Experimental and numerical study of a brace-type hybrid damper with steel slit plates enhanced by friction mechanism

Thin-Walled Structures, Journal Year: 2022, Volume and Issue: 182, P. 110249 - 110249

Published: Nov. 5, 2022

Language: Английский

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Frequency independent damped outrigger systems for multi‐mode seismic control of super tall buildings with frequency independent negative stiffness enhancement

Earthquake Engineering & Structural Dynamics, Journal Year: 2023, Volume and Issue: 52(9), P. 2731 - 2754

Published: April 24, 2023

Abstract Damped outrigger system is effective for improving energy dissipation tall buildings. However, conventional damped (CDO) with viscous damping has two limitations: (i) its maximum ratio cannot be improved when outrigger/column stiffness inadequate; (ii) different modes achieve their ratios at values, and thus the dampers optimized to simultaneously reduce vibrations of multiple concern minimum. In this paper, a purely frequency‐independent negative (FI‐NSDO) proposed by combining damper (FID) device (NSD). The FID can all as compared frequency‐dependent like damper. As NSD features assisting enhancing motion frequency‐independence, utilization will considerably improve inadequate maintain feature whole system. Therefore, FI‐NSDO capability increasing target values. Analysis in frequency domain time domain, demonstrate that performs better controlling multi‐mode vibration seismic responses.

Language: Английский

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Seismic control of a smart structure with semiactive tuned mass damper and adaptive stiffness property

Earthquake Engineering and Resilience, Journal Year: 2023, Volume and Issue: 2(1), P. 74 - 93

Published: March 1, 2023

Abstract To reduce structural responses under earthquake excitations effectively and improve their resilience, a smart structure with semiactive tuned mass damper (STMD) on the top story adjustable stiffness device (SASD) first which contributes to adaptive property is developed in this study. The SASD consists of diamond spring composed four linear springs an electromagnetic actuator, can change angle therefore retune stiffness. Two typical STMDs previously are reviewed first, device‐based STMD variable damping pendulum‐type frequency eddy current damping, respectively. Numerical results show that proposed has better control performance than passive‐tuned or acting independently. enhance seismic protection further, based principle base isolation, applied story. quadratic Gaussian‐based algorithm for proposed. A 10‐story building presented as case range discussed detail, while it found ±50% achieves best mitigation. Control effects different numbers implemented along height compared well. increase number SASDs, mitigation effect better; however, magnitude decreasing. combined excellent Meanwhile, combination similar SASDs installed from fourth story, respectively, additional electromechanical systems influence use function building.

Language: Английский

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Adaptive Stiffness Structures with Dampers: Seismic and Wind Response Reduction Using Passive Negative Stiffness and Inerter Systems

Journal of Structural Engineering, Journal Year: 2022, Volume and Issue: 148(11)

Published: Aug. 31, 2022

High-rise structures and large-span bridges have low vibration frequencies intrinsic damping hence are subjected to multimode vibrations under environmental excitation. Supplementing is a viable means suppress such vibrations. The amount of supplemental nevertheless limited as the devices in practice can only be attached structure at positions while displacements or relative small. Introducing negative stiffness, passively by stiffness (NSDs) inerters, device an effective enhancement approach. This study focuses on effects dampers enhanced NSDs inerters for flexible structures, with emphasis frequency-independence (NSDs)/dependence (inerters) introduced stiffness. Tall buildings/bridges outrigger systems incorporating (NSDOs) (IDOs) taken examples demonstration response mitigation performance. First, principle equal modal applied tuning IDOs achieve maximal target mode. Then, equivalent NSDO determined same level Subsequently, ratios first several modes compared building respectively tuned NSDOs. results show that when particular mode (e.g., second mode) almost no effect lower (first mode)—as what achieved conventional damped outriggers (CDOs). tend lock motion between perimeter columns higher structural because their frequency dependence. However, NSDOs comparable all CDOs independence. It also found it might preferable use small inertance requires large absolute value, although adding levers values demonstrated recently author. findings been confirmed numerical analyses typical seismic wind loading. Practical implementable NSD rate-independent developed based classical Maxwell—Weichert model help mitigate modes, which subject future study.

Language: Английский

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Adaptive Passive Negative Stiffness and Damping for Retrofit of Existing Tall Buildings with Tuned Mass Damper: TMD-NSD

Journal of Structural Engineering, Journal Year: 2022, Volume and Issue: 148(11)

Published: Sept. 7, 2022

It is known that the performance of traditional passive tuned mass dampers (TMDs) highly sensitive to vibration frequency. The fundamental frequency existing tall buildings may shift lower value due damage or other reasons. In this regard, paper deals with resultant detuning problems a TMD for control by retrofitting it adaptive negative stiffness device (NSD). applied NSD not only provides adjusting TMD's de-tuned at its working stage, but also offers fail-safe limiting stop large deformation/stroke. study, compared original TMD, novel TMD-NSD assembly proposed shown be more effective serviced structures. For example, can provide about 2.83% additional damping ratio frequency-changed structures, while newly further improves 5.34%. Moreover, in study found outperforms resisting dynamic lateral loading such as along winds, cross and earthquakes.

Language: Английский

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Experimental and numerical investigations on seismic responses of wind turbine structures with amplifying damping transfer system

Soil Dynamics and Earthquake Engineering, Journal Year: 2023, Volume and Issue: 175, P. 108277 - 108277

Published: Oct. 11, 2023

Language: Английский

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Multiple hazards vibration control of jacket offshore wind turbines equipped with amplifying damping transfer systems: Winds, waves, and earthquakes

Ocean Engineering, Journal Year: 2023, Volume and Issue: 285, P. 115355 - 115355

Published: July 14, 2023

Language: Английский

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Metamaterial beams with negative stiffness absorbers and rotation: band-gap behavior and band-gap merging

Engineering Structures, Journal Year: 2023, Volume and Issue: 280, P. 115702 - 115702

Published: Feb. 10, 2023

Language: Английский

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Concept and numerical analysis of a double-stage coupling damper for multilevel seismic protection

Thin-Walled Structures, Journal Year: 2023, Volume and Issue: 185, P. 110581 - 110581

Published: Feb. 2, 2023

Language: Английский

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Root-Locus Optimal Formula for Seismic Control of Multi-Story Structures Equipped with Tuned Mass Damper Inerter Enhanced by Negative Stiffness Considering Non-resonant Mode Contributions

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112203 - 112203

Published: Feb. 1, 2025

Language: Английский

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