Tuned Liquid Dampers

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Tuned Liquid Dampers

  1. 1. TUNED LIQUIDDAMPERS
  2. 2. LATERAL LOAD RESISTANCE structural modifications aerodynamic modifications base isolation techniques damping sources
  3. 3. STRUCTURALMODIFICATIONSOutrigger system Belt bandage system
  4. 4. AERODYNAMICMODIFICATIONSFins Chamfered corners
  5. 5. BASE ISOLATIONElastomeric bearings Sliding bearings
  6. 6. DAMPING SOURCES structural aerodynamic soil auxiliary
  7. 7. WHY AUXILIARY SOURCES? very less contribution of other sources difficulty in estimation adverse effects predictable & reliable
  8. 8. AUXILIARY SOURCES active passivetuned liquid dampers semi active
  9. 9. TUNED LIQUID DAMPERS rectangular orcylindricalcontainer liquid stored isusually water sloshing waterdissipatesenergy wind inducedvibrations
  10. 10. TUNING tuned to the natural frequency of thestructure achieved by adjusting the dimensions frequency equation
  11. 11. EFFICIENCY amplitude dependent placing on top floor floater beads torsion springs screens and baffles
  12. 12. ADVANTAGES low installation cost no moving parts low operation and maintenance cost frequency can be controlled by adjustingheight resistance against wind & earthquake temporary use
  13. 13. TYPES OF TLDsTLDTSDshallow deepTLCDLCVA DTLCD HTLCD PTLCDCTLD
  14. 14. TUNED SLOSHING DAMPERS single or a group of liquid storedcontainers shallow and deep based on the ratio of depth of water tothat of the length in direction of vibration diameter in case of circular tanks < 0.15 shallow > 0.15 deep
  15. 15. TSDs (contd:) shallow TSDs has larger amplitude ofsloshing better damping at smaller vibrations non linear behavior at large scalevibrations deep TSDs linear behavior even underlarger excitations water can be used for fire fighting andemergency supply
  16. 16. APPLICATIONTSD unit Shin Yokohama Prince Hotel
  17. 17. TUNED LIQUID COLUMNDAMPERS liquid stored in interconnected tubes an orifice provided in between motion of liquid mass in the tube pressure drop due to orifice unidirectional nature double TLCD
  18. 18. TLCDs (contd) shape advantage known behavior extra control bydictating orificedimensions active control LCVA, HTLCD
  19. 19. APPLICATIONCross section One Wall Center
  20. 20. CONTROLLABLE TLDs
  21. 21. CONCLUSIONS Effective against both wind andearthquake TSDs suited for small scale excitations TLCDs are much more advantageous Control can be exercised for furtherefficiency, but costly.

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