Abstract
The performance of tuned liquid column dampers (TLCDs) for the passive control of flexible structures under random seismic loading is investigated using random vibration analysis. A non-stationary stochastic process with frequency and amplitude modulation is used to represent the earthquake strong motion, and an equivalent linearization technique is used to account for the non-linear damping force in the TLCD. The TLCD performance is evaluated on the basis of the structural response statistics, namely, the expected maximum and root-mean-square displacements, and root-mean-square absolute accelerations and interstory shears. Illustrative examples are presented using SDOF and MDOF shear-beam structural models, and two stochastic input ground motions representing short-duration and long-duration ground motions with low frequency content. A parametric study is conducted to investigate the effects of the mass ratio, coefficient of head loss for the damper, and loading intensity on the TLCD performance.
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