A comparative study in the semi-active control of isolated structures

Shook, D.; Lin, Pei Yang; Lin, Tzu-Kang; Roschke, Paul N.

doi:10.1088/0964-1726/16/4/058

Cited by 46 publications

(53 citation statements)

References 18 publications

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“…The semi-active devices replace the active devices in base isolation systems, providing a number of attractive features. Furthermore, a base-isolated building combined with two directional MR dampers has been experimentally evaluated against seismic excitations that proved the feasibility of this control combination (Shook et al 2007). While this approach has been evaluated experimentally, demonstrating the applicability of the semi-active isolation systems, the performance was found to be less than that of the corresponding active isolation systems.…”

Section: Motivationmentioning

confidence: 99%

“…In addition to active base isolation, other researchers have considered passive isolation systems combined with the controllable semi-active damping devices, such as MR dampers (Yoshioka et al 2002, Madden et al 2002, Sahasrabudhe and Nagarajaiah 2005a, and Shook et al 2007). The semi-active devices replace the active devices in base isolation systems, providing a number of attractive features.…”

Section: Motivationmentioning

confidence: 99%

“…Besides this benchmark control problem, Senser and Utku (1998) also investigated the dynamic behaviors of active base isolation systems in three-dimensional coordinates. Shook et al (2007) investigated a smart base isolation system for a simple SDOF structure using two MR dampers in the two perpendicular directions under bidirectional excitation. However, up until now, the out-of-plane behavior of active and semiactive controlled base isolation systems still lacks comprehensive study and experimental verification.…”

Section: Active Base Isolationmentioning

confidence: 99%

“…In the studies mentioned previously, the active control strategies encountered many difficulties including the time delay in the interface of the sensor measurements and the digital controller (Chung et al 1988;Soong and Reinhorn 1993;Quast et al 1995), understanding and modeling of the dynamic behavior of active control devices , feedback control with a robust algorithm and available measurements of structural responses (Spencer et al 1994;Dyke et al 1994a and1994b), control law realization by the digital controller (Dyke et al 1994b;Quast et al 1995). As for the planar motions of isolation bearings attached to the structures, only few experimental studies have considered the multi-directional excitations applying to the base isolated structures (Shook et al 2007); therefore, further studies with consideration of the out-ofplane motions should be investigated. Many studies have addressed that the supplemental damping devices for the isolation systems might improve the performance a little (Kelly 1999;Nagarajaiah and Ferrell 1999;Buckle et al 2002).…”

Section: Active Base Isolationmentioning

confidence: 99%

“…Yang et al (1996) and Riley et al (1998) employed sliding bearings using Teflon/stainless plates to isolate the superstructure. Shook et al (2007) employed a bi-directional roller-pendulum system with MR dampers to control a single-story frame. These bearings are all available options to be used in the experimental verification.…”

Section: Experimental Researchmentioning

confidence: 99%

See 4 more Smart Citations

Multiaxial active isolation for seismic protection of buildings

Chang

Spencer

Shi

2013

Struct. Control Health Monit.

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Structural control technology has been widely accepted as an effective means for the protection of structures against seismic hazards. Passive base isolation is one of the common structural control techniques used to enhance the performance of structures subjected to severe earthquake excitations. Isolation bearings employed at the base of a structure naturally increase its flexibility, but concurrently result in large base displacements. The combination of base isolation with active control, i.e., active base isolation, creates the possibility of achieving a balanced level of control performance, reducing both floor accelerations as well as base displacements. Many theoretical papers have been written by researchers regarding active base isolation, and a few experiments have been performed to verify these theories; however, challenges in appropriately scaling the structural system and modeling the complex nature of control-structure interaction have limited the applicability of these results. Moreover, most experiments only focus on the implementation of active base isolation under unidirectional excitations. Earthquakes are intrinsically multi-dimensional, resulting in out-of-plane responses, including torsional responses.Therefore, an active isolation system for buildings using multi-axial active control devices against multi-directional excitations must be considered.The focus of this dissertation is the development and experimental verification of active isolation strategies for multi-story buildings subjected to bi-directional earthquake loadings. First, a model building is designed to match the characteristics of a representative full-scale structure.The selected isolation bearings feature low friction and high vertical stiffness, providing stable behavior. In the context of the multi-dimensional response control, three, custom-manufactured actuators are employed to mitigate both in-plane and out-of-plane responses. To obtain a highiii fidelity model of the active isolation systems, a hybrid identification approach is used which combines the advantages of the lumped mass model and nonparametric methods. Controlstructure interaction (CSI) is also included in the identified model to further enhance the control authority. By employing the H 2 /LQG control algorithm, the controllers for the hydraulic actuators promise high performance and good robustness. The active isolation is found to possess the ability to reduce base displacements, as well as producing comparable accelerations over the passive isolation. The proposed active isolation strategies are validated experimentally for a sixstory building tested on the six degree-of-freedom shake table in the Smart Structures Technology Laboratory at the University of Illinois at Urbana-Champaign.iv ACKNOWLEDGMENTS

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Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Active Base Isolationmentioning

confidence: 99%

Section: Active Base Isolationmentioning

confidence: 99%

Section: Experimental Researchmentioning

confidence: 99%

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Multiaxial active isolation for seismic protection of buildings

Chang

Spencer

Shi

2013

Struct. Control Health Monit.

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Update of control parameters for semi‐actively controlled base‐isolated building to improve seismic performance

Kohiyama

Omura

Takahashi

et al. 2019

Japan Architectural Review

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The Sosokan building of Keio University located in Yokohama, Japan, is a base‐isolated building with a semi‐active control system. The semi‐active dampers’ damping coefficient is changed to best reproduce the optimal control force in linear‐quadratic‐gaussian control. However, the implemented control gain was calculated on the basis of the structural parameters applied at the design stage. In this study, we identified the building's actual structural parameters using observational records from the 2011 Tohoku earthquake. Using the updated structural model and 1000 simulated ground motions, we conducted a dynamic response analysis, which resulted in a fragility curve. Then, we evaluated the damage probability using the fragility curve and a seismic hazard curve. Finally, we determined the optimal control parameters to minimize the damage probability and used these parameters to implement the semi‐active control system.

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Efficient predictive vibration control of a building‐like structure

Enríquez-Zárate

Valencia‐Palomo

López‐Estrada

et al. 2019

Asian Journal of Control

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This paper presents the design of a model predictive controller (MPC) based on Laguerre functions for vibration control. The controller is tested in a building‐like structure consisting on a three‐story building with a passive vibration absorber. The structure is connected to an electromagnetic shaker, which excites the support of the superstructure, providing forces with a wide range of excitation frequencies, including some resonance frequencies of the structure. The overall controller is a hybrid vibration absorber conformed of (i) an active absorber, that is a predictive vibration control scheme, synthesised to actively attenuate the vibratory system response via (ii) a passive absorber, known as a tuned mass damper (TMD), located over the third story building to reduce the vibrations caused by harmonic forces acting on the base of the structure. The proposed predictive control strategy proves to be effective and efficient, improving system's performance with guaranteed stability and feasibility. Experimental and numerical results are included to illustrate the overall system performance.

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A comparative study in the semi-active control of isolated structures

Cited by 46 publications

References 18 publications

Multiaxial active isolation for seismic protection of buildings

Multiaxial active isolation for seismic protection of buildings

Update of control parameters for semi‐actively controlled base‐isolated building to improve seismic performance

Efficient predictive vibration control of a building‐like structure

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