Agenda 01 02 03 04 05 Introduction to Tuned Liquid Dampers Required Modification Case Study Conclusion Acknowledgments 01 Introduction What are Dynamic Absorbers What are Tuned Liquid Dampers ID: 775622
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Slide1
Tuned Liquid Dampers
Khaled Al Masaid
Slide2Agenda
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05
Introduction to Tuned Liquid Dampers
Required Modification
Case Study
Conclusion
Acknowledgments
Slide301
Introduction
What are Dynamic Absorbers ?
What are Tuned Liquid Dampers ?
Advantages over Tuned Mass Dampers?
Slide4Dynamic Vibration Absorbers
DVA are used to reduce the dynamic response of a structure
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Modern tall buildings are lightweight, flexible and have low inherent damping
Structure base motion occurs due to earthquakes or high wind-loads
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Dynamic Vibration Absorbers
Two main types of DVA include:
Tuned Mass Damper (TMD)
Tuned Liquid Damper (TLD)
Slide5Tuned Liquid Damper (TLD)TLD consists of a rigid tank partially filled with a fluid
The energy will be dissipated due to wave breaking
Structure response is reduced by absorbing energy of base excitation
The damper is tuned to the natural frequency of the structure
Design of TLD depends on the structure parameters
LTD
Working Principle of a Damper Tank
Slide6Advantages of TLD systemBelow ARE PRESENTED THE BENEFTIS OF ltd AND THE EXPERIMENTAL SET-UP
Benefits of
TLD
Low installation cost
Easy installation into existing structure
Little maintena-ncerequired
Threats
Simple tuning of frequency
Experimental Set-up
Slide7Mathematical ModelThe performance of TLDs can be defined in terms of Four parameters
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Mass Ratio
Structural Damping Ratio
Absorber Damping Ratio
Tuning Ratio
Slide802
Required Improvement
Multiple Tuned Liquid Dampers
Slide9Multiple Tuned Liquid DampersIn some cases MTLDs must be employed as they can offer a better performance
The TLD tanks within a MTLDs system have different frequencies
Provide greater reduction of structural motion
Increasing the number of dampers will improve its efficiency
Slide10Multiple Tuned Liquid Dampers (MTLDs)
Slide1103
Case Study
York Place Tower Hong Kong
Performance Based Design
Experimental Result
Slide12Case Study – York Place Tower Hong Kong
Slide13Case Study – Hong Kong
Low slenderness ratio will make structure more sensitive
Slender and light-weight structures have become more common
Suitable land for development is limited
Excitation mainly due to high speed wind motion
Located in a typhoon-active region
Hong
Kong
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Slide14Case Study – York Place Tower
39-story building (152 meters)Located in an urban area, base width 13 meters Slenderness ratio 1:12Performance-based design approach was used for the structure
Slide15Experimental Results
Slide1604
Conclusion
Slide17Conclusion
Dynamic vibration absorbers have been effective in controlling the response of structures.
The TLD reduces the response of a structure by absorbing the kinetic energy from the base excitation, then energy is dissipated by wave breaking.
A TLD system’s performance will be improved once changed to MTLDs system.
Slide1805
Acknowledgments
Thank you !
Questions ?