Non-iterative computational model for fiber-reinforced elastomeric isolators

Osgooei, Peyman M.; Tait, Michael J.; Konstantinidis, Dimitrios

doi:10.1016/j.engstruct.2017.01.056

Cited by 20 publications

(9 citation statements)

References 30 publications

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“…Fiber-reinforced EIs (FREIs) are proposed as a less-expensive alternative to SREI, to reduce weight, cost, and manufacturing process time. [2,4,5] FREIs are made of layers of rubber reinforced with fiber sheets (e.g., glass or carbon fibers) which are lighter than steel shims.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce weight further, FREIs can be installed without thick steel plates at the top and the bottom, so they rely essentially on friction from the isolator to the superstructure and foundations. [5] Unbounded FREI specimens reinforced by twisted stands of Kevlar were constructed and tested at the Pacific Earthquake Engineering Research Centre, Berkeley. [4] In unfixed FREIs, the total thickness of the rubber (t r ) is almost equal to the height of the bearing (h), as the total thickness of the fiber sheets is negligible compared with the thickness of the elastomer.…”

Section: Introductionmentioning

confidence: 99%

“…Reducing the weight of EIs would facilitate the manufacturing, shipping, handling, and installation, and would extend the use of this technology to residential and commercial buildings in many parts of the world. Fiber‐reinforced EIs (FREIs) are proposed as a less‐expensive alternative to SREI, to reduce weight, cost, and manufacturing process time . FREIs are made of layers of rubber reinforced with fiber sheets (e.g., glass or carbon fibers) which are lighter than steel shims.…”

Section: Introductionmentioning

confidence: 99%

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Graphene–Rubber Layered Functional Composites for Seismic Isolation of Structures

et al. 2020

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Herein, novel graphene‐reinforced elastomeric isolators (GREI) are proposed. Elastomeric isolators (EIs) are special devices used for seismic isolation of structures. They are made of alternate layers of steel and rubber (steel‐reinforced EI [SREI]), and they position between the structure and its foundations to decouple them. The heavy weight and complex manufacturing process of SREI drives costs up, and this restricts their use to strategic buildings such as hospitals and civic centers. In recent years, alternative materials have been proposed to replace the steel sheets of SREI, e.g., glass or carbon fiber‐reinforced EIs (FREIs). However, their mechanical behavior requires further investigation before being implemented in existing and new structures safely. As a promising alternative, GREI is proposed here to overcome the heavy weight and long manufacturing process of SREI and the mechanical limitation of FREI to seismic excitations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphene–Rubber Layered Functional Composites for Seismic Isolation of Structures

et al. 2020

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“…It was found that the measured roof accelerations, base shear, and total drift in the seismically isolated building were 24–32%, 30–35%, and 28–42% of the corresponding values in the fixed base building, respectively. More recently, Osgooei et al (2015) investigated and compared, via time history analysis, the seismic response of a two-story reinforced concrete shear wall structure, non-isolated and seismically isolated, using U-FREI. Results from these analyses showed that a large reduction can be achieved in base shear, roof acceleration, and roof drift ratio for the seismically isolated building.…”

Section: Introductionmentioning

confidence: 99%

“…As an example, Love et al (2011), Manzooria and Toopchi-Nezhad (2017), and Van Engelen et al (2015) used an extended Bouc-Wen model with the inclusion of a fifth-order polynomial. Subsequently, Osgooei (2015a) proposed a Pivot-Elastic model that comprises the combination of a Pivot hysteresis bilinear model with a nonlinear elastic model. One attractive feature of the model proposed by Osgooei et al (2015a) is that the parameters can be determined from the effective stiffness and damping values, avoiding the need to carry out fitting—for example, using least squares—directly to the hysteresis loops.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Evaluation of a Seismically Isolated Bridge Using Unbonded Fiber-Reinforced Elastomeric Isolators

Al-Anany¹,

Moustafa

Tait³

2018

Earthquake Spectra

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An unbonded fiber-reinforced elastomeric isolator (U-FREI) is a relatively new type of elastomeric bearing that can be implemented as a seismic isolator for bridges. U-FREIs possess beneficial characteristics, including their potentially low-cost and light-weight construction. Individual U-FREIs can be rapidly produced as they can be easily cut from large sheets to the required size and shape, which is an attractive feature for accelerated bridge construction. The objectives of this paper are to introduce a noniterative analytical model to simulate the lateral response of U-FREI, and then to utilize the model to investigate the seismic response of a typical highway bridge isolated using U-FREI and compare it with a traditional non-isolated bridge. The isolated bridge demonstrated a resilient seismic behavior where all the bridge components remained elastic with no damage or residual deformation. The analytical results indicate that the seismic demand of the isolated bridge is reduced by up to 77% and 84% in terms of base shear and accelerations, respectively, as compared with the non-isolated bridge.

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Investigation of seismic fragility curves of unbonded FREIs: Adaptive characteristics and modeling sensitivity

Sheikh,

Ruparathna,

Van Engelen

2024

Earthq Engng Struct Dyn

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Fiber‐reinforced elastomeric isolators (FREIs) are composed of layers of elastomer reinforced with either steel or fibers, and can be placed in a bonded or unbonded configuration between the upper and lower supports. The use of fiber reinforcement in FREIs was intended to reduce the production and installation costs compared to common steel‐reinforced elastomeric isolators (SREIs) and to develop an isolator suitable for widespread application, particularly in developing countries. The unique rollover deformation exhibited by unbonded FREIs (UFREIs), due to their flexible fiber reinforcement, enables them to adapt to multiple performance objectives at different hazard levels. In this study, the impact of different numerical models of UFREIs on the seismic response and failure probability of structures is investigated. The research employs incremental dynamic analysis and the development of fragility curves for different limit states, considering three sets of ground motions (including far‐field and pulse‐like). Moreover, the effect of full rollover was investigated by comparing the fragility curves of UFREIs when supported on modified support geometries, which involved three types of support: unmodified, accelerated, and delayed full rollover. The effectiveness of the adaptive characteristics to behave as a displacement restrain is demonstrated. The results emphasize the importance of employing an accurate model to simulate the behavior of UFREIs as an adaptive device for effectively utilizing their potential capacity, particularly at larger displacements where there is more dissipated energy due to full rollover.

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Non-iterative computational model for fiber-reinforced elastomeric isolators

Cited by 20 publications

References 30 publications

Graphene–Rubber Layered Functional Composites for Seismic Isolation of Structures

Graphene–Rubber Layered Functional Composites for Seismic Isolation of Structures

Modeling and Evaluation of a Seismically Isolated Bridge Using Unbonded Fiber-Reinforced Elastomeric Isolators

Investigation of seismic fragility curves of unbonded FREIs: Adaptive characteristics and modeling sensitivity

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