Dynamics of a new seismic isolation device based on tribological smooth rocking (TROCKSISD)

Froli, Maurizio; Giresini, Linda; Laccone, Francesco

doi:10.1016/j.engstruct.2019.05.014

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…When the isolated superstructure is considered, an additional degree of freedom, which is the rigid rotation 𝛂 of the base isolator, has to be taken into account. For the 2DOF system (rotation 𝛂 and horizontal displacement 𝒙, Figure 7a), the equations of motion are [24]:…”

Section: Mechanical Features Of the Single Componentsmentioning

confidence: 99%

“…TROCKSISD is an articulated device that protects the superstructure from shocks and vibrations induced by dynamic actions. The conceptual idea of this device, whose design follows the performance based seismic design criteria, is extensively illustrated in [24]. This isolator is suitable to protect from earthquakes or base vibrations slender structures such as towers or art objects of small dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…The scale of the experimental prototype to the full-scale specimen is 1:5. This campaign has the aim of validating the theoretical approach proposed in [24,25] for this class of passive control systems. Section 2 illustrates the experimental tests performed on four superstructures mounted on MT.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation on a passive control system for the mitigation of vibrations on SDOF and MDOF Structures: mini Tribological ROCKing Seismic Isolation Device (miniTROCKSISD)

Giresini

Puppio

Laccone

et al. 2021

Journal of Earthquake Engineering

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This paper illustrates the results of an experimental campaign performed on a scale prototype of a base dissipator called Mini Tribological ROCKing Seismic Isolation Device. This device allows a smooth, controlled and damped rocking by means of frictional layers and viscous elastic springs, which aim to decouple the frequencies of the superstructure, dissipate energy during motion and re-centering the system once the action is removed. Four superstructures are tested -a shear type frame, braced and unbraced, a multi-storey frame and a SDOF oscillatorwith 96 ambient vibration and impulsive tests. An analytical model is illustrated and validated by the experimental tests. The reduction of relative displacement demand is analyzed for all the cases together with the reduction of the acceleration demand, showing positive effects of the base dissipator on the dynamic behavior of all the superstructures.

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Section: Mechanical Features Of the Single Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation on a passive control system for the mitigation of vibrations on SDOF and MDOF Structures: mini Tribological ROCKing Seismic Isolation Device (miniTROCKSISD)

Giresini

Puppio

Laccone

et al. 2021

Journal of Earthquake Engineering

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“…Numerous studies in the field of response control (Fantuzzi et al., 2022; Noureldin et al., 2021) and seismic isolation (Housner et al., 1996; Naeim & Kelly, 1999) have been conducted worldwide (Lin et al., 2010; Saleh & Adeli, 1998), and significant advances in the innovation of these technologies have been made (El‐Khoury & Adeli, 2013; Higashino & Okamoto, 2006). Structural control devices can be classified into three categories: “passive control” (Froli et al., 2019; Narasimhan et al., 2006; Salvatore et al., 2021), “semi active control” (Gutierrez Soto & Adeli, 2019; Naderpoor & Taghikhany, 2022; Shi et al., 2021), and “active and hybrid control” (Bitaraf et al., 2012; Kim & Adeli, 2005a) systems. Recently, in the field of seismic protection, important advancements have been made (Gutierrez Soto & Adeli, 2018; Javidan & Kim, 2022; Xu et al., 2021), and researchers focused their attention on different vibration control technologies such as tuned mass dampers (Kayabekir et al., 2022; Kim & Adeli, 2005b).…”

Section: Introductionmentioning

confidence: 99%

Analysis of seismically‐isolated two‐block systems using a multi–rocking‐body dynamic model

Bisol

DeJong

Liberatore

et al. 2023

Computer aided Civil Eng

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A novel multibody rocking model is developed to investigate the dynamic response of two stacked rigid blocks placed on a linear base isolation device. The model is used to investigate the dynamic response of a realistic statue-pedestal system subject to pulse-like ground motions. The analysis shows that, in general, base isolation increases the safety level of the rocking system. However, for large period pulses or small size blocks, the isolator can amplify the ground motion, resulting in a lower minimum overturning acceleration than for the nonisolated system. Further, the amplification or shock spectrum of a linear mass-dashpotspring oscillator, was found to be the reciprocal of the minimum nondimensional overturning acceleration of the investigated rocking system. Novel rocking spectra are obtained by normalizing the frequency of the pulse by the frequency of the isolator. The analysis also demonstrates how the dynamic response of the two stacked blocks is equivalent to that of a single-block configuration coincident with the whole system assumed monolithic or the upper block alone, whichever is more slender.

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“…Madhekar studied the application of viscous dampers on highway bridges to reduce the bearing displacements and eliminate the isolator damage [6]. The dampers are often combined with the base isolators to improve the seismic reliability of structures [7,8]. Except passive vibration control technologies, active and semiactive approaches are also developed in civil engineering to provide effective protection in earthquakes [9].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Liquid Viscosity for Viscous Dampers through a Wireless Impedance Measurement System

Jia

Luo

2021

Applied Sciences

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Viscous dampers are a type of seismic damping equipment widely used in high-rise buildings and bridges. However, the viscosity of the damping fluid inside the viscous damper will change over time during its use, which significantly reduces the seismic performance of the viscous damper. Hence, it is necessary to monitor the viscosity of the fluid inside the damper over its service life. In this paper, a damping fluid viscosity monitoring method based on wireless impedance measurement technology is proposed. A piezoelectric sensor is installed in a damper cylinder specimen, and the viscosity of the damping fluid is determined by measuring the piezoelectric impedance value of the sensor. In this study, 10 samples of damping fluids with different viscosities are tested. In order to quantitatively correlate damping fluid viscosity and electrical impedance, a viscosity index (VI) based on the root mean square deviation (RMSD) is proposed. The experimental results show that the variation of the real part in the impedance signal can qualitatively determine the damping fluid viscosity while the proposed VI can effectively and quantitatively identify the damping fluid viscosity.

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Dynamics of a new seismic isolation device based on tribological smooth rocking (TROCKSISD)

Cited by 14 publications

References 25 publications

Experimental and numerical investigation on a passive control system for the mitigation of vibrations on SDOF and MDOF Structures: mini Tribological ROCKing Seismic Isolation Device (miniTROCKSISD)

Experimental and numerical investigation on a passive control system for the mitigation of vibrations on SDOF and MDOF Structures: mini Tribological ROCKing Seismic Isolation Device (miniTROCKSISD)

Analysis of seismically‐isolated two‐block systems using a multi–rocking‐body dynamic model

Monitoring of Liquid Viscosity for Viscous Dampers through a Wireless Impedance Measurement System

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