Study on Similarity of Hysteretic Loops and Characteristic Parameters of Viscoelastic Dampers with Test Verifications

Zhou, Ying; Gong, Shunming; Lu, Xi

doi:10.4028/www.scientific.net/amm.353-356.1970

Cited by 5 publications

(3 citation statements)

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“…Larger displacement and force capacity dampers are needed to control dynamic response of buildings especially under seismic loadings. Moreover, it was shown that the VE dampers with various sizes exhibit significantly different mechanical properties even though they employ the same elastomeric material . Therefore, while studying vibration control of civil structures with VE damper, the size effects should be taken into account on the basis of related experimental tests.…”

Section: Introductionmentioning

confidence: 99%

“…A large number of studies have been conducted experimentally characterize mechanical response of VE dampers under different loading conditions. However, most of these studies have been on small capacity dampers, which had a rubber thickness of 5, 10, or between 12 and 15 mm and a shear area of less than 15,000 mm 2 . Larger displacement and force capacity dampers are needed to control dynamic response of buildings especially under seismic loadings.…”

Section: Introductionmentioning

confidence: 99%

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Experimental characterization and analytical modeling of a large-capacity high-damping rubber damper

Zhou

Shi

Ozbulut³

et al. 2018

Struct Control Health Monit

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Summary This study explores the mechanical response of a high‐damping rubber damper (HRD) under different loading conditions. HRD is a typical viscoelastic damper that consists of 2 layers of elastomer compound sandwiched between 3 steel plates. The elastomer compound used in this study is a synthetic isoprene rubber reinforced with carbon black and designed to provide high damping capacity with relatively low stiffness. Four damper specimens with a displacement capacity of 75 mm at 300% shear strain were fabricated. Each damper was subjected to harmonic loading to investigate the effects of strain amplitude, loading frequency, strain history, and cyclic loading on the mechanical properties of HRD. Hysteretic force–displacement loops for each loading condition were plotted, and the variations of maximum damper force, equivalent stiffness, storage shear modulus, dissipated energy, loss factor, and equivalent viscous damping ratio with different test parameters were examined. In addition, an analytical model capable of simulating behavior of HRD at various strain amplitudes and loading frequencies was proposed. The experimental results indicate that the developed HRD can provide a damping ratio ranging from 15% to 43% under different loading conditions and has relatively stable hysteresis loops under cyclic loads. In addition, the energy dissipation capacity of the damper significantly increases when the loading frequency is over 0.5 Hz without an increase in stiffness.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental characterization and analytical modeling of a large-capacity high-damping rubber damper

Zhou

Shi

Ozbulut³

et al. 2018

Struct Control Health Monit

View full text Add to dashboard Cite

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“…Se cuantifica también la notable mejora en el comportamiento sísmico debida a la introducción de los disipadores histeréticos. (Nielsen, Mualla, & Iwai, 2004), c) viscoelastic solid (Zhou, Gong, & Lu, 2013)…”

Section: Introductionunclassified

Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

Lamuela¹

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This Thesis investigates the seismic behavior of reinforced concrete structures consisting of waffle-flat plates supported on isolated columns, without and with hysteretic dampers, subjected to the simultaneous action of two components of the ground motion caused by an earthquake. The methodology applied involves two approaches: the experimental approach (dynamic shaking table tests), and the numerical approach (nonlinear response history analyses with a refined 3D finite element model). The study addresses the response of the structure from the initial elastic stages until collapse. Different parameters are used to characterize the seismic action and to evaluate the response and particular attention is given to the energy.Within the experimental approach, a prototype structure with waffle-flat plates and square columns was first designed following the Spanish structural codes. The structure was assumed to be located in Granada. A portion of this prototype was selected, scaled and built in the Laboratory of Structures of the University of Granada (test specimen). The specimen was tested with a biaxial shaking table using the horizontal components of a far field ground motion. These two components were applied simultaneously, scaled in amplitude to increasing values, until collapse. The analyses of the results allowed to describe in detail the evolution of the response in terms of drifts, rotations in column, forces, local deformations and energy that contributes to damage. Damage concentrated at column bases and at the exterior plate-column connection. The energy input in the structure until collapse under the biaxial seismic action was found very close to that obtained in past tests conducted with a similar specimen subjected to unidirectional seismic loadings. Further, based on the results of the tests, it is proposed to adopt the value = 2 as spectrum reduction factor in force-based seismic design methods.The numerical approach had two parts. The first part consisted on developing a refined 3D finite element model that represented the specimen tested with the shaking table. The model was calibrated with the experimental results to obtain a satisfactory fit between tests results and numerical prediction in terms of displacements and energies. This model was used to conduct a parametric study consisting on nonlinear response history analyses with a large set of ground motions. As a result, the ultimate energy dissipation capacity of this type of structures was evaluated, under uniaxial and under biaxial seismic loadings. In the second part of the numerical study, the model was equipped with displacement-dependent (hysteretic) dampers. A second parametric study was conducted with the new model to evaluate the response and the ultimate energy dissipation capacity of the mixed system. As a global result of the numerical approach, it is concluded that the ultimate energy dissipation capacity of the structure (without or with hysteretic dampers) is a relatively stable amount, scarcely influenced by the characteristic...

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A displacement-based seismic design method for building structures with nonlinear viscoelastic dampers

Zhou

Aguaguiña

Beskos

et al. 2021

Bull Earthquake Eng

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Study on Similarity of Hysteretic Loops and Characteristic Parameters of Viscoelastic Dampers with Test Verifications

Cited by 5 publications

References 1 publication

Experimental characterization and analytical modeling of a large-capacity high-damping rubber damper

Experimental characterization and analytical modeling of a large-capacity high-damping rubber damper

Comportamiento sísmico de estructuras con forjados reticulares y disipadores de energía bajo acción simultánea de dos componentes horizontales del terremoto

A displacement-based seismic design method for building structures with nonlinear viscoelastic dampers

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