Optimal design of tuned liquid column dampers for seismic response control of base-isolated structures

Matteo, Alberto Di; Furtmüller, Thomas; Adam, Christoph; Pirrotta, Antonina

doi:10.1007/s00707-017-1980-7

Cited by 58 publications

(53 citation statements)

References 29 publications

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“…Furthermore, the optimal ATLD also exhibits better performance for the displacement than that for the acceleration measured at the top of the bushing. This phenomenon can also be observed in the TLCD‐controlled base‐isolated structure . Moreover, the effectiveness of tuned liquid damper (TMD) and TLCD for seismic reduction is relevant to the spectral characteristics of the input motions.…”

Section: Numerical Results and Discussionmentioning

confidence: 90%

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Yue

Chen

2018

Struct Control Health Monit

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Summary It is of great significance to conduct seismic qualification and mitigation for composite bushing, whose damage may cause massive power outage and huge cost of repair. In this paper, the annular tuned liquid damper (ATLD), utilizing the sloshing characteristics of transformer oil in the dome, is proposed to reduce the seismic responses of the composite bushing. As to the annular feature of the metallic dome, the simplified formulas for calculating the liquid sloshing frequencies in the dome are derived based on the linear wave theory, which provides a direct and fast way for the predesign of ATLD. Comparing with the experimental results reported in literature, the accuracy and applicability of the proposed formulas are verified. In addition, parametric studies of the first 3 sloshing frequencies including liquid height and the outer and the inner radii are carried out. The optimal tuning analysis of vibration reduction in frequency domain is performed on the structure base excitation. The vibration reduction analyses in time domain of the ATLD for the composite bushing subjected to real earthquake records are carried out and discussed simultaneously. It is shown that the simplified formulas presented in this paper provide a convenience for the predesign of ATLD and the optimal ATLD is effective in reducing the vibration of the composite bushing.

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Section: Numerical Results and Discussionmentioning

confidence: 90%

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Yue

Chen

2018

Struct Control Health Monit

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“…, and the optimal tuning follows directly from Equation (16) or Equation (18). This system was studied in [25,26,30], but we can reproduce those results with much less effort.…”

Section: Tuned Liquid Column Dampermentioning

confidence: 76%

“…Other implementations of the TMD principle such as the pendulum tuned mass damper are discussed for high-rise building applications in [12,13] and for offshore wind turbines in [14]. The Tuned Liquid Column Damper (TLCD) was influenced by [15] and studied recently in relation to the seismic response of base-isolated structures, [16]. The Tuned Liquid Damper (TLD) is discussed, e.g., in [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effective Mass of Tuned Mass Dampers

2018

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Tuned Mass Dampers (TMDs) are widely used for the control and mitigation of vibrations in engineering structures, including buildings, towers, bridges and wind turbines. The traditional representation of a TMD is a point mass connected to the structure by a spring and a dashpot. However, many TMDs differ from this model by having multiple mass components with motions of different magnitudes and directions. We say that such TMDs have added mass. Added mass is rarely introduced intentionally, but often arises as a by-product of the TMD suspension system or the damping mechanism. Examples include tuned pendulum dampers, tuned liquid dampers and other composite mechanical systems. In this paper, we show how a TMD with added mass can be analyzed using traditional methods for simple TMDs by introducing equivalent simple TMD parameters, including the effective TMD mass, the mass of the equivalent simple TMD. The presence of added mass always reduces the effective TMD mass. This effect is explained as a consequence of smaller internal motions of the TMD due to the increased inertia associated with the added mass. The effective TMD mass must be correctly calculated in order to predict the TMD efficiency and in order to properly tune the TMD. The developed framework is easy to apply to any given general linear TMD system with a known motion. Here, we demonstrate the approach for a number of well-known examples, including tuned liquid dampers, which are shown to use only a small fraction of the total liquid mass effectively.

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“…Collectively, this led to the formulation of a classic design procedure of the TMD. These classic theories also led to the development of the tuned liquid mass, semiactive mass damper, and active mass damper …”

Section: Introductionmentioning

confidence: 99%

Tuned mass damper on a damped structure

Fang

Liu

Zhang

et al. 2019

Struct Control Health Monit

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Summary The classic design of the tuned mass damper on an undamped structure is based on the “fixed‐point” theory introduced by Den Hartog. Because of the lack of fixed points in the dynamic amplification of damped structures, a generalization of previous methods is presented in this study to identify the optimal parameters of the damper. The optimal frequency is identified by analyzing complex natural frequencies. The resulting frequency leads to a confluence point in the complex frequency locus and an equal modal damping ratio for the two vibration modes, provided that the damping ratio of the damper is less than a critical value. This critical value can be used as an upper bound of the damping ratio value in practice that can effectively restrict the relative motion of the damper. The optimal damping ratio is identified by ensuring that the dynamic amplification reaches an extremum value at a reference frequency. It is demonstrated that the resulting damping ratio accounts for the reduction in the motion of the primary structure and relative motion of the damper. Furthermore, a modified design procedure is proposed to determine the optimal parameters of the damper for damped structures with multiple degrees of freedom. Several numerical experiments indicate the efficiency of the proposed parameters and design procedure.

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Optimal design of tuned liquid column dampers for seismic response control of base-isolated structures

Cited by 58 publications

References 29 publications

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Effective Mass of Tuned Mass Dampers

Tuned mass damper on a damped structure

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