Hybrid control of seismic‐excited bridge structures

Yang, Jann N.; Wu, Jong-Cheng; Kawashima, Koichiro; Unjoh, Shigeki

doi:10.1002/eqe.4290241103

Cited by 106 publications

(52 citation statements)

References 4 publications

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“…Subsequently, many numerical studies were conducted by applying different control algorithms or employing different active control devices or isolation bearings into systems (Yang et al 1992;Soong and Reinhorn 1993;Feng 1993;Yang and Vongchavalitkul 1994;Yoshida et al 1994;Barbat et al 1995;Yang et al 1995;Fur et al 1996;Loh and Chao 1996a;Loh and Ma 1996b;Lee-Galuser et al 1997;Sener and Utku 1998). In these studies, the classic linear-quadratic-regulation control algorithm and the Lyapunov control algorithm were used most often (Inaudi and Kelly 1990;Pu and Kelly 1991;Loh and Chao 1996a;Yang et al 1992;Loh and Ma 1996b;Fur et al 1996).…”

Section: Active Base Isolationmentioning

confidence: 99%

“…In these studies, the classic linear-quadratic-regulation control algorithm and the Lyapunov control algorithm were used most often (Inaudi and Kelly 1990;Pu and Kelly 1991;Loh and Chao 1996a;Yang et al 1992;Loh and Ma 1996b;Fur et al 1996). Some researchers focused on the numerical analysis of different isolation bearings, such as rubber bearings or sliding bearings (Yang et al 1995;Feng 1993). Due to the complexity of the active control part in the active base isolation, some researchers investigated the realization of the active control loop, including the time delay or the uncertainties of the sensor measurements (Pu and Kelly 1991;Senser and Utku 1998;Barbat et al 1995).…”

Section: Active Base Isolationmentioning

confidence: 99%

“…Due to the complexity of the active control part in the active base isolation, some researchers investigated the realization of the active control loop, including the time delay or the uncertainties of the sensor measurements (Pu and Kelly 1991;Senser and Utku 1998;Barbat et al 1995). Nonlinear behaviors inherently involved in the isolation bearings were also explored in some studies (Barbat et al 1995;Yang et al 1995). Different active control devices, such as active tuned mass dampers or active vibration absorbers (different from hydraulic actuators), were also considered (Loh and Chao 1996a;Lee-Galuser et al 1997).…”

Section: Active Base Isolationmentioning

confidence: 99%

“…Different active control devices, such as active tuned mass dampers or active vibration absorbers (different from hydraulic actuators), were also considered (Loh and Chao 1996a;Lee-Galuser et al 1997). Some studies also applied the idea to bridge structures in which the active isolation systems were placed between the deck and the piers (Reinhorn and Riley 1994;Yang et al 1995;Park et al 2003;Park et al 2005). Although many numerical studies have been conducted in the research of active base isolation systems, few experiments were conducted during this time.…”

Section: Active Base Isolationmentioning

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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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: Active Base Isolationmentioning

confidence: 99%

Section: Active Base Isolationmentioning

confidence: 99%

Section: Active Base Isolationmentioning

confidence: 99%

Section: Active Base Isolationmentioning

confidence: 99%

See 2 more Smart Citations

Multiaxial active isolation for seismic protection of buildings

Chang

Spencer

Shi

2013

Struct. Control Health Monit.

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“…Several researchers have studied passive, active and semiactive control of base-isolated structures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]37,43]. However, the relative merits of these active and semiactive controllers, as applied to base-isolated structures, has not been investigated by careful comparison on a well-defined benchmark problem.…”

Section: Introductionmentioning

confidence: 99%

Smart base-isolated benchmark building. Part I: problem definition

Narasimhan

Nagarajaiah

Johnson

et al. 2006

Struct. Control Health Monit.

205

181

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SUMMARYSample controllers for a three-dimensional smart base-isolated building benchmark problem with linear and frictional isolation system are presented in this paper. A Kalman filter is used to estimate the states based on absolute acceleration measurements. Input filters are used to better inform the controller of the spectral content of the earthquake excitations. A reduced order control-oriented model of the benchmark structure with a linear isolation system is developed. A H 2 /linear quadratic Gaussian controller is presented for the active case; additionally, a clipped optimal controller is presented for the semiactive case. A preliminary 'skyhook' semiactive controller is also presented for the benchmark problem. Magnetorheological fluid dampers are used for control in the semiactive case and ideal actuators are used for control in the active case. The focus of this phase I study is on the linear isolation system only. Computed results for the passive, semiactive, and active cases are presented. Detailed comparisons of benchmark performance indices for base-isolated structures with a nominal linear isolation system, with and without control, for a set of strong near-field earthquakes are presented. The modeling and sample control designs demonstrated in this paper can be used to form the basis for studying a wide variety of active and semiactive control strategies}to be developed by the participants in the benchmark study}for linear base-isolated buildings.

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Sliding mode control with compensator for wind and seismic response control

Yang

Agrawal

et al. 1997

Earthquake Engng. Struct. Dyn.

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SUMMARYRecently, it has been demonstrated that control techniques based on sliding mode control (SMC) are robust and their performances are quite remarkable for applications to active/hybrid control of seismic-excited linear, non-linear or hysteretic civil engineering structures. In this paper, sliding mode control methods are further extended by introducing a compensator. The incorporation of a compensator provides (i) a convenient way of making trade-offs between control efforts and specific response quantities of the structure through the use of linear quadratic optimal control theory, and (ii) a convenient design procedure for static output feedback controllers to facilitate practical implementations of control systems. Since civil engineering structures generally involve excessive degrees of freedom, a controller design based on a full-order system may be difficult, in particular for wind-excited tall buildings. In this paper, three reduced-order control methods have been used and their performances have been investigated. Applications of sliding mode control with compensators to active control of buildings subject to either earthquakes or strong wind gusts have been demonstrated through numerical simulations. Simulation results show that the performance of the sliding mode controller with compensators for the reduced-order system is quite close to that of the controller based on the full-order system as long as enough vibrational modes are taken into account in the reduced-order system.

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Hybrid control of seismic‐excited bridge structures

Cited by 106 publications

References 4 publications

Multiaxial active isolation for seismic protection of buildings

Multiaxial active isolation for seismic protection of buildings

Smart base-isolated benchmark building. Part I: problem definition

Sliding mode control with compensator for wind and seismic response control

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