Vulnerability assessment methods for rocking and overturning of free standing elements

Bertó, Luisa; Rocca, Irene; Saetta, Anna

doi:10.1016/j.soildyn.2018.02.010

Cited by 12 publications

(6 citation statements)

References 17 publications

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“…2021, 24 and Berto et al. 2018, 35 among others. The outcomes of the present experimental study show that PGV/PGA may lead to rocking initiation.…”

Section: Further Investigations On the Experimental Outcomes For The ...mentioning

confidence: 92%

“…Fragility curves were derived analytically and then compared to the experimental results. Similar approaches for assessing experimentally typical freestanding building contents were also adopted by Petrone et al, 34 Berto et al, 35 Di Sarno et al, 36 and D'Angela et al 37 Additional shake-table tests carried out by Berto et al 38 provided experimental evidence that rocking may occur for acceleration lower than the value generally assumed as the rocking limit, which is proportional, by acceleration gravity, to the aspect ratio. A different threshold value of acceleration was proposed to define a safe acceleration limit for seismic vulnerability assessment of freestanding elements.…”

Section: Introductionmentioning

confidence: 90%

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Seismic assessment of free‐standing artifacts: Full‐scale tests on large shake table

Bertó

Sarno

Fragiadakis

et al. 2023

Earthq Engng Struct Dyn

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Recent severe earthquakes highlighted the high vulnerability of artistic assets. Thus, the seismic assessment and formulation of preservation strategies of artifacts are key challenges of modern earthquake engineering, which require theoretical and experimental investigations. The present paper discusses the outcomes from large scale shake table tests carried out on full‐scale free‐standing artifacts. The study is also aimed at evaluating the reliability of existing simplified formulations to predict the rocking motion activation. Emphasis is on prototypes of marble busts with solid and hollow pedestals with different geometries. Comprehensive tests were performed within “Seismic Resilience of Museum Contents” (SEREME) project, which was recently funded by H2020 Framework Programme – Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe (SERA). Uniaxial and biaxial earthquake natural records with different amplitudes and frequency contents were considered to assess the rocking motion of the sample specimens. Response parameters such as uplift, horizontal and vertical accelerations, angular velocity were measured to assess the rocking response of the sample freestanding busts and pedestals. Coefficients of amplification (CAF) of acceleration were also computed. The value of CAF showed that for solid pedestals they were not significantly influenced by peak ground acceleration (PGA) and earthquake type. Conversely, hollow pedestals, which were characterized by larger values of CAF than solid counterparts, ranging between 1 and 7, were affected by PGA and earthquake characteristics. Finally, the outcomes of the presented shake table tests showed that uplifts and angular velocity are effective measures for assessing rocking occurrence of tested artifacts.

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“…2021, 24 and Berto et al. 2018, 35 among others. The outcomes of the present experimental study show that PGV/PGA may lead to rocking initiation.…”

Section: Further Investigations On the Experimental Outcomes For The ...mentioning

confidence: 92%

Section: Introductionmentioning

confidence: 90%

Seismic assessment of free‐standing artifacts: Full‐scale tests on large shake table

Bertó

Sarno

Fragiadakis

et al. 2023

Earthq Engng Struct Dyn

Self Cite

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“…30 Based on the available shaking table test data, four methods for seismic rocking and overturning fragility assessment of freestanding blocks were compared. 31 The experimental overturning fragility curves of three prismatic blocks with different slenderness ratios under bidirectional ground motions were generated. 32 Rocking and overturning fragility of the hospital cabinets and rocking fragility of the inside contents were assessed based on the experimental data.…”

Section: Noveltymentioning

confidence: 99%

“…The geometrical imperfections were found to slightly increase the rocking and overturning probabilities of slender rigid blocks under artificial seismic horizontal bidirectional signals in a narrow range of peak ground acceleration (PGA) 30 . Based on the available shaking table test data, four methods for seismic rocking and overturning fragility assessment of freestanding blocks were compared 31 . The experimental overturning fragility curves of three prismatic blocks with different slenderness ratios under bidirectional ground motions were generated 32 .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on rocking blocks subjected to bidirectional ground and floor motions via shaking table tests

Liu

Zhang

Chen

et al. 2023

Earthq Engng Struct Dyn

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To provide an insight for reliable seismic risk assessment of small building contents, the rocking response of freestanding wooden blocks subjected to 11 bidirectional horizontal ground motion records scaled to various intensity levels is investigated via shaking table tests. Three prisms and three cylinders with slenderness ratios of 2, 3 and 4, and three prisms having the same slenderness ratio of 3 but different size parameters of 158 mm, 237 mm and 316 mm, are considered. The peak ground acceleration statistics corresponding to rocking and overturning of the blocks are obtained. Shaking table tests to investigate the rocking response of the prisms located on different floors of a full-scale three-story reinforced concrete frame structure were also conducted. Experimental fragility curves corresponding to rocking and overturning occurrence of the blocks are finally generated. The experimental results highlight that the minimum rocking accelerations are different for the prisms with the same slenderness ratio but different sizes. Moreover, compared with the prism on the ground, the prism on the top floor has significantly higher rocking demand, while the prism on the second floor may have lower rocking demand. Furthermore, the cylinder has higher rocking and overturning fragility than the prism with the same height and width. The rocking and overturning fragility increases as the block becomes slenderer or smaller. The proposed critical rocking acceleration under bidirectional seismic excitation in real conditions is a half of the theoretical one under unidirectional excitation. K E Y W O R D Sbidirectional ground and floor motions, freestanding blocks, rocking and overturning, seismic fragility, shaking table tests INTRODUCTIONFreestanding slender building contents, such as museum collections, showcases, electrical equipment and hospital devices, usually rock or overturn even during earthquakes of low to moderate intensity levels. The financial or cultural loss due to seismic damage of these contents is often more significant than that of the structural members. It is essential

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“…), passive devices are generally placed at the base. Some researchers investigated the use of double concave curved surface sliders for marble sculptures [7], statues [8,9] and busts [10]. In case of multiple art objects exhibited in museums, others proposed base isolated floors consisting in double friction pendulum isolators that allow protecting more objects with structural optimization and saving of resources [11].…”

Section: Introductionmentioning

confidence: 99%

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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Vulnerability assessment methods for rocking and overturning of free standing elements

Cited by 12 publications

References 17 publications

Seismic assessment of free‐standing artifacts: Full‐scale tests on large shake table

Seismic assessment of free‐standing artifacts: Full‐scale tests on large shake table

Experimental study on rocking blocks subjected to bidirectional ground and floor motions via shaking table tests

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)

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