1. TUNED LIQUIDDAMPERS

2. LATERAL LOAD RESISTANCE structural modifications aerodynamic modifications base isolation techniques damping sources 3. STRUCTURALMODIFICATIONSOutrigger system Belt bandage system 4. AERODYNAMICMODIFICATIONSFins Chamfered corners 5. BASE ISOLATIONElastomeric bearings Sliding bearings 6. DAMPING SOURCES structural aerodynamic soil auxiliary 7. WHY AUXILIARY SOURCES? very less contribution of other sources difficulty in estimation adverse effects predictable & reliable 8. AUXILIARY SOURCES active passivetuned liquid dampers semi active 9. TUNED LIQUID DAMPERS rectangular orcylindricalcontainer liquid stored isusually water sloshing waterdissipatesenergy wind inducedvibrations 10. TUNING tuned to the natural frequency of thestructure achieved by adjusting the dimensions frequency equation 11. EFFICIENCY amplitude dependent placing on top floor floater beads torsion springs screens and baffles 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. TYPES OF TLDsTLDTSDshallow deepTLCDLCVA DTLCD HTLCD PTLCDCTLD 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. 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. APPLICATIONTSD unit Shin Yokohama Prince Hotel 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. TLCDs (contd) shape advantage known behavior extra control bydictating orificedimensions active control LCVA, HTLCD 19. APPLICATIONCross section One Wall Center 20. CONTROLLABLE TLDs 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.