Seismic Response Control Systems for Structures

  • Nishant Kishore Rai Department Atomic Energy, Mumbai-400 094
  • G.R. Reddy Bhaba Atomic Research Centre, Mumbai-400 078
  • S. Ramanujam Department Atomic Energy, Mumbai-400 094
  • V. Venkatraj Department Atomic Energy, Mumbai-400 094
  • P. Agrawal Department Atomic Energy, Mumbai-400 094
Keywords: Passive dampers, tuned sloshing water dampers (TSWD), tuned liquid dampers


Structures constructed in developing world are typically RC frames with masonry infill. These structures have little resistance for lateral loads caused by earthquake and wind. Even for  adequately designed structures also, due to permissible deformation beyond elastic limits, failure of masonry causes severe loss of life and property. In the case of structures designed to sustain excessive deformation such as of defence establishments, functioning and serviceability of machines and equipment installed therein are adversely affected. This co-lateral damage may be reduced by adopting another design philosophy of structure response control. In this methodology, a supplementary damping device is incorporated in the primary structure, which absorbs most of the seismic energy imparted to it, restricting the structural response within serviceable limits. These devices may be passive, active, semi-active or hybrid types. Other than passive all options are technology-intensive and dependent on external energy source, not a favourable proposition for developing nations. Among all the passive devices, tuned liquid dampers (TLDs) promise to be most suitable. Here, existing overhead water tanks (OHWT) may be used as TLD with slight adjustment and modification. This method will be able to control the structural response without putting any extra load on the existing or newly-designed buildings. This paper reviews various types of dampers and discusses evolution of tuned liquid dampers. A method has also been proposed for incorporating TLDs in existing and new structures. This methodology may be very useful for structures of defence establishment which are scattered and remotely placed by location, housing important equipments sensitive to vibrations, as it is free from external power dependence and regular maintenance.
Defence Science Journal, 2009, 59(3), pp.239-251, DOI:
How to Cite
Rai, N. K., Reddy, G., Ramanujam, S., Venkatraj, V., & Agrawal, P. (2009). Seismic Response Control Systems for Structures. Defence Science Journal, 59(3), 239-251.
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