Assessment of the vertical stiffness of elastomeric bearing due to displacement and rotation

Kazeminezhad, Ehsan; Kazemi, Mohammad Taghi; Mirhosseini, Seyed Mohammad

doi:10.1016/j.ijnonlinmec.2019.103306

Cited by 19 publications

(10 citation statements)

References 11 publications

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“…The node is connected to all the nodes lying on the top end of the plate by multipoint constraints; thus, the end plate is constrained to translate at the horizontal direction as a whole. The vertical and horizontal forces were applied through this node [10]. The boundary condition for EBs is considered as xed at the base (bottom) and at the top is similar to the base, but the lateral and vertical displacements are taken free.…”

Section: Validation and Sensitivity Analysismentioning

confidence: 99%

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WITHDRAWN: Effect of lead core size and arrangement on the shear and axial behavior of the lead rubber bearings

Kazeminezhad

raoufi

2023

Preprint

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Earthquake forces have always been considered as a threat to the structures. One of the most effective ways to have structures with minimal damage and improve their resilience is prevent transmission of earthquake forces to the superstructures. For this purpose, the base isolation method can be implemented. Common types of base isolators are elastomeric rubber bearing and lead rubber bearing. Elastomeric rubber bearing is consisting rubber layers and intermediate steel plates that are produced by vulcanization process and lead rubber bearing (LRB) is similar to the elastomeric rubber bearing but a lead core is located in the center. In this study, shear behavior and vertical stiffness of LRBs are evaluated with the finite element approach. Validation analysis was performed which indicated the accuracy of modeling and then two full scale circle LRBs were selected from Bridgestone corporation with 1000 and 600mm diameters. The main purpose of this paper is evaluating the effect of lead core size, number and location on the shear behavior and vertical stiffness of lead rubber bearings.

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Section: Validation and Sensitivity Analysismentioning

confidence: 99%

“…Jangid and Datta [9] investigated the seismic response of torsionally coupled structures with elastoplastic base isolation. Kazeminezhad et al [10] investigated the vertical stiffness of elastomeric bearings due to the displacement and the rotation. Buckle and Liu [11][12] evaluated the critical load and stability of elastomeric bearings.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Effect of lead core size and arrangement on the shear and axial behavior of the lead rubber bearings

Kazeminezhad

raoufi

2023

Preprint

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“…Sanchez et al [10] were assessment the static and dynamic stability of elastomeric bearing for seismic isolation. In this paper, we will first present the finite element model of the experimentally specimen and then, as a completion of their work, we will evaluate the effect of the rotation on the critical displacement values [13]. The scaled bearing is annular with an outer bonded rubber diameter of 152 mm and an inner diameter of 30 mm.…”

Section: Part III Effect Of Rotation On Critical Displacementmentioning

confidence: 99%

Evaluating the Effect of Support Rotation on the Buckling Modes and Critical Displacement of Elastomeric Base Isolators

Kazeminezhad¹,

Mirhosseini

Kazemi

2020

CTCSE

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“…Rubber has been modeled in FE simulations of SREBs under compression as an incompressible hyperelastic material [24,25] or by assuming a typical value for the bulk modulus of 1000 MPa [26,27] and 2000 MPa. [28][29][30] Other researchers applied more compressibility and followed the recommended values of Poisson's ratio for filled elastomers with a K/G of 200 [31] and 50. [32] Konstantinidis and Rastgoo Moghadam investigated the effect of bulk compressibility (K/G = 1000, 2000, 5000 and 10,000) on the compressive modulus of unbonded infinite-strip and circular pads with different shape factor values (S = 10, 20, 30 and 40) related to frictional restraint (μ between 0.1 and 1.0).…”

Section: Introductionmentioning

confidence: 99%

Influence of rubber compressibility on the compressive stiffness of steel‐reinforced elastomeric bearings in finite element simulations considering the shape factor

Skender

Damjanović

Bartolac

et al. 2022

Polymer Engineering & Sci

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In finite element analysis of steel‐reinforced elastomeric bearings (SREB) under compression, modeling of rubber as a nearly or fully incompressible material requires special attention. In this study, finite element simulations of circular elastomeric pads and rectangular SREB under compression were performed to analyze the effects of rubber compressibility with respect to different pad geometries and shape factor values. The ratio of the compressive modulus for a compressible rubber to that of an incompressible rubber was also introduced based on the previously derived exact solutions as well as the ad hoc approximations. This ratio accurately represents the influence of compressibility on compressive stiffness in terms of relative compressibility (K/G) and shape factor values. Numerical results were also compared with the experimental results on rectangular SREB with moderate shape factors. Recommended values for relative compressibility of carbon black‐filled rubbers in the range of 50–200 result in underestimated compressive stiffness, especially for bearings with shape factor values greater than five. It is recommended to adjust the relative compressibility, considering the shape factor, so that the compressive stiffness does not decrease by more than 50% compared to the incompressible case.

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Assessment of the vertical stiffness of elastomeric bearing due to displacement and rotation

Cited by 19 publications

References 11 publications

WITHDRAWN: Effect of lead core size and arrangement on the shear and axial behavior of the lead rubber bearings

WITHDRAWN: Effect of lead core size and arrangement on the shear and axial behavior of the lead rubber bearings

Evaluating the Effect of Support Rotation on the Buckling Modes and Critical Displacement of Elastomeric Base Isolators

Influence of rubber compressibility on the compressive stiffness of steel‐reinforced elastomeric bearings in finite element simulations considering the shape factor

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