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Chul-Min Park *: Graduate Student , KAIST, Korea

The 18 th KKCNN, Kaohsiung, Taiwan 18-21, December, 2005. Scissor-Jack-Damper System for Reduction of Stay Cable. Chul-Min Park *: Graduate Student , KAIST, Korea Hyung-Jo Jung: Professor, Sejong University, Korea Ji-Eun Jang: Graduate Student , KAIST, Korea

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Chul-Min Park *: Graduate Student , KAIST, Korea

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  1. The 18th KKCNN, Kaohsiung, Taiwan 18-21, December, 2005 Scissor-Jack-Damper System for Reduction of Stay Cable Chul-Min Park*: Graduate Student, KAIST, Korea Hyung-Jo Jung: Professor, Sejong University, Korea Ji-Eun Jang: Graduate Student, KAIST, Korea Kyu-Sik Park: Post Doctoral Fellow, UIUC, USA In-Won Lee: Professor, KAIST, Korea

  2. Contents • Introduction • Toggle-Brace-Damper System • Analytical Study on Performance of Scissor-Jack-Damper • Conclusions Structural Dynamics & Vibration Control Lab., KAIST, Korea

  3. Introduction • Backgrounds • The novel configuration of Scissor-Jack-Damper results in • device displacements that are larger than the cable drift. • The potential for cost savings and improved performance Structural Dynamics & Vibration Control Lab., KAIST, Korea

  4. Toggle-Brace-Damper System • Diagonal and chevron brace configuration Chevron brace Diagonal brace Structural Dynamics & Vibration Control Lab., KAIST, Korea

  5. The theory of brace-damper system (1) (2) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  6. Magnification factor in brace system (3) (4) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  7. Toggle-brace-damper configurations Lower toggle Upper toggle Structural Dynamics & Vibration Control Lab., KAIST, Korea

  8. Scissor-Jack • Scissor-jack-damper configuration (Sigaher, A. N. 2003) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  9. Magnification factor Structural Dynamics & Vibration Control Lab., KAIST, Korea

  10. Analytical Study on Performance of Scissor-Jack-Damper • Cable Dynamics • excitation : (5) where, : zero-mean Gaussian white noise process Structural Dynamics & Vibration Control Lab., KAIST, Korea

  11. Equation of motion (6) where, : transverse deflection of the cable : viscous damping per unit length : distributed load on the cable : transverse damper force at location Structural Dynamics & Vibration Control Lab., KAIST, Korea

  12. Control oriented model (Johnson et al. 2000) (7) • Governing equation of motion (8) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  13. (9) (10) (11) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  14. Cable characteristics (Christeson 2001) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  15. Scissor-jack-damper system for stay cable • magnification factor (12) • damping force exerted on the cable (13) Structural Dynamics & Vibration Control Lab., KAIST, Korea

  16. Analytical results • Linear viscous damper • RMS displacement • RMS velocity • optimal Structural Dynamics & Vibration Control Lab., KAIST, Korea

  17. Scissor-Jack-Damper system • RMS displacement • RMS velocity • optimal Structural Dynamics & Vibration Control Lab., KAIST, Korea

  18. Conclusions • Scissor-Jack-Damper configuration • - more efficient to stay cable • - increases the damping force exerted on the cable • - reduces the required damper capacity • Limitation of passive damping system • - performance degradation • dependent on damper location Structural Dynamics & Vibration Control Lab., KAIST, Korea

  19. Thank you for your attention! Structural Dynamics & Vibration Control Lab., KAIST, Korea

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