A Seismic Control System With Multi-Tuning Viscous Mass Damper and Its Design Method

Kida, Hidenori; Nakaminami, Shigeki; Saito, Kenji; Ikago, Kohju; Inoue, Norio

doi:10.3130/aijs.74.1575

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Shaking table tests with small‐scale TVMDs and nonlinear time history analyses were conducted by Arai et al to confirm the effectiveness of the vibration control system. Kida et al conducted a full‐scale dynamic test of a TVMD to further confirm the validity of the theory and the analysis method employed. Design methods for single‐degree‐of‐freedom (SDOF) and multiple‐degree‐of‐freedom TVMD seismic control systems were proposed by Ikago et al, and comparison studies and shake table tests of a small‐scale TVMD were also conducted to verify its effectiveness.…”

Section: Introductionmentioning

confidence: 97%

Demand-based optimal design of oscillator with parallel-layout viscous inerter damper

Pan

Zhang

Luo

et al. 2017

Struct Control Health Monit

119

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SummaryIn this study, a demand-based optimal design method is proposed for an oscillator (a single-degree-of-freedom system) with a parallel-layout viscous inerter damper (PVID). The proposed design method overcomes some deficiencies of the existing method, which is based on the fixed-point theory and is mainly suitable for tuned mass dampers. Moreover, for the fixed-point method, the inherent damping of the primary structure is neglected, and the global optimal solution cannot be obtained.The proposed method can obtain a more rational and practical design for the actual design by minimizing both the response and the cost. The design problem of a PVID-equipped oscillator is transformed into a multi-objective optimization problem that can be solved using the ε-constraint approach, which is consistent with the concept of demand-based design. The dynamic response of the oscillator and the force of the PVID (i.e., the cost factor) are evaluated according to theories of random vibration to reduce the number of calculations required. A computer program is developed to perform demand-based parametric design of a PVID-equipped oscillator. Several design cases were examined under different excitation conditions using the computer program, and dynamic time history analyses were then conducted to verify the designs obtained. The results show that the proposed optimal design method identifies satisfactory designs more effectively than the existing method by obtaining PVID design parameter values that better meet the performance demand and simultaneously minimize the cost. | INTRODUCTIONStructural vibrations induced by earthquake or wind loads can be attenuated by various means, including modifying the stiffness, masses, damping, or shape of the structure, and by providing passive or active counter forces.[1] Among numerous available methods, passive mitigation measures are the most widely used in building and bridge engineering. Passive vibration mitigation involves providing a structure with additional damping by installing dampers, and the effectiveness of damping has been confirmed by extensive scientific studies and practical applications. Many types of dampers are used in the passive vibration mitigation of building structures all over the world, such as metalyield dampers, friction dampers, viscoelastic dampers, viscous fluid dampers, tuned mass dampers, and tuned liquid dampers. The concept of tuned mass dampers dates back to the 1900s, when Frahm [2] introduced a tuned mass damper (TMD) to absorb the energy of vibrations, thereby reducing the amplitudes of motions. Den Hartog [3] modified the original TMD concept in the

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Section: Introductionmentioning

confidence: 97%

Demand-based optimal design of oscillator with parallel-layout viscous inerter damper

Pan

Zhang

Luo

et al. 2017

Struct Control Health Monit

119

View full text Add to dashboard Cite

show abstract

“…They subsequently performed time‐history analyses to investigate the applicability of the system to nonlinear structural systems subjected to seismic excitations. Kida et al conducted a full‐scale dynamic test on a TVMD‐controlled structure to verify the theoretical analysis method. Ikago et al proposed a simple design method for a seismic control system with TVMD based on Den Hartog's optimal tuning rules for TMD systems .…”

Section: Introductionmentioning

confidence: 99%

“…They found that the system could cause substantial mass magnification and a significant increase in modal damping. Kida et al introduced an improved TVMD with a force restriction mechanism (FRTVMD) to avoid excessive stresses and performed full‐scale dynamic tests on the seismic control system. They found that the excessive response force of TVMD generated through resonance could be limited by adjusting the axial force applied to the coned disk springs holding the frictional material.…”

Section: Introductionmentioning

confidence: 99%

Design of structure with inerter system based on stochastic response mitigation ratio

Pan

Zhang

2018

Struct Control Health Monit

113

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Summary An easy‐to‐use method for a practical design of single‐degree‐of‐freedom (SDOF) structures with inerter systems was developed. The method adopts the stochastic vibration response mitigation ratio as the design index, and expressions of the closed‐form stochastic response are used to evaluate the structural response and optimize the design parameters. Three basic types of inerter systems with tuning and damping magnification mechanisms were considered in this study. The closed‐form stochastic responses of SDOF structures with inerter systems under white‐noise excitations were derived on the basis of the equations of motion. In addition, the response variation patterns due to changes in key parameters of the inerter system were investigated, and the parameter optimization approaches for different inerter systems are proposed on the basis of the response variation patterns. The use of the closed‐form stochastic response mitigation ratio as the design index leads to a rational and simple design process, with the tuning or response extremum conditions employed as complementary conditions for determining the key design parameters. Thus, the proposed method involves the solution of a set of nonlinear equations. Fitted empirical design formulae are provided in this paper for quick calculation of the key parameters of the SDOF structure with the inerter system for a given response mitigation ratio and inherent damping ratio. Moreover, design examples are provided to verify the proposed method. The design results show that the proposed method is effective and more convenient than existing methods. Furthermore, the method can be easily extended for considering seismic excitations and design of structures with other complex‐form inerter systems.

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“…Fundamental mechanisms of earthquake response reduction in building structures with inertial dampers are investigated in this paper. Although there are some reports on the inertial dampers 4–12, there exist a few on the fundamental mechanisms of earthquake response reduction in building structures with inertial dampers. A pseudo‐negative stiffness effect (for example, 7) may be one of the features, which such structures with inertial dampers possess.…”

Section: Introductionmentioning

confidence: 99%

Fundamental mechanism of earthquake response reduction in building structures with inertial dampers

Takewaki¹,

Murakami²,

Yoshitomi³

et al. 2011

Struct. Control Health Monit.

126

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Fundamental mechanisms of earthquake response reduction in building structures with inertial mass dampers are investigated. The inertial mass damper is effective with respect to relative acceleration between two nodes. The influence of inertial mass dampers on the ground-motion input can be expressed by the influence coefficient vector to be multiplied on the ground-motion acceleration in the right-hand side of the equations of motion. It is shown that, when an inertial mass damper is taken out from one story, the component of the influence coefficient vector above that story becomes 1. This means that, if an inertial mass damper is taken out from one story, the inertial mass dampers above that story do not influence the input acceleration above that story. This observation is supported by the closed-form expression of the influence coefficient vector. The mechanism of earthquake response reduction is also discussed from the viewpoint of earthquake input energy. It is shown that the earthquake input energy under an acceleration input with a constant Fourier spectrum depends on the influence coefficient vector. Finally, the characteristics of earthquake response reduction via inertial mass dampers are presented for three recorded ground motions.

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A Seismic Control System With Multi-Tuning Viscous Mass Damper and Its Design Method

Cited by 6 publications

References 4 publications

Demand-based optimal design of oscillator with parallel-layout viscous inerter damper

Demand-based optimal design of oscillator with parallel-layout viscous inerter damper

Design of structure with inerter system based on stochastic response mitigation ratio

Fundamental mechanism of earthquake response reduction in building structures with inertial dampers

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