Optimal design and effectiveness evaluation for inerter-based devices on mitigating seismic responses of base isolated structures

Li, Yafeng; Li, Shouying; Chen, Zhengqing

doi:10.1007/s11803-021-2066-z

Cited by 26 publications

(6 citation statements)

References 39 publications

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“…Additionally, it is referred to as a tuned inerter damper (TID) when the TMD mass is replaced with the inerter. The performance of base-isolated structures with TMDI fixed to the isolation floor under both real and stochastic earthquake excitation was examined [3][4][5][6][7][8][9][10][11][12][13]. It was demonstrated that the TMDI reduces the response of base-isolated structures equipped with linear as well as non-linear isolators.…”

Section: Introductionmentioning

confidence: 99%

The Role of a Simple Inerter in Seismic Base Isolation

Jangid

2024

Applied Sciences

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The present study investigates the role of a simple inerter in supplemental devices for possible implementation in the mature seismic base isolation technique. Firstly, the response of the base-isolated structure with an optimally tuned mass damper inerter (TMDI) is investigated to see the tuning effects. The time required to tune the TMDI was found to be significantly longer than the duration of a strong-motion earthquake. There was still a reduction in the response of the isolated structure, which is primarily due to the added damping and stiffness (ADAS) of TMDI and not because of the tuning effects. Hence, it is proposed that the corresponding ADAS of the TMDI be directly added to the isolation device. Secondly, the response of the base-isolated structures to the fluid inerter damper (FID) is studied. It was observed that the inerter of the FID does not influence the displacement variance of an isolated structure under broadband earthquake excitation. It implies that the response of the isolated structure to FID is primarily controlled by its counterpart fluid damper (FD). The performance of optimal TMDI, ADAS, FID, and FD to mitigate the seismic response of the flexible multi-story base-isolated structure under real earthquake excitations is also investigated. In terms of suppressing the displacement and acceleration responses of the isolated structure, it has been found that TMDI and ADAS perform similarly. Comparing the response of the isolated structure with FID and FD demonstrated that the inerter in the FID has detrimental effects on the isolated structures, in which the top floor’s acceleration and base shear are substantially increased.

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Section: Introductionmentioning

confidence: 99%

The Role of a Simple Inerter in Seismic Base Isolation

Jangid

2024

Applied Sciences

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“…Although the original structure response is greatly reduced, a large deformation induced by the earthquake ground motion will occur on the base foor, thus the superstructure might face collapse risk when experiencing an extremely rare earthquake. Hence, hybrid base isolation systems, which combine isolation bearings and passive dampers, receive increasing attention [7][8][9][10][11] and intend to tackle the challenges of overlarge base deformation of the BIS during extremely rare earthquakes while maintaining or reducing superstructure responses.…”

Section: Introductionmentioning

confidence: 99%

Stochastic Optimization of a Nonlinear Base Isolation System with LRB and EIMD for Building Structures

Wang

Shen

Zhu

et al. 2023

Structural Control and Health Monitoring

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Base-isolated structures achieve superior seismic performance but with the cost of large deformation of the base floor, which possibly causes superstructure collapse during severe earthquakes. Hence, it is of great interest to develop hybrid base isolation systems that can reduce the base deformation and simultaneously improve the superstructure’s performance. Recently, several hybrid base isolation systems using inerter-based dampers have emerged; however, the nonlinear performance of the isolators has rarely been considered in these studies. In this paper, we conduct a nonlinear stochastic optimization of a novel hybrid base isolation system with lead-rubber bearings (LRB) and electromagnetic inertial mass dampers (EIMD). Based on the Bouc–Wen hysteretic model of the LRB, we derive the semianalytical solutions of the response variances of a simplified base-isolated model subjected to stationary seismic excitations. Then, based on the semianalytical solutions, we propose a procedure for optimizing the EIMD aimed at minimizing the superstructure interstory drift. In addition, we investigate the effect of site conditions and postyielding to preyielding stiffness ratios of the LRB on the optimal EIMD parameters and corresponding seismic performance. It is found that the hybrid base isolation system achieves better performance at a soft site than at a firm site. Results of a hybrid base-isolated building under artificial and real earthquake excitations illustrate that the EIMD can reduce both the base deformation and superstructure response, which outperforms the hybrid base-isolated building with conventional viscous dampers (VD).

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“…Using nonlinear stochastic and deterministic time history analysis, the effectiveness of the fluid inerter for buildings isolated with curved surface sliders was also demonstrated 24 . The dynamic behavior and optimal parameters of a base‐isolated structure with electromagnetic inertial mass dampers are presented by Wang et al 25 The performance of a tuned inerter damper and the optimum parameters for controlling the seismic response of isolated structures are also studied 26–28 . The energy dissipation capacity of the damper within the inerter system for seismically isolated structures is investigated by Pan et al 29 It is also demonstrated experimentally that a simplified linear dissipative model, rather than a nonlinear model with friction and gear backlash, can be used to achieve acceptable accuracy in the response of base‐isolated structures supplemented with TMDI 30 .…”

Section: Introductionmentioning

confidence: 99%

Performance and optimal design of base‐isolated structures with clutching inerter damper

Jangid

2022

Structural Contr & Hlth

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The performance and optimal design of the base-isolated structure supplemented with clutching inerter damper (CID) subjected to seismic loading are investigated. Because of the nonlinear force-deformation behavior of the CID, the stochastic response of the isolated structure subjected to nonstationary earthquake excitation is obtained using the time-dependent equivalent linearization technique. To investigate the effects of nonstationary earthquake characteristics, the isolated structure's nonstationary response is compared to the corresponding stationary response. For a given isolated structural system and excitation, there exists an optimum value of the CID inertance at which the root mean square absolute acceleration of the superstructure achieves a minimum value. The effects of key parameters like superstructure flexibility, isolation period, and isolation damping ratio on the CID's optimal inertance are examined. The seismic response of base-isolated structures is also obtained under real earthquakes using the nonlinear model of the CID. The effects of the CID on the response of isolated structures under real earthquakes were found to be well correlated with those of stochastic analysis.Finally, for the approximate response and initial design of base-isolated structures, a closed-form expression for the equivalent damping of the CID is proposed. Using the equivalent inertance and damping of the CID, the bearing displacements and forces of isolated structures with the CID were found to be matching with that obtained by the nonlinear analysis. However, there can be

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Optimal design and effectiveness evaluation for inerter-based devices on mitigating seismic responses of base isolated structures

Cited by 26 publications

References 39 publications

The Role of a Simple Inerter in Seismic Base Isolation

The Role of a Simple Inerter in Seismic Base Isolation

Stochastic Optimization of a Nonlinear Base Isolation System with LRB and EIMD for Building Structures

Performance and optimal design of base‐isolated structures with clutching inerter damper

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