Single and Multiple Tuned Liquid Column Dampers for Seismic Applications.
Single and Multiple Tuned Liquid Column Dampers for
Sadek, F.; Mohraz, B.; Lew, H. S.
NISTIR 5920; 45 p. November 1996.
Earthquake Engineering and Structural Dynamics, Vol.
27, No. 5, 439-463, 1998.
Available from: National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
1-800-553-6847 or 703-605-6000;
Order number: PB97-132062
dampers; seismic loads; earthquakes; statistical
The optimum parameters of single and multiple tuned
liquid column dampers (TLCD) for reducing the response
of structures to seismic loads are presented. A
deterministic analysis is carried out using 72
earthquake ground motion records to determine the
optimum tuning ratio, tube width to liquid length ratio,
and head loss coefficient corresponding to a given mass
ratio for single tuned liquid column dampers (STLCD). A
similar analysis is performed to determine the optimum
central tuning ratio, tuning bandwidth, and grouping of
dampers for multiple tuned liquid column dampers
(MTLCD). The optimum parameters are used to compute the
response of several single-degree-of-freedom structures
and one multi-degree-of-freedom structure with single
and multiple TLCDs to different earthquake excitations.
The study indicated that: (a) the use of the optimum
parameters reduces the displacement and acceleration
responses; (b) MTLCDs have a slight advantage over
STLCDs in reducing the response; and (c) MTLCDs are
robust to errors in estimating the structural
parameters. The solution from an analysis using TLCDs
is compared with that using tuned mass dampers where it
is found that both devices result in comparable
reductions in the response. Design examples using
STLCDs and MTLCDs in a simple bridge model and in a
ten-story structure are presented to illustrate how the
parameters are selected and demonstrate the performance
of the devices under different ground excitations.