Recycled versus Natural-Rubber Fiber-Reinforced Bearings for Base Isolation: Review of the Experimental Findings

Losanno, Daniele; Calabrese, Andrea; Madera-Sierra, I. E.; Spizzuoco, Mariacristina; Marulanda, Johannio; Thomson, Peter; Serino, Giorgio

doi:10.1080/13632469.2020.1748764

Cited by 53 publications

(28 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to run nonlinear dynamic analysis and develop fragility curves for a large class of buildings, an efficiently accurate numerical modelling strategy must be developed. Recently, Losanno et al (2020) and Calabrese et al (2019) demonstrated that fibre reinforced elastomeric isolators (FREIs) could be a convenient option for base isolation of residential buildings in developing countries. FREIs have been extensively investigated under both preliminary characterization and shaking table tests, demonstrating a good performance in comparison with conventional steel reinforced isolators and thus representing a low-cost technology for NECs (Ravichandran 2020).…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of finite element macro-modelling approaches for seismic analysis of non-engineered masonry constructions

Ravichandran

Losanno

Parisi

2021

Bull Earthquake Eng

View full text Add to dashboard Cite

All around the world, non-engineered masonry constructions (NECs) typically have high vulnerability to seismic ground motion, resulting in heavy damage and severe casualties after earthquakes. Even though a number of computational strategies have been developed for seismic analysis of unreinforced masonry structures, a few studies have focussed on NECs located in developing countries. In this paper, different modelling options for finite element analysis of non-engineered masonry buildings are investigated. The goal of the study was to identify the modelling option with the best trade-off between computational burden and accuracy of results, in view of seismic risk assessment of NECs at regional scale. Based on the experimental behaviour of a single-storey structure representative of Indian non-engineered masonry buildings, the output of seismic response analysis of refined 3D models in ANSYS was compared to that of a simplified model based on 2D, nonlinear, layered shell elements in SAP2000. The numerical-experimental comparison was carried out under incremental static lateral loading, whereas nonlinear time history analysis was performed to investigate the dynamic performance of the case-study structure. Analysis results show that the simplified model can be a computationally efficient modelling option for both nonlinear static and dynamic analyses, particularly in case of force-based approaches for design and assessment of base isolation systems aimed at the large-scale seismic vulnerability mitigation of NECs.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative assessment of finite element macro-modelling approaches for seismic analysis of non-engineered masonry constructions

Ravichandran

Losanno

Parisi

2021

Bull Earthquake Eng

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Each bearing was manufactured by bonding 12 layers of recycled rubber and 11 sheets of quadriaxial carbon-fibre sheets with a polyurethane adhesive. The manufacturing process includes the following simple steps: (i) Impregnation of rubber grains in polyurethane adhesive to form the elastomeric layers, and (ii) superimposing the layers of fibre and recycled rubber with the adhesive and iii) pressing for a certain period at room temperature [34]. The bearings are 63 mm thick, with a plan dimensions of 70 mm × 70 mm.…”

Section: Experimental Behavior Of Rr-frbsmentioning

confidence: 99%

A comparative study of phenomenological hysteretic models with application to recycled rubber-fibre reinforced bearings

Ravichandran¹

2020

J. vibroeng.

View full text Add to dashboard Cite

The present study investigates the capability of different hysteresis models in representing the nonlinear behaviour of Recycled Rubber-Fibre Reinforced Bearings (RR-FRBs). A recently developed class of uniaxial phenomenological models is considered along with the Bouc-Wen Model (BWM). In particular, Bilinear Model (BM) and Exponential Model (EM), belonging to the class of above-mentioned phenomenological models, are used. The restoring force-displacement loops of RR-FRBs obtained from the different models are compared with the experimental studies retrieved from the literature. These first results show that the EM not only can accurately predict the behaviour of RR-FRBs, but it also requires a significantly lower computational time. Furthermore, to investigate the capability of the models in predicting the complete response of base-isolated structures, nonlinear time history analyses are carried out on a base-isolated rigid block with RR-FRBs. The response time histories of the rigid block and the restoring force-displacement loops obtained by using the EM are found to be in close agreement with the results obtained by adopting the BWM. In addition, the EM computational time is only 0.25 % of BWM. This clearly demonstrates the efficiency of EM in the seismic response analyses of base-isolated structures with RR-FRBs.

show abstract

Recycled versus Natural-Rubber Fiber-Reinforced Bearings for Base Isolation: Review of the Experimental Findings

Cited by 53 publications

References 29 publications

Comparative assessment of finite element macro-modelling approaches for seismic analysis of non-engineered masonry constructions

Comparative assessment of finite element macro-modelling approaches for seismic analysis of non-engineered masonry constructions

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

A comparative study of phenomenological hysteretic models with application to recycled rubber-fibre reinforced bearings

Contact Info

Product

Resources

About