An extension of the testbed to the real-time hybrid testing of smart structures with semi-active dampers is described.
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Modeling of composite MRFs with CFT columns and WF beams
Ricardo A. Herrera,Teerawut Muhummud,James M. Ricles,Richard SAuse 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.3
A vast amount of experimental and analytical research has been conducted related to the seismic behavior and performance of concrete filled steel tubular (CFT) columns. This research has resulted in a wealth of information on the component behavior. However, analytical and experimental data for structural systems with CFT columns is limited, and the well-known behavior of steel or concrete structures is assumed valid for designing these systems. This paper presents the development of an analytical model for nonlinear analysis of composite moment resisting frame (CFT-MRF) systems with CFT columns and steel wide-flange (WF) beams under seismic loading. The model integrates component models for steel WF beams, CFT columns, connections between CFT columns and WF beams, and CFT panel zones. These component models account for nonlinear behavior due to steel yielding and local buckling in the beams and columns, concrete cracking and crushing in the columns, and yielding of panel zones and connections. Component tests were used to validate the component models. The model for a CFT-MRF considers second order geometric effects from the gravity load bearing system using a lean-on column. The experimental results from the testing of a four-story CFT-MRF test structure are used as a benchmark to validate the modeling procedure. An analytical model of the test structure was created using the modeling procedure and imposeddisplacement analyses were used to reproduce the tests with the analytical model of the test structure. Good agreement was found at the global and local level. The model reproduced reasonably well the story shear-story drift response as well as the column, beam and connection moment-rotation response, but overpredicted the inelastic deformation of the panel zone.
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Evaluation and Redesign of the Inverted Decoupler: Open and Closedloop Approaches
Anna Paula V. de A. Aguiar,George Acioli Júnior,Péricles R. Barros 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
The inverted decoupler is usually designed from estimated process models. These models are usually of reduced order, so that effective decoupling is not always achieved. The redesign of decouplers is a subject that received little attention in literature. In this paper, the methodology for decoupler evaluation and redesign in openloop is reviewed. In addition, a new closed-loop evaluation and redesign methodology is presented. This is the main contribution of this paper. The initial decoupler is evaluated by applying a relay-based excitation signal to the decoupled process. If necessary, the decoupler is redesigned to obtain an effective decoupling at some frequencies of interest. Simulation results is used to illustrate the methodology.
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