Sliding implant‐magnetic bearing for adaptive seismic mitigation of base‐isolated structures

Peng, Yongbo; Huang, Tianchen

doi:10.1002/stc.2431

Cited by 19 publications

(10 citation statements)

References 39 publications

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“…Various types of base isolation strategies, such as the elastomeric type bearings, sliding bearings, and rolling bearings, have been proposed [6]. Also, different active and semiactive seismic isolation strategies have attracted researchers' attention in recent years [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Zelleke

Saha

Matsagar

2020

Shock and Vibration

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The issues of safety and posthazard functionality of structures under multihazard scenarios are some of the significant challenges in the current dynamic and rapidly growing urban environment. In this paper, multistory base-isolated buildings are investigated under the independent multihazard scenario of earthquake and blast-induced ground motion (BIGM). Multistory building models equipped with five different types of isolation systems, namely, the laminated rubber bearing (LRB), lead-rubber bearing (N-Z system), pure friction (PF) system, friction pendulum system (FPS), and resilient-friction base isolator (R-FBI) are assessed under bidirectional multihazard excitations. The suitability of the isolation systems and their key parameters in protecting multistory buildings is evaluated. Furthermore, the influence of the superstructure characteristics, such as the superstructure damping and the number of stories, is also assessed. The effect of bidirectional hazards on fixed-base buildings is also presented for comparison. The key response quantities of base-isolated buildings are presented and compared for different isolation systems. Parametric investigations are also conducted, and the trends of the response quantities are presented to study the influence of important parameters of isolation systems in protecting the buildings under the multihazard scenario of earthquake and BIGM. The results of the investigation show that the behaviors of the buildings equipped with various isolation systems are different for the two hazards. Moreover, the influences of the key parameters of the isolation systems are found to be different for various hazards. Therefore, the selection of design parameters of isolation systems shall be made with due consideration of the influence of multiple hazards. Additionally, the influence of the properties of the superstructure, such as the number of stories and the damping of the superstructure, on the behavior of the base-isolated buildings under the multihazard loading, is presented.

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Section: Introductionmentioning

confidence: 99%

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Zelleke

Saha

Matsagar

2020

Shock and Vibration

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“…Alternatively, hybrid control strategies combining the isolation system with a tuned mass damper (TMD) [15]- [17] or enhanced variants with an inerter [18]- [21], located above or below the isolation layer, have been proposed. Sliding hydromagnetic bearings and sliding implantmagnetic bearings also represent a promising solution providing adaptive energy dissipation and alterable deflection constraint, as recently shown in experimental tests [22] and numerical simulations [23], [24]. Another straightforward solution consists in providing supplemental damping in addition to the inherent damping of the isolators, e.g., by means of fluid viscous dampers, although this strategy was shown to increase the higher mode response and, consequently, to produce higher interstory drifts and floor accelerations in the superstructure [25].…”

Section: Introductionmentioning

confidence: 89%

Effective base isolation combining low-friction curved surface sliders and hysteretic gap dampers

Domenico

Gandelli

Quaglini

2020

Soil Dynamics and Earthquake Engineering

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The re-centering capability represents a fundamental property of any effective isolation system. Indeed, a potential residual displacement after an earthquake, besides affecting the serviceability of the construction, may also result in increased peak displacements during aftershocks and future events. In curved surface sliders (CSSs), energy dissipation and re-centering capability are two competing aspects influenced by the friction coefficient and the state of lubrication of the sliding pad. On the one hand, the large energy dissipation capability of high-friction CSSs contributes to mitigate the displacement demand during strong events but negatively affects the re-centering behavior. On the other hand, low-friction CSSs exhibit a better re-centering behavior, but are expected to undergo large displacements that, in turn, imply large dimensions in plan and pose problems of possible pounding between adjacent buildings and damage of nonstructural elements, lifelines and utilities crossing the isolation joint. The present study proposes an efficient baseisolation system that combines low-friction CSSs with hysteretic gap dampers. The latter device introduces supplemental energy dissipation only when the displacement of the isolation system exceeds a threshold or initial gap while not being engaged otherwise. The mechanical properties of the gap damper are designed to provide a target energy dissipation such that the displacement demand of low-friction CSSs can be kept to the same level as that of high-friction CSSs. A parametric study comprising a series of nonlinear response history analyses and different CSS characteristics demonstrates that the supplemental dissipative mechanism of the gap damper does not impair the re-centering capability of the CSS isolators. These outcomes are additionally validated by comparing numerical simulations of a 3D base-isolated case-study frame with shake-table test results. The proposed base-isolation system efficiently combines satisfactory energy dissipation, which reduces the displacement demand, with high re-centering capability resulting in negligible residual displacements.

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“…Peng and Huang proposed to implant permanent magnets and elastomer fillings to the regular isolators. is new isolator was named the implant-magnetic bearing (IMB) and had been proved effective in mitigating the story accelerations and interstory drifts via both numerical studies [5] and experimental tests [6,7]. Zheng [8] introduced the shape memory alloys (SMA) into the LRB system and proposed a superelasticsliding lead rubber bearing (SSLRB) isolation system.…”

Section: Introductionmentioning

confidence: 99%

Seismic Vibration Mitigation of a Cable-Stayed Bridge with Asymmetric Pounding Tuned Mass Damper

Zhang

Tan

Liu

et al. 2021

Mathematical Problems in Engineering

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In order to mitigate the seismic response of a cable-stayed bridge, a new type damping device named asymmetric pounding tuned mass damper (APTMD) is developed in this paper on the basis of the traditional symmetric pounding tuned mass damper. The novel APTMD has three parameters to be determined: the left-side gap, the right-side gap, and the frequency ratio. A numerical model of the APTMD damping system is established with consideration of both the computational efficiency and accuracy to enable the parametric optimization of the damper. The numerical model is based on a simplified model of the cable-stayed bridge and a nonlinear pounding force model. The genetic algorithm is utilized for the optimization of the damper. Afterwards, the cable-stayed bridge is subjected to 20 recorded ground motions to evaluate the vibration control effectiveness of the APTMD. Four systems are considered: (1) without dampers; (2) with a TMD; (3) with a PTMD; and (4) with an APTMD. Time history analysis reveals the following: (1) those dampers can all effectively suppress the vibration of the bridge and (2) the vibration control effectiveness of the APTMD is slightly better than the TMD and the PTMD.

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Sliding implant‐magnetic bearing for adaptive seismic mitigation of base‐isolated structures

Cited by 19 publications

References 39 publications

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Effective base isolation combining low-friction curved surface sliders and hysteretic gap dampers

Seismic Vibration Mitigation of a Cable-Stayed Bridge with Asymmetric Pounding Tuned Mass Damper

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