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Graduate Student Chul-Min Park*: Graduate Student, KAIST, Korea Hyung-Jo Jung: Professor, Sejong University, Korea Graduate Student Ji-Eun Jang: Graduate.

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Presentation on theme: "Graduate Student Chul-Min Park*: Graduate Student, KAIST, Korea Hyung-Jo Jung: Professor, Sejong University, Korea Graduate Student Ji-Eun Jang: Graduate."— Presentation transcript:

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

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

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

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

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

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

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

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

9 9 Structural Dynamics & Vibration Control Lab., KAIST, Korea Magnification factor Magnification factor Type diagonal brace chevron brace upper toggle system lower toggle system scissor-Jack-damper

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

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

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

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

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

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

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

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

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

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


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