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Modeling and experimental validation of a new type of tuned liquid damper

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Abstract

This paper introduces a new type of tuned liquid damper (TLD) having a relatively simple, easy-to-model behavior and high effectiveness in controlling structural vibrations. It consists of a traditional TLD with addition of a floating roof. Since the roof is much stiffer than water, it prevents wave breaking, hence making the response linear even at large amplitudes. The roof also facilitates the incorporation of supplemental devices with which the level of damping of the liquid vibration can be substantially augmented. This newly proposed TLD, denoted as tuned liquid damper with floating roof (TLD-FR), maintains the traditional advantages of TLDs (low cost, easy installation and tuning), but its numerical characterization is much simpler because the floating roof suppresses higher sloshing vibration modes, resulting in a system that can be represented by a single-degree-of-freedom model. An efficient numerical scheme, where the dynamic behavior of the TLD-FR is expressed as a second-order lineal system of equations, is discussed and validated by scaled experimental tests. The equations of motion of a structure equipped with a TLD-FR are then derived and manipulated to offer a unifying representation dependent upon only four model characteristics of the TLD-FR: The first three (mass, frequency and damping ratios) are common for all type of mass dampers, whereas the final one, termed efficiency index, is related to a similar parameter used to characterize liquid column dampers. Through this approach, the behavior of the proposed TLD-FR can be easily correlated with the behavior of other well-known linear mass damper devices. The relationship between these parameters and the geometrical characteristics of the TLD-FR is also examined. Finally, the identification of the optimal characteristic of the TLD-FR (natural frequency and damping) under stationary stochastic excitation is discussed.

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Authors and Affiliations

  1. Department of Structural and Geotechnical Engineering, Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna 4860, Santiago, Chile

    Rafael O. Ruiz & Diego Lopez-Garcia

  2. Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN, 46556, USA

    Rafael O. Ruiz & Alexandros A. Taflanidis

  3. National Research Center for Integrated Natural Disaster Management CONICYT/FONDAP/15110017, Santiago, Chile

    Diego Lopez-Garcia

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  1. Rafael O. Ruiz
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  2. Diego Lopez-Garcia
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  3. Alexandros A. Taflanidis
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Correspondence to Rafael O. Ruiz.

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Ruiz, R.O., Lopez-Garcia, D. & Taflanidis, A.A. Modeling and experimental validation of a new type of tuned liquid damper. Acta Mech 227, 3275–3294 (2016). https://doi.org/10.1007/s00707-015-1536-7

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  • DOI: https://doi.org/10.1007/s00707-015-1536-7

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