Bidirectional shaking‐table tests of unbonded recycled‐rubber fiber‐reinforced bearings (RR‐FRBs)

Losanno, Daniele; Spizzuoco, Mariacristina; Calabrese, Andrea

doi:10.1002/stc.2386

Cited by 49 publications

(35 citation statements)

References 21 publications

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“…Typically, reinforcing elements are made of thin steel plates [6] in the case of Steel Reinforced Elastomeric Bearings (SREBs) and thin layers of fiber fabric to produce Fiber Reinforced Elastomeric Bearings (FREBs) [27][28][29].…”

Section: Elastomeric Bearingsmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Seismically Base-Isolated Structures by a Novel OpenSees Hysteretic Material Model

et al. 2021

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The complex response characterizing elastomeric isolation bearings is reproduced by employing a novel uniaxial hysteretic model that has been recently formulated and successfully implemented in OpenSees. Such a novel OpenSees material model offers several advantages with respect to differential models typically available in commercial software products for structural analysis, such as 3D-BASIS and CSi programs. Firstly, it is based on a set of only five model parameters that have a clear mechanical significance; such a property not only allows one to drastically simplify the parameters identification process, but it also allows the model to be used in practice. In addition, the model does not require numerical methods for the evaluation of the restoring force since the latter is computed by solving an algebraic equation. To encourage researchers and designers to adopt the proposed model for research and practical purposes, we demonstrate its accuracy by performing some numerical tests in OpenSees. In particular, we first employ the recently implemented model to compute the nonlinear dynamic response of a seismically base-isolated structure with elastomeric bearings and, subsequently, we compare the results with those obtained by modeling the seismic isolators with the OpenSees BoucWen uniaxial material model, that is one of the most popular and accurate hysteretic models currently available in OpenSees.

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Section: Elastomeric Bearingsmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Seismically Base-Isolated Structures by a Novel OpenSees Hysteretic Material Model

et al. 2021

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“…The response of fiber reinforced elastomeric isolators has been studied in several works. Analytical formulations for vertical ( [1,7,8,9]) and horizontal stiffness ( [10,11,12,13]) have been proposed, and a number of other studies have investigated the mechanical properties of bearings through experimental tests ( [4,3,14,15,16,17,18,19,20,21]) and finite element analysis ( [22,23,24,25]). Furthermore, analytical models for static and dynamic response have been proposed ( [26,27,28,29,30]).…”

Section: Simone Galanomentioning

confidence: 99%

On the Vertical Response of Fiber Reinforced Elastomeric Isolators (Freis) Under Combined Vertical and Lateral Loading

Galano¹

2021

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

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The vertical behavior of Fiber Reinforced Elastomeric Isolators (FREIs) is controlled by geometric and mechanical parameters, such as primary and secondary shape factors, shear modulus of the rubber and effective compressive modulus of the rubber-reinforcements compound. Several studies dealt with the vertical properties of the bearings, deriving analytical formulations in function of the bearing geometry and materials' properties. These relations have been derived under pure compression, considering the interaction between single rubber layers and flexible reinforcements. As of today, few works have been proposed on the influence of the horizontal displacement imposed on the bearing, i.e. no interaction between vertical pressure and horizontal displacement on the vertical stiffness and the compressive modulus has been accounted for. In this paper, a numerical study on the influence of the primary and secondary shape factor, the shear modulus of the rubber and the vertical pressure on the vertical properties of the FREIs is presented. In a first stage the behavior of square shaped FREIs under pure compression is examined and relative outcomes are presented. Then the influence of the horizontal displacement on the vertical response of the bearings is considered. Interesting results on the trend of the vertical stiffness and compressive modulus are obtained and useful considerations on the stability of FREIs are provided.

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“…In order to further reduce the cost of FREIs, significant research effort is being dedicated currently to developing a novel elastomeric bearing using recycled rubber. The extremely low cost of recycled-rubber fibre-reinforced elastomeric isolators (RR-FREIs) would make them highly suitable for application in developing nations [9,10,11,12]. However, research on the suitability and effectiveness of the novel RR-FREIs for base isolation of URM buildings is scarce in the literature [13].…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Base Isolation Systems for Unreinforced Masonry Buildings in Developing Countries

Ravichandran¹,

Losanno²,

Parisi³

2021

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

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Unreinforced masonry (URM) buildings are one of the most common constructions in developing countries and are usually constructed based on traditional knowledge without engineering intervention. Due to poor seismic performance of URM buildings, the development of seismic protection systems can play a key role in the mitigation of losses in future earthquakes. Despite the availability of different interventions for seismic strengthening of URM buildings, the quest for a cost-effective technique still exits. On the basis of recent outcomes by these authors, this study presents the design of low-cost base isolation systems for a class of URM buildings deemed representative of the building stock of developing countries. The proposed base-isolation system is made by recycled-rubber fibre-reinforced elastomeric isolators (RR-FREIs). Building classes were defined by properly selecting those parameters which are expected to mostly affect the seismic behaviour of the building such as number of storeys, masonry type and in-plan irregularity. Three-dimensional numerical models of URM buildings were developed in SAP2000 using nonlinear layered shell elements and bilinear models for RR-FREIs. Nonlinear time history analyses were carried out for a set of ground motion records to investigate the performance of both fixed-base (FB) and base-isolated (BI) configurations of URM buildings. The comparison of results shows a significant reduction of inter-storey drift ratios for BI configuration, thus demonstrating the effectiveness of RR-FREIs.

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Bidirectional shaking‐table tests of unbonded recycled‐rubber fiber‐reinforced bearings (RR‐FRBs)

Cited by 49 publications

References 21 publications

Nonlinear Dynamic Analysis of Seismically Base-Isolated Structures by a Novel OpenSees Hysteretic Material Model

Nonlinear Dynamic Analysis of Seismically Base-Isolated Structures by a Novel OpenSees Hysteretic Material Model

On the Vertical Response of Fiber Reinforced Elastomeric Isolators (Freis) Under Combined Vertical and Lateral Loading

Low-Cost Base Isolation Systems for Unreinforced Masonry Buildings in Developing Countries

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