Modelling the uncertainty in the response of a base isolator

Casciati, Fabio; Hamdaoui, Karim

doi:10.1016/j.probengmech.2007.10.014

Cited by 27 publications

(15 citation statements)

References 12 publications

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“…3-D beam elements are used to model the beams and columns, and 3-D bar elements are used to model the members of the space truss. The SMA isolators are modeled using the link element, which is proposed on the basis of the Bouc-Wen model (Casciati and Hamdaoui, 2008), and its force-deformation relationship is expressed as:…”

Section: Analysis Of the Isolated Structurementioning

confidence: 99%

“…(2007) proposed a new SMA-rolling isolation bearing and conducted a numerical simulation of a torch tower installed with the proposed bearing. Casciati and Hamdaoui (2008) and Casciati et al (2009) proposed an innovative concept of base isolator using Cu-based SMA bars, and its performance was investigated by a numerical study of a highway bridge. Shook et al (2008) introduced SMA wires into a hybrid base isolation system in which the SMA wires exhibited recoverable hysteretic behavior and served as an additional restoring force.…”

Section: Introductionmentioning

confidence: 99%

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A new isolation device using shape memory alloy and its application for long-span structures

Ding

Chen

et al. 2011

Earthq. Eng. Eng. Vib.

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The key points to consider in determining the effectiveness of using structural isolation with shape memory alloys (SMA) are the constitutive model, the SMA isolation device and the analysis method. In this paper, a simplifi ed constitutive model based on the classic theory of plasticity is proposed to simulate the behavior of the superelasticity of the SMA, in which the martensite volume fraction is considered as one of the state variables. Comparisons between simulation results and experimental results are made and indicate that the proposed constitutive model yields stress-strain curves that are in good agreement with the experimental ones. Thus, the proposed model can correctly simulate the yield mechanism and energy dissipation capacity of the SMA. Next, in order to make full use of the superelasticity of SMA, a new SMA isolator composed of pre-tensioned SMA bars is presented. Then, a fi nite element analytical model is established to simulate the behavior of the SMA isolator according to its confi guration and simplifi ed constitutive model. Finally, a simplifi ed design method for long-span structures installed with SMA isolators is proposed, which is further used to investigate the isolation effects of a space grid structure. Results show that the SMA isolator can reduce the seismic responses of the structure effectively, which indicates the effectiveness of the proposed SMA isolation method.

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Section: Analysis Of the Isolated Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new isolation device using shape memory alloy and its application for long-span structures

Ding

Chen

et al. 2011

Earthq. Eng. Eng. Vib.

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show abstract

“…As a result, the numerical response was not consistent with the experimental evidence. The fi rst laboratory tests were carried out as reported in Casciati and Hamdaoui (2007) and some noteworthy observations are as follows:…”

Section: Geometry Of the Devicementioning

confidence: 99%

Performance of a base isolator with shape memory alloy bars

Casciati

Faravelli

Hamdaoui

2007

Earthq. Eng. Eng. Vib.

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A new and innovative base isolation device is introduced in this paper based on extensive research carried out by the authors and their co-workers. A prototype of the device was built and experimentally tested on the shaking table. The new base isolation device consists of two disks, one vertical cylinder with an upper enlargement sustained by three horizontal cantilevers, and at least three inclined shape memory alloy (SMA) bars. The role of the SMA bars is to limit the relative motion between the base and the superstructure, to dissipate energy by their super-elastic constitutive law and to guarantee the re-centring of the device. To verify the expected performance, a prototype was built and tested under sinusoidal waves of displacement of increasing frequency with different amplitudes. It is shown that the main feature of the proposed base isolation device is that for cyclic loading, the super-elastic behavior of the alloy results in wide load-displacement loops, where a large amount of energy is dissipated.

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“…For example, Ariga et al (2006) studied the resonant behavior of base-isolated high-rise buildings in terms of longterm ground motion, and Olsen et al (2008) also investigated long-term building responses. Deb (2004), Dicleli and Buddaram (2007), Casciati and Hamdaoui (2008), Di Egidio and Contento (2010) also have made progress in the study of isolated building systems. Komodromos et al (2007) and Kilar and Koren (2009) focused on seismic behavior and responses through the dynamic analyses of isolated buildings.…”

Section: Introductionmentioning

confidence: 99%

Effects of Isolation Period Difference and Beam-Column Stiffness Ratio on the Dynamic Response of Reinforced Concrete Buildings

Chun¹,

Hur

2015

International Journal of Concrete Structures and Materials

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This study analyzed the isolation effect for a 15-story reinforced concrete (RC) building with regard to changes in the beam-column stiffness ratio and the difference in the vibration period between the superstructure and an isolation layer in order to provide basic data that are needed to devise a framework for the design of isolated RC buildings. First, this analytical study proposes to design RC building frames by securing an isolation period that is at least 2.5 times longer than the natural vibration period of a superstructure and configuring a target isolation period that is 3.0 s or longer. To verify the proposed plan, shaking table tests were conducted on a scaled-down model of 15-story RC building installed with laminated rubber bearings. The experimental results indicate that the tested isolated structure, which complied with the proposed conditions, exhibited an almost constant response distribution, verifying that the behavior of the structure improved in terms of usability. The RC building's response to inter-story drift (which causes structural damage) was reduced by about one-third that of a non-isolated structure, thereby confirming that the safety of such a superstructure can be achieved through the building's improved seismic performance.

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Modelling the uncertainty in the response of a base isolator

Cited by 27 publications

References 12 publications

A new isolation device using shape memory alloy and its application for long-span structures

A new isolation device using shape memory alloy and its application for long-span structures

Performance of a base isolator with shape memory alloy bars

Effects of Isolation Period Difference and Beam-Column Stiffness Ratio on the Dynamic Response of Reinforced Concrete Buildings

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