Scissor-Jack-Damper System for Reduction of Stay Cable

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Presentation transcript:

Scissor-Jack-Damper System for Reduction of Stay Cable 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

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

Structural Dynamics & Vibration Control Lab., KAIST, Korea 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

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

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

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

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

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

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

Structural Dynamics & Vibration Control Lab., KAIST, Korea 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

Structural Dynamics & Vibration Control Lab., KAIST, Korea 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

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

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

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

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

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

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

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

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