Parametric finite element investigation of the critical load capacity of elastomeric strip bearings

Warn, Gordon P.; Weisman, Jared

doi:10.1016/j.engstruct.2011.07.013

Cited by 31 publications

(8 citation statements)

References 8 publications

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“…However, several papers on stability problems, also very recent (Buckle et al 2002;Warn and Weisman 2011;Weisman and Warn 2012;Sanchez et al 2013;Masroor et al 2012;Han et al 2013), refer to rubber bearings with very low values of both S 1 and S 2 (S 1 = 5.5-10; S 2 = 1.8-2.5), which seem neither realistic nor feasible in actual design solutions; further the importance of S 2 in affecting the stability of the bearings is not specifically addressed: as a matter of fact, the value of S 2 for the tested/analyzed bearings is not explicitly given in the papers and is not accounted for in the interpretation and discussion of the experimental and numerical outcomes.…”

Section: Values Of S 1 and S 2 In Rbs (And Related Research)mentioning

confidence: 99%

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Stability issues and pressure–shear interaction in elastomeric bearings: the primary role of the secondary shape factor

Montuori

Mele

Marrazzo

et al. 2015

Bull Earthquake Eng

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Stability of isolation rubber bearings is a topic widely studied and concerns (1) the critical load capacity in the undeformed configuration, under long-term load (gravity) effects; and (2) the stability condition under short-term vertical pressure (due to gravity plus seismic loads) at large lateral deformations. In this paper the problem of elastomeric bearing stability under large lateral displacements is addressed through FEM parametric analysis; rubber bearings typical of current design practice, characterized by S 1 = 20 are considered, with the value of the secondary shape factor S 2 being varied between 1.5 and 6.2 in order to assess the effect of slenderness on the mechanical behavior, failure mode, and interaction vertical pressure-shear deformation. The analysis results show that the sensitivity of the shear response to the applied vertical pressure is directly related to the value of S 2 and that S 2 has an overwhelming effect on the stability behavior and shear response of the bearing, as compared to the effect of the primary shape factor and of the rubber shear modulus. Finally, S 2 is the parameter which governs the failure mode of the bearing in the seismic condition (vertical pressure-shear deformation). On the basis of these results, design implications are discussed.

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Section: Values Of S 1 and S 2 In Rbs (And Related Research)mentioning

confidence: 99%

“…While the influence of S 1 on the buckling capacity has been recognized and widely studied both experimentally and numerically (Buckle and Liu 1994;Takayama and Morita 2012;Han et al 2013;Sanchez et al 2013;Weisman and Warn 2012;Warn and Weisman 2011), the effect of S 2 has not been comparably explored.…”

Section: Introductionmentioning

confidence: 98%

Stability issues and pressure–shear interaction in elastomeric bearings: the primary role of the secondary shape factor

Montuori

Mele

Marrazzo

et al. 2015

Bull Earthquake Eng

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“…Buckle et al investigated the critical load of elastomeric bearings and Warn et al expressed the relationship between the vertical stiffness and the overlapping area of elastomeric bearings . Warn et al performed parametric finite element analyses, and suggested that the critical load capacity is influenced by not only the overlapping area, but also the shape factor of the bearing and Weisman et al conducted experimental tests and finite element analyses, and showed that the overlapping area method is a conservative estimation . In addition, Ohsaki et al performed finite element analyses for a building frame supported by rubber bearings which showed that the vertical pressure concentrates at the overlapping area .…”

Section: Introductionmentioning

confidence: 99%

Coupling behavior of shear deformation and end rotation of elastomeric seismic isolation bearings

Ishii

Kikuchi

Nishimura

et al. 2016

Earthq Engng Struct Dyn

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Summary This paper presents a mechanical model for predicting the behavior of elastomeric seismic isolation bearings subject to combined end rotations and shear deformation. The mechanical model consists of a series of axial springs at the top, mid‐height and bottom of the bearing to vertically reproduce asymmetric bending moment distribution in the bearings. The model can take into account end rotations of the bearing, and the overall rotational stiffness includes the effect of the variation of vertical load on the bearing and the imposed shear deformation. Static bending tests under various combinations of vertical load and shear deformation were performed to identify the mechanical characteristics of bearings. The test results indicate that bearing rotational stiffness increases with increasing vertical load but decreases with increasing shear deformation. Simulation analyses were conducted to validate the new mechanical model. The results of analyses using the new model show very good agreement with experimental observations. A series of seismic response analyses were performed to demonstrate the dynamic behavior of top‐of‐column isolated structures, a configuration where the end rotations of isolation bearings are typically expected to be larger. The results suggest that the end rotations of elastomeric bearings used in practical top‐of‐column isolated structures do not reduce the stability limit of isolation system. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Ding Lan et al (2017) analysed the mechanical properties of laminated rubber bearings based on transfer matrix method. Warn and Weisman (2011) studied the effect of geometric parameters such as rubber thickness and number of rubber layers on the critical load of elastomeric strip bearings under compression and shear deformation. However, all the above studies of the elastomeric bearing are based on Haringx's equivalent column model while the inner steel shims are assumed as rigid body and uniform in thickness, therefore, the deformation of steel shims and the stress distribution on steel shims are ignored, focusing only on stress and strain on the rubber layer.…”

Section: Introductionmentioning

confidence: 99%

Finite element study of effect of parameters on stress distribution of steel shim in elastomeric bearings

Zhang

2019

Advances in Structural Engineering

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Elastomeric bearings are widely used in various structures as a type of seismic isolation device, and accurately assessing the state of their stress is an essential step in the design of elastomeric bearings. This article aims to better understand the influencing factors of stress distribution on the steel shims and the effect of steel shim thickness on the critical behaviour of elastomeric bearings. First, theoretical analysis is conducted for investigating the influencing factors of the bearing’s critical load capacity and stress distribution on the steel shim thickness. Then, a series of finite element models is employed to study the influence of steel shim thickness on the global performance of bearings, the stress distribution on steel shims at different locations and the effect of steel shim thickness on stress distribution. Combining the results of theoretical analysis and finite element analysis, we conclude that steel shim thickness has little obvious effect on the mechanical properties of the bearing under normal working conditions, but it has a significant influence on the distribution and change of the local stress. Especially, when the vertical load and the horizontal displacement of the bearing increases, the growth rate of stress on the upper steel shims is very fast and may enter the yield state first or even resulting in local damage.

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Parametric finite element investigation of the critical load capacity of elastomeric strip bearings

Cited by 31 publications

References 8 publications

Stability issues and pressure–shear interaction in elastomeric bearings: the primary role of the secondary shape factor

Stability issues and pressure–shear interaction in elastomeric bearings: the primary role of the secondary shape factor

Coupling behavior of shear deformation and end rotation of elastomeric seismic isolation bearings

Finite element study of effect of parameters on stress distribution of steel shim in elastomeric bearings

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