Recent Development and Application of Seismic Isolation and Energy Dissipation and Conditions for Their Correct Use

Martelli, A.; Clemente, Paolo; Stefano, Alessandro De; Forni, M.; Salvatori, Antonello

doi:10.1007/978-3-319-07118-3_14

Cited by 48 publications

(39 citation statements)

References 10 publications

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“…In view of this, the class of advanced earthquake protection technologies based on the dual concepts of seismic isolation and supplemental damping [4] can offer effective rehabilitation solutions for these special structures too. However, whereas several studies have been dedicated to the seismic isolation of groundsupported tanks, and some actual applications have been recently noticed [5][6][7][8], few references on isolation-based [9,10] or supplemental damping-based [8,11,12] retrofit designs of elevated tanks are found in the literature. Hence, a research programme aimed at extending to this field the use of both types of rehabilitation strategies, deeply enquired by the second and third author for building structures, was recently undertaken.…”

Section: Introductionmentioning

confidence: 99%

Seismic assessment and retrofit of two heritage-listed R/C elevated water storage tanks

Mori

Sorace

Terenzi

2015

Soil Dynamics and Earthquake Engineering

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Section: Introductionmentioning

confidence: 99%

Seismic assessment and retrofit of two heritage-listed R/C elevated water storage tanks

Mori

Sorace

Terenzi

2015

Soil Dynamics and Earthquake Engineering

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“…Application of seismic isolation in civil engineering structures allows reducing considerably seismic loadings in the structural elements [1]. Use of elastomeric isolators in seismic isolation systems is effective owing to high elasticity and damping ability, reliability, low maintenance complexity and durability.…”

Section: Introductionmentioning

confidence: 99%

Studying the standard's requirements for elastomeric seismic isolators by virtual testing

Blostotsky

Efraim

2015

Comp Applic In Engineering

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Modern international standards to end products include a complex of requirements to parameters, materials, performance, and methods of control and acceptance. Development and implementation of standards in practice requires studying of them by a wide range of experts in areas of development of these products, manufacturing techniques, control and acceptance, as well as in areas of their final application. The new standard EH15129 "Antiseismic devices" includes requirements to elastomeric isolators which are widely applied in seismic protection systems of bridges and other civil structures. Requirements to isolators are provided as results of tests in regimes closest to operational. In this paper we propose a method for studying the requirements of the standard by virtual testing of seismic isolators virtual models. At these virtual tests the time-varying actions are reproduced according to the standards requirements (constant, ramp, triangular, and sinusoidal). Virtual models of isolators allow to realize their main properties that affect the test results, such as non-linear elasticity, scragging, damping, creep, and elastic-plastic behavior. For realization of the method, a Simulink environment of MatLab is adopted, allowing to reproduce virtual testing in the form closest to the real tests. The set of virtual models for tests has been created and presented in the form of virtual laboratory which includes library of models of isolators, library of loadings and library of measuring tools. An example of virtual standard tests of commercially available seismic elastomeric isolator is presented in the paper. ß 2015 Wiley Periodicals, Inc. Comput Appl Eng Educ 23:556-566, 2015; View this article online at wileyonlinelibrary.com/journal/cae;

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“…What is more, its effectiveness has also been proven in various countries (USA, Japan, China, Chile, and New Zealand), mainly for structures isolated with rubber bearings, during a considerable number of real earthquakes. [1] In base-isolated structures, a set of isolating units is arranged over an isolation interface, generally located either above the foundation level in buildings or under the deck in bridges, with the aim of providing a reduction of the seismic response of the superstructure by lengthening its fundamental period. The period shift in the response spectrum decreases the accelerations, and hence the internal forces and deformations, but increases the displacements.…”

Section: Introductionmentioning

confidence: 99%

“Total displacement of curved surface sliders under nonseismic and seismic actions: A parametric study”

Quaglini

Gandelli

Dubini

et al. 2017

Struct Control Health Monit

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The re-centring capability is recognized as a fundamental function of any effective isolation system, not only because it is associated to small or negligible deformation at the end of the earthquake but rather because it prevents displacement build up that may limit the capability of the structure to withstand aftershocks and future earthquakes. The current Eurocode recommends to estimate the maximum total displacement of the isolated system as the superposition of the nonseismic offset displacement resulting from permanent actions, long-term deformations and thermal movements of the structure, and of the amplified seismic displacement induced by the design earthquake. For systems endowed with low re-centring capability, the estimation shall also account for the possible accrual of displacements during the lifetime of the structure. However, the aforementioned criteria have never been evaluated for curved surface sliders, which are characterized by an inherent nonlinear behaviour.The study aims at giving more insight into the matter by conducting a parametric study based on one-directional nonlinear response time history analyses and considering a variety of seismic scenarios. The first part of the study investigates the effect of a nonseismic displacement on the earthquake-induced displacement and formulates a criterion to evaluate the capability of curved surface sliders to provide a seismic response independent of the offset displacement. The response of the isolation system to natural sequences of earthquakes, where the offset displacement is the residual displacement from the previous shake, is addressed in the second part of the paper. The provisions of the Eurocode are eventually checked against the observed data.KEYWORDS base isolation, curved surface slider, nonseismic displacement, re-centring capability, total displacement LIST OF NOTATIONS USED IN THE PAPER: d, horizontal displacement of the isolation system; D, horizontal displacement capacity of the isolator in a SDOF system; D i , horizontal displacement capacity of isolator i; d cd , design displacement at the centre of stiffness of the isolation system; d G , non-seismic displacement of the isolator in a SDOF system; d G,i , non-seismic displacement of the isolator i; d m , design seismic displacement of the isolator in a SDOF system; d m,i , design seismic displacement of the i-th isolator; d m,MS , maximum displacement induced by the main shock of a ground motion sequence; d m,o , maximum total displacement under coexisting non-seismic and seismic actions; d o , maximum design non-seismic displacement; d rm , maximum residual displacement; d r , residual displacement of the isolation system with no offset displacement; d r,o , residual displacement of the isolation system affected from the offset displacement d G ; d r,AS , residual displacement at the end of the aftershock of a ground motion sequence; d r,FS , residual displacement at the end of the foreshock of a ground motion sequence; d r,MS , residual displacement at the end of the main s...

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Recent Development and Application of Seismic Isolation and Energy Dissipation and Conditions for Their Correct Use

Cited by 48 publications

References 10 publications

Seismic assessment and retrofit of two heritage-listed R/C elevated water storage tanks

Seismic assessment and retrofit of two heritage-listed R/C elevated water storage tanks

Studying the standard's requirements for elastomeric seismic isolators by virtual testing

“Total displacement of curved surface sliders under nonseismic and seismic actions: A parametric study”

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