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

Jangid, R. S.

doi:10.1002/stc.3000

Cited by 17 publications

(4 citation statements)

References 50 publications

(92 reference statements)

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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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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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“…Clutching inertia dampers have been extensively studied in recent years as a variable‐inertia model. They have been investigated in various seismic structural systems, 9,11,28 base isolation systems, 29,30 TMD systems, 31,32 and rocking systems 33,34 . The authors mainly focus on the research of clutching inertia devices in seismic structural systems 28,35–37 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic performance of structures with clutching inertia‐damping system: Theoretical study

Liang,

Bai,

et al. 2023

Earthq Engng Struct Dyn

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This paper addresses performance limitations in passive clutching inertia devices due to the absence of flywheel deceleration damping. A solution introducing viscous damping to serve as the flywheel deceleration mechanism is proposed, thus forming the “CIDS” (Clutching Inertia‐Damping System). The study establishes a multi‐body motion analysis model for the CIDS within a single‐degree‐of‐freedom structure. Simulations investigate the impact of control force model parameters on the computation. The impact of additional damping on structural dynamic responses and the system's relative motion is thoroughly elucidated and revealed through dynamic simulations and multi‐body motion decomposition. The “ELS” (Equivalent Linear System) is introduced for the simplified performance assessment of CIDS. Expressions for equivalent damping and inertance are derived based on the equivalence of vibration period and energy in sinusoidal steady‐state vibration. The feasibility and accuracy of ELS for assessing CIDS's performance are validated through response analyses under harmonic and seismic excitations. Notably, displacement indicators exhibit higher precision than acceleration. When subjected to seismic excitation, selecting a more suitable excitation frequency to determine the corresponding equivalent damping can enhance the accuracy of ELS. Considering the frequency dependence of equivalent damping, a frequency‐domain‐based random response evaluation method is proposed. The influence of additional rotational damping, flywheel inertia, and structural natural period on random response is evaluated and analyzed. In CIDS with similar rotational damping and inertia, its control effect is related to the excitation. In summary, this study offers a structured framework for comprehending and evaluating the performance of CIDS, offering valuable insights into its potential engineering design, applications, and analysis.

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“…5 Wang and Sun further analyzed the performance of the ideal model of the clutching inerter in comparison with the inerter and concluded that the clutching inerter improves the control performance of resonant displacement and peak displacement under sinusoidal and seismic excitations. 10 In addition, the performance of the clutching inerter has also been studied in TMD system, 14,15 base-isolated system 16 and rocking system. 17 However, the clutching inerter was analyzed using the ideal model in most studies and there is still no perfect experimental verification on the performance of a real clutching inerter, although Malaga-Chuquitaype et al 18 conducted relevant tests on a pair of 3D printed clutched inerter, only tests under several low-frequency loads were performed due to the limitation of loading.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analyses of structures with supplemental clutching inertia devices

Liang

2022

Earthq Engng Struct Dyn

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Clutching inertia device (CID) is a novel device that incorporates the function of an inerter and the clutching effect that can be provided by a ratchet. In this paper, the performance of an SDOF system with supplemental clutching inertia is investigated through theoretical analyses and experimental tests. First, the dynamic equation for a structure with a CID is built in the form of multi‐body motion. Second, an inertia device (ID), a CID, and an inertia‐enhanced CID (ECID) by reducers are designed for dynamic testing in a small‐scale steel structure. Third, the influence of clutching effect, flywheel inertia and accessory damping of the CID on the structural response is analyzed through a comparative study of numerical simulation and shaking table tests under harmonic and seismic excitation. The results confirm previous predictions that the clutching effect helps to reduce the resonant response of the structure and that the increase in flywheel inertia can further mitigate the resonant response when considering certain accessory damping in the CID. The increase in accessory damping, either viscous damping or friction damping, will obviously reduce the resonant response and resonant frequency of the controlled structure, and the structure with the ECID shows better performance than that of CID when considering the same accessory damping. It is confirmed that the tested CIDs improved the structural seismic performance by slightly prolonging the fundamental structural period and prominently controlling the response in resonant frequency and high frequency owing to the effect of supplemental clutching inertia and accessory damping.

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

Cited by 17 publications

References 50 publications

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

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

Dynamic performance of structures with clutching inertia‐damping system: Theoretical study

Theoretical and experimental analyses of structures with supplemental clutching inertia devices

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