Current
trends in the construction industry demands taller and lighter structures,
which are also more flexible and having quite a low damping value. This
increases failure possibilities and also, problems from the serviceability
point of view. Several techniques are available today to minimize the vibration
of the structure, out of which concept of using of TLD is a newer one. The
tuned liquid damper (TLD) is a liquid filled tank which uses liquid sloshing
action to dampen the oscillations of a structure. They are cost effective and
low maintenance dynamic vibration absorbers that are being used in flexible and
lightly damped structures. A numerical algorithm was developed to investigate
the response of the frame model, fitted with a TLD. A nonlinear TLD model was
considered. A total of five loading conditions was applied at the base of the
structure. First one was a sinusoidal loading corresponding to the resonance
condition with the fundamental frequency of the structure, second one was
corresponding to compatible time history as per spectra of IS-1893 (Part -1):
2002 for 5% damping at rocky soil and rest three were corresponding to
time histories of past earthquake such
as El Centro Earthquake record , Sanfranscisco Earthquake and Colianga
Earthquake. A series of experimental tests are conducted on a SDOF structuretuned
liquid damper systems to evaluate their performance under harmonic
excitation.The effect of the different parameters such as frequency ratio,
depth ratio and mass ratio on the behavior has been studied. The effectiveness
of the TLD was calculated in terms of percentage of reduction of amplitude of
displacements of the structure.
Keywords: Framed structure, Sloshing, Tuned liquid damper, Harmonic
excitation, Earthquake, Energy dissipation, Response control.
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