Shaking table investigation of inelastic deformation demand for a structure isolated using friction-pendulum sliding bearings

Tsiavos, Anastasios; Markić, Tomislav; Schlatter, David; Stojadinović, Božidar

doi:10.1016/j.istruc.2021.02.040

Cited by 15 publications

(9 citation statements)

References 34 publications

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“…17, the minor increase of the coefficient of the interface in this case led to a smaller sliding displacement for the specimen with more mass in one direction (between t = 10.5 s and t = 11.5 s), which triggered a higher sliding displacement of the specimen with more mass in the other direction. This high sliding displacement of structures subjected to long-period pulses has been experimentally demonstrated by Tsiavos et al (2013Tsiavos et al ( , 2017Tsiavos et al ( , 2021bTsiavos et al ( , 2021c and analytically by Güneş (2022). The insignificant residual sliding displacement of 5 mm in this case demonstrates the efficiency of the lowcost and sustainable energy dissipation device to recenter the structure back to its original position after the end of the excitation for this increased value of the top mass.…”

Section: Influence Of Added Mass On the Responsesupporting

confidence: 69%

Shaking table investigation of a low-cost and sustainable timber-based energy dissipation system with recentering ability

Tsiavos

Kolyfetis

Panzarasa

et al. 2022

Bull Earthquake Eng

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SummaryThe aim of this paper is to demonstrate the efficiency of a low-cost and sustainable timber-based energy dissipation system with recentering ability, which can be used as a seismic isolation system or a tuned mass damper for the seismic protection of structures in developing or developed countries. The system, defined as Dovetail with SPrings (Dove-SP), utilizes the attractive properties of timber to store CO2, thus reducing the carbon footprint of the existing energy dissipation systems: It comprises two timber slabs that are designed to slide against each other in a motion that is restrained by a dovetail sliding joint. Two sliding interfaces that allow this sliding motion at an attractively low friction coefficient are experimentally investigated: A PVC sand-wich (PVC-s) sliding interface, comprising a thin layer of sand that is sand-wiched between two PVC layers and a timber sand-wich sliding interface consisting of a thin layer of sand encapsulated between two beech timber surfaces. A set of low-cost steel springs is designed and installed on both sides of the dovetail joint to recenter the structure back to its original position after the end of an earthquake ground motion excitation. A novel, low-cost and deformable wood material fabricated from delignified balsa wood is used to reduce the pounding effects before the activation of the steel springs. The seismic behavior and the recentering ability of the novel timber-based energy dissipation system subjected to an ensemble of recorded earthquake ground motion excitations was experimentally investigated through a large-scale shaking table investigation at ETH Zurich.

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Section: Influence Of Added Mass On the Responsesupporting

confidence: 69%

Shaking table investigation of a low-cost and sustainable timber-based energy dissipation system with recentering ability

Tsiavos

Kolyfetis

Panzarasa

et al. 2022

Bull Earthquake Eng

Self Cite

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“…For example, Bagheri and Farajian [17] showed that the base isolation may experience an excessive displacement when the system is subjected to near-fault excitations with severe pulses, resulting in a dramatic increase in the displacement of the impulsive mass and, consequently, base shear and overturning moment. The same results were observed through experimental tests conducted on the seismic response of scaled structures isolated by highly efficient, low-cost PVC-Rollers Sandwich seismic isolation [20,21]. Besides, the traditional base isolation devices are less capable of improving the seismic performance of structures built on soft soil and cannot isolate structures from the vertical component of ground motions.…”

Section: Introductionsupporting

confidence: 61%

“…The superscript MF and Tank stand for MetaFoundation and tank system, respectively; u is the displacement of the system relative to the ground; x 2 = (u 2 − u 1 ), x i = (u i − u 1 ), x c = (u c − u 1 ) are displacement of internal, impulsive, and convective masses relative to the external mass, respectively. In Equation (21), the earthquake acceleration is shown by üg, and r is a column vector of one.…”

Section: Governing Equations Of Motion Mf-tank Systemmentioning

confidence: 99%

Effect of MetaFoundation on the Seismic Responses of Liquid Storage Tanks

2022

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Cylindrical liquid storage tanks are vital lifeline structures, playing a critical role in industry and human life. Damages to these structures during previous earthquakes indicate their vulnerability against seismic events. A novel strategy to reduce the seismic demands in the structures is the use of metamaterials, being periodically placed in the foundation, called MetaFoundation (MF). The periodic configuration of metamaterials can create a stop band, leading to a decrease in wave propagation in the foundation. The aim of this paper is to study the effect of MF on the dynamic behaviour of liquid storage tanks. To that end, the governing equations of motion of the liquid storage tank equipped with MF are derived and solved in the time domain to obtain the time history of the responses under a set of ground motions. Then, the peak responses of tanks, mounted on MF, are compared with the corresponding responses in the fixed base condition. Besides, a parametric study is performed to assess the effect of the predominant frequency of earthquakes, the number of layers of metamaterials, the thickness of soft material, and the damping ratios of soft material on the performance of the MF. The obtained results indicate that the MF improves the dynamic behaviour of the squat tank, in which the mean ratio of responses using MF to the ones in the fixed base conditions equals 0.551 for impulsive displacement, overturning moment, and base shear.

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“…Ragni et al [14] presented the seismic damage and collapse risk of seismically isolated buildings, designed according to the Italian seismic code provisions. Tsiavos et al [15] determined analytically and verified experimentally [16,17] the relations between the strength reduction factor Ry, the ductility demand μ and the fixed-based vibration period Tn of seismically isolated structures.…”

Section: Introductionmentioning

confidence: 94%

Inelastic Response Modes of Seismically Isolated Structures: Failure of the Isolators or Damage in the Isolated Structure?

Tsiavos¹,

Markić²,

Schlatter³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The goal of this study is to determine experimentally the inelastic response modes of seismically isolated structures. A steel specimen is designed and constructed to simulate the dynamic behavior of a Single-Degree-Of-Freedom (SDOF) system. The specimen is seismically isolated with four friction pendulum bearings and excited by a group of earthquake ground motion records using the shaking table of ETH Zurich Laboratory. A mechanical clevis connection consisting of two hinges and two replaceable steel coupons is designed and constructed to facilitate the parametric investigation of the inelastic response of the isolated structure for varying values of its strength. Two fundamentally different inelastic response modes have been observed during the excitation of the structure: A response mode dominated by large sliding displacement demand in the isolators and a response mode characterized by large displacement ductility demand in the isolated structure. This paper shows the effect of the design parameters of the isolation system and the isolated structure on the manifestation of these two response modes, thus paving the way for the understanding of the inelastic response of seismically isolated structures subjected to extreme earthquake ground motions.

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Shaking table investigation of inelastic deformation demand for a structure isolated using friction-pendulum sliding bearings

Cited by 15 publications

References 34 publications

Shaking table investigation of a low-cost and sustainable timber-based energy dissipation system with recentering ability

Shaking table investigation of a low-cost and sustainable timber-based energy dissipation system with recentering ability

Effect of MetaFoundation on the Seismic Responses of Liquid Storage Tanks

Inelastic Response Modes of Seismically Isolated Structures: Failure of the Isolators or Damage in the Isolated Structure?

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