Modal response characteristics of a multiple-degree-of-freedom structure incorporated with tuned viscous mass dampers

Kohju Ikago, Yoshifumi Sugimura, Kenji Saito, Norio Inoue

    Research output: Contribution to journalArticlepeer-review

    59 Citations (Scopus)

    Abstract

    A new seismic control device using a ball screw mechanism as an apparent mass amplifier has been developed, which is referred to as the tuned viscous mass damper (TVMD). This device enables effective seismic control using a tuned mass. For a multiple-degree-of-freedom (MDOF) seismic control system incorporated with the TVMD, a design method based on numerical optimization has been previously presented by the authors. However, simpler design methods that are suitable for a practical design have not yet been presented. At the preliminary design stage, it is essential for structural designers to understand the seismic response characteristics of the structure in terms of modal responses. However, a complex-valued eigenvalue analysis, which most structural designers are unfamiliar with, is required for accurate seismic response estimation. This is because the seismic control system incorporated with TVMDs is nonproportionally damped. In this paper, the authors propose a seismic response estimation method that does not require a complex valued analysis. An analysis example illustrates that the square root of the sum of the square (SRSS) of the maximum modal responses derived from the undamped real eigenvalue analysis gives a good approximation in practical terms.

    Original languageEnglish
    Pages (from-to)375-382
    Number of pages8
    JournalJournal of Asian Architecture and Building Engineering
    Volume11
    Issue number2
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Complex-valued eigenvalue analysis
    • Fixed point method
    • Optimum design
    • Seismic control
    • Tuned mass damper

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Architecture
    • Cultural Studies
    • Building and Construction
    • Arts and Humanities (miscellaneous)

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