Hybrid Passive Control Strategies for Reducing the Displacements at the Base of Seismic Isolated Structures

Matteo, Alberto Di; Masnata, Chiara; Pirrotta, Antonina

doi:10.3389/fbuil.2019.00132

Cited by 14 publications

(5 citation statements)

References 34 publications

(39 reference statements)

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“…As a matter of fact, in many cases, the effect of passive TLCDs in controlling the peak response of structures under seismic motions is not significant (e.g. figure 1) [27,[54][55][56][57][58]. To simplify the analysis, here we assume that ξ p = 0, and thus E p = E u = 50 mm.…”

Section: Objective Function ξO and Determination Of Phase Lag αmentioning

confidence: 99%

Event-triggered semi-active TLCD for ground motion-induced vibration control

Ding,

Zhang,

Song

et al. 2024

Smart Mater. Struct.

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One potential drawback of tuned liquid column dampers (TLCDs) is their relatively low control efficiency during the initial stage of structural vibration caused by external excitations. This is because satisfactory control effects can only be achieved when the liquid inside TLCD is fully oscillating, which is not the case during the initial stage. To solve this problem, in this study, an event-triggered semi-active technique is creatively proposed to improve the vibration reduction efficiency of TLCDs during the initial stage. The fundamental idea of the proposed approach is to provide an initial displacement to the liquid column via baffles, and then release the constraints on the initial liquid displacement at an appropriate time to achieve the rapid activation of TLCDs. A strategy from the standpoint of phase difference between liquid column motion and structural motion is proposed to determine the triggering conditions (i.e., when to release the constraints). The effectiveness of the proposed semi-active system is examined under both harmonic and stochastic excitations. The results show that the proposed strategy successfully improves the vibration suppression performance of TLCDs in the early stage of structural vibration.

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Section: Objective Function ξO and Determination Of Phase Lag αmentioning

confidence: 99%

Event-triggered semi-active TLCD for ground motion-induced vibration control

Ding,

Zhang,

Song

et al. 2024

Smart Mater. Struct.

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“…Hybrid dampers also fit within the topic of smart dampers. Hybrid damping systems most commonly combine base isolation in the form of seismic isolators with traditional damping technologies [19]. These hybrid dampers can make use of active or passive damping, and their use is currently gaining scientific attention.…”

Section: Smart Dampersmentioning

confidence: 99%

A Novel Solution to Find the Dynamic Response of an Euler–Bernoulli Beam Fitted with Intraspan TMDs under Poisson Type Loading

et al. 2020

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This contribution considers a virtual experiment on the vibrational response of rail and road bridges equipped with smart devices in the form of damping elements to mitigate vibrations. The internal damping of the bridge is considered a discontinuity that contain a dashpot. Exact complex eigenvalues and eigenfunctions are derived from a characteristic equation built as the determinant of a 4 × 4 matrix; this is accomplished through the use of the theory of generalized functions to find the response variables at the positions of the damping elements. To relate this to real world applications, the response of a bridge under Poisson type white noise is evaluated; this is similar to traffic loading that would be seen in a bridge’s service life. The contribution also discusses the importance of smart damping and dampers to sustainability efforts through the reduction of required materials, and it discusses the role played by robust mathematical modelling in the design phase.

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“…Nevertheless, BI structures may experience high displacements and accelerations at the base during unfavorable seismic excitations [2]. To address this issue, many studies have considered the application of the so-called hybrid control strategies [3], based on the combination of BI systems with additional energy dissipation mechanisms properly tuned to the natural frequency of the BI system. The concept arose from the observation that the response of well-isolated systems is dominated by the firstmodal contribution, and that the most common absorbers, such as the Tuned Mass Dampers (TMDs) and Tuned Liquid Column Dampers (TLCDs) passive control devices, are particularly effective at reducing this fundamental vibration mode.…”

Section: Introductionmentioning

confidence: 99%

“…Performance of the hybrid-controlled structureFinally, the dynamic behavior of the hybrid-controlled system equipped with the STLCD is studied and its performance control is experimentally assessed in comparison to three types of structures: the BI structure equipped with the corresponding fixed TLCD (Figure6(b)), the BI structure endowed with a TMD with the same STLCD mass ratio (Figure6(c)), and the benchmark BI structure without devices, previously analyzed in Section 4.1. The TMD device was tuned according to the classical formulation proposed by Den Hartog[4] and an analogous identification procedure was applied to the TLCD and STLCD (details about the mathematical model, here omitted for brevity, can be found in[3]).…”

mentioning

confidence: 99%

Sliding TLCD for vibration control of base-isolation systems: experimental comparison with traditional TLCD and TMD

Masnata,

Di Matteo,

Adam

et al. 2024

J. Phys.: Conf. Ser.

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In the context of hybrid passive vibration control, the effectiveness of the Tuned Liquid Column Damper (TLCD) for seismic protection of base-isolated (BI) systems has been demonstrated both numerically and experimentally. In contrast to the previous studies on TLCDs, the present study explores the possibility of equipping a BI system with a sliding model of TLCD (STLCD), until now introduced only for the suppression of wind-induced vibrations of fixed-base structures. Specifically, the proposed STLCD consists of a U-shaped tank partially filled with water, mounted on a roller support and connected to the BI system via a spring-dashpot system. The validity of the introduced mathematical model is assessed by means of an extensive shaking table testing campaign at the Laboratory of Experimental Dynamics at the University of Palermo, Italy. For the experimental tests, a small-scale model of a single-degree-of-freedom (SDOF) BI structure with the STLCD is constructed, and the effectiveness of the proposed combined control strategy is experimentally evaluated. Finally, comparisons with traditional TLCDs and TMDs are made and the control efficiency is discussed with emphasis on the reduction of the accelerations of the BI system.

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Hybrid Passive Control Strategies for Reducing the Displacements at the Base of Seismic Isolated Structures

Cited by 14 publications

References 34 publications

Event-triggered semi-active TLCD for ground motion-induced vibration control

Event-triggered semi-active TLCD for ground motion-induced vibration control

A Novel Solution to Find the Dynamic Response of an Euler–Bernoulli Beam Fitted with Intraspan TMDs under Poisson Type Loading

Sliding TLCD for vibration control of base-isolation systems: experimental comparison with traditional TLCD and TMD

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