Mechanical Property Analysis and Design of Shock Absorber System Using Fiber Bearing by Experimental Method.

Moon, Byung-Young; Kang, Gyung-Ju; Kang, Beom-Soo; Kim, Heung-Seob

doi:10.1299/jsmec.46.289

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…• Hot vulcanization process require for steel reinforcement can be replaced by faster and easier cold vulcanization process used for fiber reinforcements (Moon et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Vertical response of unbonded fiber reinforced elastomeric isolators (U-FREIs) under bidirectional shear loading

Galano

2022

Front. Built Environ.

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Fiber Reinforced Elastomeric Isolators (FREIs) were generally studied in unbonded configuration. Due to combined axial and shear loads, the contact area between the bearing and horizontal supports reduces with the horizontal displacement. As a result, both the vertical and the horizontal stiffnesses decrease with the horizontal deformation while also the vertical deformation increases. This paper presents the results of a large set of full-scale 3D Finite Element Analyses on unbonded fiber reinforced bearings with different geometries, subjected to combined axial and multi-directional shear loads. The main vertical response parameters were studied, namely the vertical displacement, the vertical stiffness, and the effective compressive modulus, thus highlighting the influence of both geometry and horizontal loading direction on the vertical response of the FREIs. Conclusion of this study demonstrate to what extent the combined influence of geometric properties and loading conditions affects the vertical response of elastomeric bearings with flexible reinforcements.

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“…• Hot vulcanization process require for steel reinforcement can be replaced by faster and easier cold vulcanization process used for fiber reinforcements (Moon et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Vertical response of unbonded fiber reinforced elastomeric isolators (U-FREIs) under bidirectional shear loading

Galano

2022

Front. Built Environ.

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“…The use of lead cores in the FREIs of low‐damped rubber is not efficient in increasing the effective damping of isolator 24 . This is due to the negligible in‐plane rigidity of fiber‐reinforcing layers in compression which lack to cause shear deformations in the lead core when the isolator is deformed horizontally.…”

Section: Introductionmentioning

confidence: 99%

On the wind‐induced motion of unbonded fiber‐reinforced elastomeric isolators: Designing for habitability

Chaghakaboodi

Toopchi‐Nezhad

2020

Struct Control Health Monit

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Summary A large number of studies have verified the satisfactory seismic performance of unbonded fiber‐reinforced elastomeric isolators (UFREIs). Typically, the total height of a UFREI will be shorter than its conventional elastomeric isolator counterpart. The shorter height results in a relatively larger isolator initial horizontal stiffness. The relatively large initial stiffness and damping values of UFREIs might be potentially sufficient in many cases to meet the wind serviceability requirements. However, in real practice, this must be examined for any UFREI system. The purpose of this study is to examine the dynamic wind response of a real UFREI system that its satisfactory seismic response was previously verified through shake table tests. The stochastic wind excitations were simulated in the time domain based on the code‐specified basic wind velocity, gust factor, and exposure category using the Cholesky decomposition technique. The root‐mean‐square (RMS) acceleration response of the UFREI system was calculated and then compared with the threshold of human comfort. The cases where the UFREI system could satisfy the wind serviceability requirements were determined. For the cases where the performance was found unsatisfactory, the wind response of the UFREI system was mitigated with the aid of a set of brittle fuses that serve as supplemental springs to increase the initial stiffness of the base isolation system. A simplified procedure is developed for the design of brittle fuses.

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“…For example in Korea a group of researchers associated with Pusan University has studied the manufacturing of the bearings and their use for a shock absorbing system [Moon et al 2003]. In Italy a group of researchers has tested rectangular carbon fiber-reinforced bearings as isolators for liquid storage tanks at refineries and petrochemical facilities [Summers et al 2004].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the run-in effect in fiber-reinforced isolators under vertical load

Kelly

2008

JOMMS

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Previous work on experimental and theoretical studies on fiber-reinforced bearings has shown the feasibility of using them as lightweight low-cost elastomeric isolators for application to housing, schools and other public buildings in highly seismic areas of the developing world. The theoretical analysis covered the mechanical characteristics of these bearings where the reinforcing elements, normally steel plates, are replaced by fiber reinforcement. The fiber in the fiber-reinforced isolator, in contrast to the steel in the conventional isolator (which is assumed to be rigid both in extension and flexure), is assumed to be flexible in extension, but completely without flexural rigidity. This leads to an extension of the theoretical analysis on which the design of steel-reinforced isolators is based that accommodates the stretching of the fiber-reinforcement. Several examples of isolators in the form of long strips were tested at the Earthquake Engineering Research Center Laboratory.The theoretical analysis suggests, and the test results confirmed, that it is possible to produce a fiberreinforced strip isolator that matches the behavior of a steel-reinforced isolator. The fiber-reinforced isolator is significantly lighter and can be made by a much less labor-intensive manufacturing process. The advantage of the strip isolator is that it can be easily used in buildings with masonry walls.The main difference between the behavior of a fiber-reinforced and a steel-reinforced bearing is the degree of run-in under vertical loading. In this context we mean by run-in that a certain amount of vertical load must be applied to the bearing before its vertical stiffness can be developed.The most likely source of the run-in is that the fibers are initially not straight and as they have no bending stiffness, the vertical stiffness cannot be developed until they have been straightened by the action of the applied vertical load. Straightening the fibers requires them to push against the surrounding rubber. This causes an increasing force in the fiber, and as it is straightening, there will be a transition to the stretching of the fiber and to the consequent stiffness of the composite system. These bearings can be used in a wide range of applications in addition to seismic protection of buildings including bridge bearings and vibration isolation bearings, so there is a need to be able to predict how much vertical load or vertical displacement is needed before the full vertical stiffness can be achieved. In this paper a theoretical analysis of the effect has been developed in an attempt to formulate a prediction for the transition from the initially bent to the finally straight fiber.The method takes the already formulated analysis for the straight fiber and modifies it by treating the fiber as a curved string on an elastic foundation, adds to this an estimate of the subgrade reaction of this foundation, and, using the basic equations of the fiber-rubber composite, calculates the effective compression modulus as a function of the ...

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Mechanical Property Analysis and Design of Shock Absorber System Using Fiber Bearing by Experimental Method.

Cited by 5 publications

References 2 publications

Vertical response of unbonded fiber reinforced elastomeric isolators (U-FREIs) under bidirectional shear loading

Vertical response of unbonded fiber reinforced elastomeric isolators (U-FREIs) under bidirectional shear loading

On the wind‐induced motion of unbonded fiber‐reinforced elastomeric isolators: Designing for habitability

Analysis of the run-in effect in fiber-reinforced isolators under vertical load

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