Feed-forward control of active variable stiffness systems for mitigating seismic hazard in structures

In this paper we discuss a practical two-stage approach (design and operation) to the seismic control of structures equipped with active variable stiffness (AVS) systems, as a means to mitigate or eliminate resonance or near-resonance phenomena in structures due to seismic ground motion. During the design stage, past seismic events are processed to extract the characteristic frequency content against which the AVS-equipped structure is designed, using a conventional envelope spectrum approach. The motivation for the operation stage builds upon advances in early-warning systems that hold the promise of delivering the expected ground motion waveforms at sites equipped with AVS and at instances just prior to the first wave arrival. The working hypothesis for the operation stage is that notification of the incoming motion will be served to the AVS-equipped site so as to allow for a small but sufficient window for moving the hydraulics of the AVS system to compensate for the frequency content of the arriving seismic signal. Numerical results are presented for both design and operation stages of a prototype building under real past seismic events.

[1]  Anil K. Chopra,et al.  Dynamics of Structures: Theory and Applications to Earthquake Engineering , 1995 .

[2]  Zexiang Li,et al.  Control of seismic-excited buildings using active variable stiffness systems , 1996 .

[3]  Takuji Kobori,et al.  Active variable stiffness system with non‐resonant control , 2001 .

[4]  Anil K. Agrawal,et al.  Semi-active hybrid control systems for nonlinear buildings against near-field earthquakes , 2002 .

[5]  David C. Nemir,et al.  Semiactive Motion Control Using Variable Stiffness , 1994 .

[6]  Robert D. Hanson,et al.  Electrorheological Dampers, Part I: Analysis and Design , 1996 .

[7]  Shirley J. Dyke,et al.  Benchmark problems in structural control: part I—Active Mass Driver system , 1998 .

[8]  Chin-Hsiung Loh,et al.  Control of seismically excited building structures using variable damper systems , 1996 .

[9]  T. T. Soong,et al.  Recent structural applications of active control technology , 1994 .

[10]  Satish Nagarajaiah.  Semi-Active Control of Structures , 1997 .

[11]  Takuji Kobori,et al.  Seismic response controlled structure with Active Variable Stiffness system , 1993 .

[12]  Kazuhiko Yamada,et al.  Control algorithm for estimating future responses of active variable stiffness structure , 1995 .

[13]  Kazuhiko Yamada,et al.  Evaluation of an active variable-damping structure , 1994 .

[14]  Michael C. Constantinou,et al.  Seismic testing of a building structure with a semi-active fluid damper control system , 1997 .

[15]  Shirley J. Dyke,et al.  Benchmark problems in structural control : Part II : Active tendon system , 1998 .

[16]  Faryar Jabbari,et al.  H∞ Control for Seismic-Excited Buildings with Acceleration Feedback , 1995 .

[17]  Jann N. Yang,et al.  Application of Optimal Control Theory to Civil Engineering Structures , 1975 .

[18]  Gary C. Hart,et al.  Simulation of artificial earthquakes , 1973 .

[19]  Haluk Aktan,et al.  Actively regulated friction slip braces , 1991 .

[20]  Ta-Liang Teng,et al.  A Virtual Subnetwork Approach to Earthquake Early Warning , 2002 .

[21]  Nicos Makris,et al.  Electrorheological fluid damper for seismic protection of structures , 1995, Smart Structures.

[22]  B. F. Spencer,et al.  Active Structural Control: Theory and Practice , 1992 .

[23]  Billie F. Spencer,et al.  Modeling and Control of Magnetorheological Dampers for Seismic Response Reduction , 1996 .

[24]  Shirley J. Dyke,et al.  PHENOMENOLOGICAL MODEL FOR MAGNETORHEOLOGICAL DAMPERS , 1997 .

[25]  Robert D. Hanson,et al.  Electrorheological Dampers, Part II: Testing and Modeling , 1996 .

[26]  R. Clough,et al.  Dynamics Of Structures , 1975 .

[27]  Mohamed Abdel-Rohman,et al.  Optimal Control of Civil Engineering Structures , 1980 .

[28]  J. N. Yang,et al.  Sliding Mode Control for Seismically Excited Linear Structures , 1995 .

[29]  Chunxiang Li,et al.  Active multiple tuned mass dampers for structures under the ground acceleration , 2002 .