1 / 29

16 th KKCNN Symposium on Civil Engineering Kyungju, Korea, December 8 - 10 , 200 3

16 th KKCNN Symposium on Civil Engineering Kyungju, Korea, December 8 - 10 , 200 3. Robust Hybrid Seismic Isolation System for a Seismically Excited Cable-Stayed Bridge. Kyu-Sik Park , Ph. D. Candidate, KAIST, Korea Hyung-Jo Jung , Assistant Professor, Sejong Univ., Korea

kiefer
Download Presentation

16 th KKCNN Symposium on Civil Engineering Kyungju, Korea, December 8 - 10 , 200 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 16th KKCNN Symposium on Civil Engineering Kyungju, Korea, December8-10, 2003 Robust Hybrid Seismic Isolation System for a Seismically Excited Cable-Stayed Bridge Kyu-Sik Park,Ph. D. Candidate, KAIST, Korea Hyung-Jo Jung, Assistant Professor, Sejong Univ., Korea Woo-Hyun Yoon, Professor, Kyungwon Univ., Korea In-Won Lee, Professor, KAIST, Korea

  2. Contents • Introduction • Robust hybrid seismic isolation system • Numerical examples • Conclusions Structural Dynamics & Vibration Control Lab., KAIST, Korea

  3. Introduction • Hybrid seismic isolation system (HSIS)  A combination of passive and active control devices • Passive devices: offer some degree of protection in the case of power failure • Active devices: improve the control performances  However, the robustness of HSIS could be decreased by the active control devices. Structural Dynamics & Vibration Control Lab., KAIST, Korea

  4. Objective of this study Apply robust control algorithms to improve the controller robustness of HSIS Structural Dynamics & Vibration Control Lab., KAIST, Korea

  5. Robust hybrid seismic isolation system (RHSIS) • Control devices  Passive control devices • Lead rubber bearings (LRBs) • Design procedure: Ali and Abdel-Ghaffar (1995) • Bouc-Wen model  Active control devices • Hydraulic actuators (HAs) • An actuator capacity has a capacity of 1000 kN. • The actuator dynamics are neglected. Structural Dynamics & Vibration Control Lab., KAIST, Korea

  6. Control algorithm  RHSIS I • Primary control scheme · Linear quadratic Gaussian (LQG) algorithm • Secondary control scheme · On-Off type controller according to LRB’s responses Structural Dynamics & Vibration Control Lab., KAIST, Korea

  7. Bridge Model LRB MUX Sensor LQG On-Off HA Block diagram of RHSIS I Structural Dynamics & Vibration Control Lab., KAIST, Korea

  8.  RHSIS II • H2 control algorithm with frequency weighting filters • Frequency weighting filters Structural Dynamics & Vibration Control Lab., KAIST, Korea

  9. Bridge Model R Wu Wz kg Wg Q LRB DM MUX H2 HA Sensor K Block diagram of RHSIS II Structural Dynamics & Vibration Control Lab., KAIST, Korea

  10.  RHSIS III • H control algorithm with frequency weighting filters Structural Dynamics & Vibration Control Lab., KAIST, Korea

  11. Numerical examples • Analysis model  Bridge model • Bill Emerson Memorial Bridge · Benchmark control problem (Dyke et al., 2003) · Under construction in Cape Girardeau, MO, USA ·16 Shock transmission devices (STDs) are employed between the tower-deck connections. Structural Dynamics & Vibration Control Lab., KAIST, Korea

  12. 142.7 m 350.6 m 142.7 m Schematic of the Bill Emerson Memorial Bridge Structural Dynamics & Vibration Control Lab., KAIST, Korea

  13. 142.7 m 350.6 m 142.7 m : Accelerometer : Displacement sensor Configuration of sensors Structural Dynamics & Vibration Control Lab., KAIST, Korea

  14. 142.7 m 350.6 m 142.7 m 4+3 2+3 4+3 2+3 2+3 4+3 2+3 4+3 Configuration of control devices (HAs+LRBs) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  15. PGA: 0.348g  Historical earthquake excitations Structural Dynamics & Vibration Control Lab., KAIST, Korea

  16. PGA: 0.348g PGA: 0.143g  Historical earthquake excitations Structural Dynamics & Vibration Control Lab., KAIST, Korea

  17. PGA: 0.348g PGA: 0.143g PGA: 0.265g  Historical earthquake excitations Structural Dynamics & Vibration Control Lab., KAIST, Korea

  18.  Evaluation criteria •J1/J7 : Peak/Normed base shear • J2/J8 : Peak/Normed shear at deck level • J3/J9 : Peak/Normed overturning moment • J4/J10 : Peak/Normed moment at deck level • J5/J11 : Peak/Normed cable tension deviation • J6: Peak Deck dis. at abutment Structural Dynamics & Vibration Control Lab., KAIST, Korea

  19. Analysis results  Control performances (a) Uncontrolled (b) RHSIS III Displacement under El Centro earthquake Structural Dynamics & Vibration Control Lab., KAIST, Korea

  20. (a) Uncontrolled (b) RHSIS III Cable tension under El Centro earthquake Structural Dynamics & Vibration Control Lab., KAIST, Korea

  21. (a) Uncontrolled (b) RHSIS III Shear force under El Centro earthquake Structural Dynamics & Vibration Control Lab., KAIST, Korea

  22. • Maximum evaluation criteria for all three earthquakes *Conventional HSIS (HSIS with LQG) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  23. • Maximum evaluation criteria for all three earthquakes *Conventional HSIS (HSIS with LQG) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  24.  Controller robustness • The dynamic characteristic of as-built bridge is not identical to the numerical model. • To verify the applicability of RHSIS, the controller robustness is investigated to perturbation of stiffness parameter. where : nominal stiffness matrix : perturbed stiffness matrix : perturbation amount (5% ~ 30 %) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  25. •Maximum variations of evaluation criteria for all three • earthquakes (%, 5% perturbation) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  26. •Maximum variations of evaluation criteria for all three • earthquakes (%, 20% perturbation) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  27. Max. variation of evaluation criteria for variations of stiffness perturbation Structural Dynamics & Vibration Control Lab., KAIST, Korea

  28. Conclusions • Hybrid seismic isolation system with robust control algorithms  Has excellent robustness for stiffness perturbation without loss of control performances • RHSIS I obtains robustness only for 5% stiffness perturbations. • RHSIS III has more larger acting region of controller than RHSIS II.  Robust hybrid seismic isolation system could effectively be used to seismically excited cable-stayed bridge. Structural Dynamics & Vibration Control Lab., KAIST, Korea

  29. Acknowledgements • This research is supported by the National Research Laboratory (NRL) program from the Ministry of Science of Technology (MOST) and the Grant for Pre-Doctoral Students from the Korea Research Foundation (KRF) in Korea. Thank you for your attention! Structural Dynamics & Vibration Control Lab., KAIST, Korea

More Related