Investigations into the benefits of base isolation for non‐symmetric rigid blocks

Contento, Alessandro; Egidio, Angelo Di

doi:10.1002/eqe.870

Cited by 58 publications

(43 citation statements)

References 8 publications

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“…However, for equation (2.4) to be valid, it is implicitly assumed that the block is slender enough, and the coefficient of friction high enough, to prevent other impact behaviours such as bouncing or sliding (Contento & Di Egidio 2009). In reality, it is clear that the coefficient of restitution is not a function of the geometry solely (see Prieto et al 2004;ElGawady et al 2010 and references therein), and hence equation (2.4) should be considered as a theoretical approximation of the coefficient of restitution needed to sustain pure rocking motion.…”

Section: (B) Treatment Of Impactmentioning

confidence: 99%

Revisiting the rocking block: closed-form solutions and similarity laws

2012

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In this paper, the dynamic response of the rocking block subjected to base excitation is revisited. The goal is to offer new closed-form solutions and original similarity laws that shed light on the fundamental aspects of the rocking block. The focus is on the transient dynamics of the rocking block under finite-duration excitations. An alternative way to describe the response of the rocking block, informative of the behaviour of rocking structures under excitations of different intensity, is offered. In the process, limitations of standard dimensional analysis, related to the orientations of the involved physical quantities, are revealed. The proposed dimensionless and orientationless groups condense the response and offer a lucid depiction of the rocking phenomenon. When expressed in the appropriate dimensionless-orientationless groups, the rocking response becomes perfectly self-similar for slender blocks (within the small rotations range) and practically self-similar for non-slender blocks (larger rotations). Using this formulation, the nonlinear and non-smooth rocking response to pulse-type ground motion can be directly determined, and need only be scaled by the intensity and frequency of the excitation.

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Section: (B) Treatment Of Impactmentioning

confidence: 99%

Revisiting the rocking block: closed-form solutions and similarity laws

2012

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“…This causes severe damages at the BDE and MCE levels, even leading to strength-related (instead of overturning-induced) collapses, especially in artworks made of low tensile strength materials (Borri and Grazini, 2006;Sorace and Terenzi, 2015). An effective alternative installation strategy, increasingly investigated and applied during the last decade, is represented by seismic isolation, either of single objects (Contento and Di Egidio, 2009;Vassiliou and Makris, 2012;Chiozzi et al, 2016) or of groups of artefacts placed on the same floor (Sorace and Terenzi, 2015). The merit of these advanced installation solutions is that a very high protection level is guaranteed to any type of art objects, independently of their specific material, mechanical and geometric characteristics.…”

Section: Observations On Mount Making Strategiesmentioning

confidence: 99%

Modelling of Rocking and Sliding Effects in the Seismic Analysis of a Free-Standing Column

Sorace

Terenzi

Bitossi

et al. 2017

Lat. Am. j. solids struct.

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A study on the seismic response of a free-standing marble column, including rocking and sliding effects, is presented in this paper. The rocking-sliding model implemented for the development of the analyses corresponds to the basic theoretical and numerical simulation of the dynamic phenomenon. The assessment procedure adopted for the application of the model to the non-linear dynamic incremental time-history investigation is checked by comparison with simplified rigid body-based analytical predictions of the rockingonset response acceleration and the overturning critical velocity. The results show a high seismic vulnerability of the column, as identified by severe damage at the basic design earthquake level, and an overturning-related near-collapse response at the maximum considered earthquake level.

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“…The effectiveness of a base isolation system of a slender rigid object on elastomeric isolators depends also on the height-to-width aspect ratio of the superstructure [8][9][10]. Hino et al [10] present the design of a slender rigid object on elastomeric isolators based on: (a) ultimate state of tensile strength of isolators, (b) ultimate state of drift of the base isolation story under seismic loading, (c) ultimate state of the axial compressive stress of isolators under dead loads and (d) the prediction of overturning moment at the base under seismic loading.…”

Section: Special Requirements For Elastomeric Isolatorsmentioning

confidence: 99%

Limit height-to-width aspect ratios for slender base isolated objects of heritage architecture

Petrovčič¹,

Koren²,

Kilar³

2009

WIT Transactions on the Built Environment

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Seismic isolation has become a realistic alternative for decreasing the seismic vulnerability of heritage architecture. This article deals with a special technical aspect of base isolation design of slender rigid objects on elastomeric isolators, by considering the condition that the isolators cannot bear any tensile forces under simultaneous horizontal and vertical ground excitations. The main parameters that govern the response in this case are a) mass, mass position and height-to-width aspect ratios of the superstructure, b) stiffness, damping and plan arrangement of the isolators and c) expected horizontal as well as vertical earthquake acceleration components and their interconnections. The limit height-to-width aspect ratios were obtained for horizontal and vertical accelerations from the Eurocode 8 response spectra, as well as from dynamic analyses of seven near-fault ground motion records. The results are presented as maximum allowable aspect ratios for different vibration periods, ground conditions and design ground accelerations. The inclusion of vertical accelerations in governing equations is extremely important because different horizontal and vertical seismic loading combinations might significantly influence the maximum allowable height-to-width aspect ratios. The article concludes that the results from the response spectrum analysis are conservative. Although, in some ground motion records, the critical combination of horizontal and vertical response accelerations can also produce smaller limit height-towidth aspect ratios.

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Investigations into the benefits of base isolation for non‐symmetric rigid blocks

Cited by 58 publications

References 8 publications

Revisiting the rocking block: closed-form solutions and similarity laws

Revisiting the rocking block: closed-form solutions and similarity laws

Modelling of Rocking and Sliding Effects in the Seismic Analysis of a Free-Standing Column

Limit height-to-width aspect ratios for slender base isolated objects of heritage architecture

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