Optimal Use of Viscoelastic Dampers in Building Frames for Seismic Force

Shukla, Anuj; Datta, T. K.

doi:10.1061/(asce)0733-9445(1999)125:4(401)

Cited by 141 publications

(57 citation statements)

References 6 publications

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“…Tall buildings are sometimes fitted with various energy absorption devices including viscoelastic tuned dampers to mitigate the dynamic responses of the building structures due to wind-and earthquake-excitation (Min et al, 2004;Shukla & Datta, 1999). Temperature and frequency are two factors that affect the performance and hence the effectiveness of these viscoelastic dampers.…”

Section: Recommendation For Further Workmentioning

confidence: 99%

A methodology for developing high damping materials with application to noise reduction of railway track

Ahmad

2009

The Journal of the Acoustical Society of America

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For application in damping treatments, elastomeric materials should have a high damping loss factor, but this is inevitably linked to a strong temperature-dependence of the dynamic properties. A methodology is developed that allows a material to be formulated for a particular damping application where temperature-dependence has to be taken into account. The methodology is applied to the case of a tuned absorber system used for damping the vibration of a railway track. This is required to be effective over a temperature range -20 to 40 .To investigate the effect of the temperature on the performance of a rail damper, a simple Timoshenko beam model of the track vibration is used, to which are added single-frequency and dual-frequency tuned absorbers. The results show that a high noise reduction can be achieved for the optimum stiffness, provided that the loss factor is between about 0.25 and 0.4.In order to study the generic effects of high damping versus constant stiffness, the time-temperature superposition principle is used to convert frequency-dependence to temperature-dependence for a notional material with constant loss factor. This is used in the prediction of decay rates and thereby noise reduction. In addition, a weighted noise reduction is studied by using measured rail temperature distributions. This temperatureweighted noise reduction allows a single number measure of performance to be obtained which can be used to assess various elastomeric materials in order to determine the optimum material for a given situation.Two types of viscoelastic material, butyl and EPDM rubbers with various amount of fillers and plasticisers are investigated. The properties of both rubbers have been measured over the range of temperatures for frequencies 300-3000 Hz. For this a test rig had to be modified. For butyl, the best combination of filler and plasticiser gives temperature weighted noise reductions up to 5.9 dB(A). Butyl rubber is suitable for use in the rail absorber giving high noise reductions between 0 and 40 . The best EPDM compound gives a temperature-weighted noise reduction up to 6.2 dB(A). Comparing these two rubbers, EPDM is more suitable for low temperatures below 10 and butyl is more suitable for higher temperatures above 10 .

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Section: Recommendation For Further Workmentioning

confidence: 99%

A methodology for developing high damping materials with application to noise reduction of railway track

Ahmad

2009

The Journal of the Acoustical Society of America

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“…The damping vector, whose i-th element is the i-th oor drift in the ÿrst mode shape divided by its yield drift, is multiplied by a factor that is obtained using the Secant Method so as to satisfy GDI = GDI max (8) where the GDI in Equation (8) is computed from a time history analysis of the frame (Equation (1)) excited by the 'active' ground motion. Gradient derivation.…”

Section: Stage 2: Computation Of a Starting Point C Domentioning

confidence: 99%

Optimal design of supplemental viscous dampers for irregular shear-frames in the presence of yielding

Lavan

Levy

2005

Earthquake Engng Struct. Dyn.

101

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SUMMARYA methodology for the optimal design of supplemental viscous dampers for regular as well as irregular yielding shear-frames is presented. It addresses the problem of minimizing the added damping subject to a constraint on an energy-based global damage index (GDI) for an ensemble of realistic ground motion records. The applicability of the methodology for irregular structures is achieved by choosing an appropriate GDI. For a particular choice of the parameters comprising the GDI, a design for the elastic behavior of the frame or equal damage for all stories is achieved. The use of a gradient-based optimization algorithm for the solution of the optimization problem is enabled by ÿrst deriving an expression for the gradient of the constraint. The optimization process is started for one 'active' ground motion record which is e ciently selected from the given ensemble. If the resulting optimal design fails to satisfy the constraints for other records from the original ensemble, additional ground motions (loading conditions) are added one by one to the 'active' set until the optimum is reached. Two examples for the optimal designs of supplemental dampers are given: a 2-story shear frame with varying strength distribution and a 10-story shear frame. The 2-story shear frame is designed for one given ground motion whereas the 10-story frame is designed for an ensemble of twenty ground motions.

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“…There is a countless number of engineering applications, ranging from the macro-to the nano-scales, where a periodic inversion of the motion direction is present. Earthquake viscoelastic dampers are a classic example [15,15]: the design of these devices mostly relies on practical and empirical guidelines, and no tool for quantitative predictions is available. This lack of a robust theoretical framework affect different components, like all the sealing systems in mechanical applications with an alternate motion [14].…”

Section: Introductionmentioning

confidence: 99%

A Parametrically Time-Dependent Methodology for Reciprocating Contact Mechanics Between Viscoelastic Solids

Putignano¹,

Carbone²,

Dini³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. We implement an original Boundary Element methodology to study the reciprocating contact mechanics between linear viscoelastic materials. Results are shown for the case of a rigid sphere sinusoidally driven in sliding contact with a viscoelastic half-space. We observe the presence of multi-peaked pressure and displacement distributions; the hysteric friction curve is finally shown for different values of the frequency.1856

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Optimal Use of Viscoelastic Dampers in Building Frames for Seismic Force

Cited by 141 publications

References 6 publications

A methodology for developing high damping materials with application to noise reduction of railway track

A methodology for developing high damping materials with application to noise reduction of railway track

Optimal design of supplemental viscous dampers for irregular shear-frames in the presence of yielding

A Parametrically Time-Dependent Methodology for Reciprocating Contact Mechanics Between Viscoelastic Solids

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