Study on the Response of Elastomeric Bearings With 3d Numerical Simulations and Experimental Validation

Forcellini, Davide; Mitoulis, Stergios A.; Kalfas, Konstantinos N.

doi:10.7712/120117.5441.17186

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…bearings that had significantly greater rotational stiffness than the ones analysed in this paper. It is also underlined that the rotation of the upper support of the steel-reinforced elastomeric bearings is an important loading parameter, which influences the lateral behaviour of the bearing and should be taken into consideration according to research findings (Forcellini et al 2017;Kalfas and Mitoulis 2017;Rastgoo Moghadam and Konstantinidis 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Various studies have also addressed the behaviour of steel-reinforced elastomeric bearings under combined axial loads and shear displacements (Kalfas et al 2017a;Maureira et al 2017;Nagarajaiah and Ferrell 1999;Weisman and Warn 2012). Furthermore, recent studies (Rastgoo Moghadam and Konstantinidis, 2017;Forcellini et al, 2017;Han and Warn, 2015;Ravari et al, 2012;Crowder and Becker, 2017) examined the effect of rotation of the top and bottom of elastomeric bearings, as well as the influence of the combination of the axial loads and shear displacements, on the behaviour of the isolators.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Steel Reinforcement on the Performance of Elastomeric Bearings

2020

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Seismic isolation is an effective measure for mitigating the earthquake hazard on important structures such as hospitals, bridges, and nuclear power plants. Seismically isolated structures should remain essentially elastic for the design earthquake, experiencing minimal or no damage. Steel-reinforced elastomeric bearings are seismic isolation devices that are used extensively for the protection of bridges. Because isolators are critical elements of an isolated bridge, they should experience limited, if any, damage during earthquake shaking that exceeds the design level. Damage associated with yielding of the reinforcing steel shims in seismic isolation elastomeric bearings has received limited attention in the literature. In this context, this paper investigates the effect of the steel reinforcement characteristics on the behaviour of rubber bearings under combined axial load, shear displacement, and rotation. The potential of damage in the steel shims under design shear strains is investigated by utilising a damage factor, Ω, with emphasis being placed on various steel shim thickness values. The investigation is carried out using advanced finite element analysis simulations in ABAQUS/CAE. The research showed that local stresses are developed within the steel shims that exceed the yielding limit of the steel reinforcements. These stresses cause permanent deflections and local damage that alters the properties of the isolators.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Steel Reinforcement on the Performance of Elastomeric Bearings

2020

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Section: Finite Element Model Parametric Analysismentioning

confidence: 99%

“…According to the method proposed in related literature (Buckle and Kelly, 1986;Buckle and Liu, 1993;Nagarajaiah and Ferrell, 1999), we define the point where the shear force passes through a maximum value on the shear force-displacement curve as the critical load, and this point means a neutral equilibrium where the change in total potential energy is equal to 0. As the vertical pressure gradually grows from 2 to 14 MPa, the horizontal stiffness of the bearing significantly reduces at even smaller displacement (Forcellini et al, 2017;. Figure 6 contrasted the effect of rubber layer number and steel shim thickness on the force-displacement response when the vertical pressure is 8 and 14 MPa, and it indicates that when the rubber layer thickness and the rubber layer number are constant, the increase in the steel shim thickness causes a slight increase in the critical load of the bearing under different levels of vertical pressure; for example, for Btr8ts3n30 and Btr8ts8n30 in Table 3, the thickness of steel shim changes from 3 to 8 mm, resulting in a critical load increase of 8.05%.…”

Section: Finite Element Model Parametric Analysismentioning

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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“…In Sheikhi et al [29,30] rubber bearings were coupled with dampers and Radkia et al [31] considered the role of EBs in steel asymmetric structures considering soil-structure interaction. The role of support rotation was object of many contributions [15,[32][33][34][35] and some surveys of the major earthquakes in South America and Asia [36,37] were also proposed. Regarding the support rotation, the European and American design guidelines [38,39] consider a finite support rotation, i.e., small rotation of the anchor plates, or relative rotation.…”

Section: Introductionmentioning

confidence: 99%

3d Numerical Simulations of Multi-Layered Elastomeric Bearings (Eb) Subjected to Combined Vertical and Horizontal Loads

Forcellini,

Kalfas

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Multi-layered elastomeric bearings (EB) have been applied in structural engineering as a mitigation solution for improving the seismic resilience of structural configurations. Such devices have been extensively verified for different loading conditions with laboratory tests and numerical simulations during the last decades. However, their behavior under the mutual effect of axial and shear load is still under assessment. This paper presents the results of 3D numerical simulations of EBs when subjected to large horizontal movements by considering the role of the shear modulus. The paper considers several numerical models of EBs. The main goal is to implement the proposed analytical formulation to numerical platforms that can describe the combined axial -shear macroscopic behavior of the EBs.

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Study on the Response of Elastomeric Bearings With 3d Numerical Simulations and Experimental Validation

Abstract: Abstract. Multi-layer elastomeric bearings are used as common means of isolation with a large number of applications over the last

Cited by 7 publications

References 11 publications

Influence of Steel Reinforcement on the Performance of Elastomeric Bearings

Influence of Steel Reinforcement on the Performance of Elastomeric Bearings

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

3d Numerical Simulations of Multi-Layered Elastomeric Bearings (Eb) Subjected to Combined Vertical and Horizontal Loads

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