A review of rolling-type seismic isolation: Historical development and future directions

Harvey, P. Scott; Kelly, Karah

doi:10.1016/j.engstruct.2016.07.031

Cited by 78 publications

(34 citation statements)

References 48 publications

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“…Similar to a large number of successful applications of seismic isolation to building and bridge structures, recently, implementation of seismic isolators, instead of conventional restraints, to mitigate the seismic risk and enhance the seismic performance of important equipment or facilities has been increased extensively. Among various types of seismic isolators, rolling‐based metallic seismic isolators, in which either a ball rolls on concave or conical surfaces or a rod rolls on curved or sloped surfaces (or rails), have the advantages of very limited rolling friction force and inherent gravity‐based self‐centering capability, respectively, during and after excitation over other types of seismic isolators . Accordingly, the in‐plane seismic isolation performance can be activated immediately once an earthquake occurs, the horizontal acceleration transmitted to the protected object can be effectively reduced during an earthquake, and the protected object and seismic isolators can effortlessly return to their original (or equilibrium) position.…”

Section: Introductionmentioning

confidence: 99%

“…Among various types of seismic isolators, rolling-based metallic seismic isolators, in which either a ball rolls on concave 6,[9][10][11] or conical 12,13 surfaces or a rod rolls on curved 7,14,15 or sloped [16][17][18][19] surfaces (or rails), have the advantages of very limited rolling friction force and inherent gravity-based self-centering capability, respectively, during and after excitation over other types of seismic isolators. 20 Accordingly, the in-plane seismic isolation performance can be activated immediately once an earthquake occurs, the horizontal acceleration transmitted to the protected object can be effectively reduced during an earthquake, and the protected object and seismic isolators can effortlessly return to their original (or equilibrium) position. In addition, this kind of seismic isolators has less dependence on the weight of the protected objects and limited impact on the existing working conditions (e.g., clearness and maintenance issues), which greatly promotes their applications in engineering practice.…”

Section: Introductionmentioning

confidence: 99%

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Effects of design and seismic parameters on horizontal displacement responses of sloped rolling‐type seismic isolators

Wang

Cho

et al. 2019

Struct Control Health Monit

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Summary The influences of design parameters, including sloping angles of bearing plates and friction damping forces, together with seismic parameters, including corner periods and effective peak accelerations that are usually used for characterizing a design response spectrum, on the maximum horizontal displacement responses of sloped rolling‐type seismic isolators are numerically discussed in this study. Because the seismic isolators feature the constant acceleration control (or zero postelastic stiffness) performance, the equivalent linear model conventionally adopted in the equivalent lateral force procedure might not be adequate for predicting their maximum horizontal displacement response under a given seismic demand. Therefore, considering a small number to a large number of coefficients, several statistics‐based empirical formulas that are able to approximate their maximum horizontal displacement response are proposed. Not only the accuracy but also the conservative property of the proposed empirical formulas are discussed by comparing their predictions with the nonlinear response history analysis results. To efficiently determine the horizontal displacement capacity of sloped rolling‐type seismic isolators during the preliminary design stage, the statistics‐based empirical formula considering a reasonable number of coefficients is recommended.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of design and seismic parameters on horizontal displacement responses of sloped rolling‐type seismic isolators

Wang

Cho

et al. 2019

Struct Control Health Monit

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“…Many scholars have paid attention to rolling-type systems for seismic isolation during the past years, and many different rolling-type mechanisms have been proposed [1][2][3][4][5][6][7]. e previous models were all built based on rigid contact [8]. Natural frequency is one of the most important indexes used to evaluate the performance of an isolator.…”

Section: Introductionmentioning

confidence: 99%

Study on the Rolling‐Type Microvibration Isolation Mechanisms Based on Completely Elastic Contact

Guan

Zhu

et al. 2019

Shock and Vibration

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e previous models of rolling-type mechanisms were built based on rigid contact and pure rolling motion, but when applied to ground microvibration isolation, a large error in the natural frequency was sometimes observed in the experiments. A new model of a common mechanism based on completely elastic contact is developed, and the expression of the natural frequency is provided under a microvibration condition. e experiments and analysis show that the proposed model is more accurate than the previous model, and the natural frequency is independent of the payload. e analysis shows that the proposed model is only suitable in the range of completely elastic contact, and the load range is provided after comparing the experimental results with existing theory.

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“…As a critical part, the optical switch is highly sensitive to vibration and cannot operate properly even under tiny disturbances. 1,2 In general, the switch works with other equipment in the cabinet, thus the vibrational energy caused by ground excitation transmitted to the switch would be amplified due to the flexibility of the cabinet structure. In order to protect the optical switch from the vibration disturbances, an effective vibration isolation solution is needed urgently.…”

Section: Introductionmentioning

confidence: 99%

Performance of a low-frequency hybrid vibration isolation platform for vibration-sensitive devices

Xie

Diao

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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For preventing the fragile optical communication devices from malfunction caused by the low-frequency seismic excitation, a novel three-dimensional hybrid isolation platform is proposed in this paper. To isolate the horizontal and vertical vibrations simultaneously, the platform is designed as a combination of a rolling isolation system and four threeparameter isolators with active damping. By deriving the governing equations of the three-parameter isolators and the profile of the concave rolling surface, the dynamic model of the whole platform is constructed. Numerical results indicate that the isolation platform has an effective suppression of the horizontal and vertical vibrations. To verify the isolation performance of the hybrid isolation platform, an experiment is conducted in the targeting frequency range. Compared to the amplification factor of 6.2 dB of the three-parameter isolator, the test results exhibit that the hybrid isolation shows no amplification effect in the vertical direction, and the root mean square value of acceleration responses can be decreased by more than 65% in the frequency range of 0-32 Hz. In the horizontal direction, the reduction of the root mean square value of acceleration responses is up to 85% in the same frequency range.

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A review of rolling-type seismic isolation: Historical development and future directions

Cited by 78 publications

References 48 publications

Effects of design and seismic parameters on horizontal displacement responses of sloped rolling‐type seismic isolators

Effects of design and seismic parameters on horizontal displacement responses of sloped rolling‐type seismic isolators

Study on the Rolling‐Type Microvibration Isolation Mechanisms Based on Completely Elastic Contact

Performance of a low-frequency hybrid vibration isolation platform for vibration-sensitive devices

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