Rate-Independent Linear Damping for the Improved Seismic Performance of Inter-Story Isolated Structures

Keivan, Ashkan; Zhang, Ruiyang; Keivan, Darioush; Phillips, Brian M.; Ikenaga, Masahiro; Ikago, Kohju

doi:10.1080/13632469.2019.1693444

Cited by 12 publications

(5 citation statements)

References 29 publications

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“…Faiella et al (2022) used the inter-story isolated system to retrofit a masonry structure and succeeded in significantly reducing the seismic response. Keivan et al (2022) demonstrated the rate-independent linear damping of a 14-story inter-story isolation structure using a numerical model and real-time hybrid simulation of shaking table.…”

Section: Open Access Edited Bymentioning

confidence: 99%

Reliability analysis of an inter-story isolated structure under a main-aftershock sequence based on the Laplace asymptotic method

Yang

Wang

et al. 2023

Front. Earth Sci.

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After a strong mainshock, subsequent ground motion is the result of a sequence of multiple aftershocks, and the damage to a structure under these conditions is more severe than from a single earthquake. Most seismic studies are based on a single earthquake event. To explore the influence of a main-aftershock sequence on an isolated inter-story structure, we constructed a three-dimensional finite-element model of such a structure and subjected it to repeated main-aftershock sequences. The Laplace asymptotic method of second-order second-moment was used to calculate the reliability of the structure under the action of a single mainshock and after a main-aftershock sequence at different seismic levels. The effects of the number of aftershocks, the location of the isolation layer, and the stiffness of the isolation bearing in the structure were analyzed. The results showed that aftershocks increased the failure probability of each sub-structural part of the inter-story isolated structure. The failure probability of the lower structure had the greatest influence, which was about 3.89 times that for the mainshock alone. The probability of failure from multiple vs single aftershocks was similar, but the magnitude of the aftershock plays a major role in failure. The number of aftershocks reduced the overall reliability of an inter-story isolation structure. In the case of different isolation layer positions, the placement of the isolation layer at the top of the seventh story under an extremely rare earthquake level resulted in a reduction of 6.01%. With isolation bearings of different stiffness, the largest decrease was 7.88% when the stiffness was 50%.

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Section: Open Access Edited Bymentioning

confidence: 99%

Reliability analysis of an inter-story isolated structure under a main-aftershock sequence based on the Laplace asymptotic method

Yang

Wang

et al. 2023

Front. Earth Sci.

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“…Keivan et al [25,26] approximated the RILD storage stifness using a digital flter. Keivan et al [27] then incorporated the proposed flter into the interstory isolated structure without considering the impact of vertical vibrations. Liu and Ikago [28] proposed a modifed RILD model that could achieve better performance in terms of mimicking the loss stifness.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of a Novel Modal Decomposition Method for Low‐Frequency Structure with Nonproportionally Distributed Rate‐Independent Linear Damping

Liu,

Ni,

2024

Structural Control and Health Monitoring

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Compared with conventional linear viscous damping (LVD), rate-independent linear damping (RILD) mitigates floor response acceleration in low-frequency structures more effectively without compromising the control performance of displacement responses during long-period or low-frequency earthquakes. Although theoretical and experimental attempts have been made to overcome the noncausality of RILD devices and realize RILD using passive or semiactive devices, only a few studies have highlighted the impulse-response precursor and modal analysis method of multistory structures incorporated into RILD devices. This study investigated the impulse-response precursor of a noncausal RILD system and proposed a novel modal decomposition method for the structures equipped with nonproportionally distributed RILD devices. Additionally, real-time hybrid simulation was conducted to validate the effectiveness of the proposed modal analysis method and the feasibility of realizing ideal RILD using mechanical devices. This study is the first to demonstrate the differences between RILD and LVD devices in terms of controlling the modal responses of low-frequency structures and how RILD can lower the floor response acceleration more effectively compared to LVD.

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“…[20][21][22][23][24][25][26][27][28][29] Furthermore, there have been attempts to mimic RILD using fractional-order models. [30][31][32][33][34] Keivan et al 35,36 proposed a first-order all-pass filter to causally approximate RILD. Their proposed digital filter is useful for controlling a magnetorheological damper.…”

Section: Introductionmentioning

confidence: 99%

Performance of a passive rate‐independent damping device in a seismically isolated multistory building

Liu

Ikago

2022

Structural Contr & Hlth

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Summary In the 2011 Great East Japan Earthquake, low‐frequency components of ground motion brought long‐duration shaking to high‐rise buildings in mega‐cities far from the epicenter, resulting in damage to their interior and exterior walls, and unsafe conditions for the building occupants. Rate‐independent linear damping (RILD) has been suggested as a viable option for simultaneously reducing the excessive displacement and floor response acceleration of a low‐frequency structure. While the majority of previous studies on RILD have mainly focused on theoretical and mathematical approaches, the practical applications of RILD have not been extensively investigated. In this regard, this study aims to experimentally and analytically investigate the physical implementation of RILD for the protection of a multistory low‐frequency structure. The effectiveness of the proposed passive causal RILD device, comprising a Maxwell‐type damper and negative stiffness, incorporated into a seismically isolated building was investigated based on real‐time hybrid simulation. Under strong ground motions, the passive causal RILD device could greatly reduce the floor response accelerations in the seismically isolated structure, compared with a linear viscous damping device.

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Rate-Independent Linear Damping for the Improved Seismic Performance of Inter-Story Isolated Structures

Cited by 12 publications

References 29 publications

Reliability analysis of an inter-story isolated structure under a main-aftershock sequence based on the Laplace asymptotic method

Reliability analysis of an inter-story isolated structure under a main-aftershock sequence based on the Laplace asymptotic method

Feasibility Study of a Novel Modal Decomposition Method for Low‐Frequency Structure with Nonproportionally Distributed Rate‐Independent Linear Damping

Performance of a passive rate‐independent damping device in a seismically isolated multistory building

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