Experimental study on seismic behavior of lead-rubber bearing considering bi-directional horizontal input motions

Kim, Jung Han; Kim, Min Kyu; Choi, In-Kil

doi:10.1016/j.engstruct.2019.109529

Cited by 30 publications

(26 citation statements)

References 4 publications

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“…Ahmadipour and Shahria Alam [4] conducted sensitivity analysis of the mechanical characteristics of lead-core steel reinforced elastomeric bearings under cyclic loading. Kim et al [5] performed experimental study on the seismic behavior of lead-rubber bearing considering bi-directional horizontal input motions, and showed that the failure strain level by 2-D test decreased by 20% in comparison to 1-D test. This theory was later applied by Gent [6] to the problem of stability of multilayered rubber compression springs.…”

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WITHDRAWN: Effect of lead core size and arrangement on the shear and axial behavior of the lead rubber bearings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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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: 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WITHDRAWN: Effect of lead core size and arrangement on the shear and axial behavior of the lead rubber bearings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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“…Here, MRD is the maximum value among the maximum relative displacement of the yand x-directions. The MRD is at least 723 mm and a maximum of 1316 mm when the size of the PGA of the input earthquake is 1.0 g. Kim et al [26] reported that the limit displacement under 2D horizontal input motion was 1120 mm for the lead rubber bearing (LRB) of the NPPs with an external diameter of 1520 mm; the total height of the rubber was 224 mm. Therefore, damage can occur when the size of the PGA is 1 g if the isolation system applied to the nuclear power plant is the LRB.…”

Section: Maximum Stress and Strainmentioning

confidence: 99%

Seismic Fragility Evaluation of Main Steam Piping of Isolated APR1400 NPP Considering the Actual Failure Mode

Jeon

Kim²,

Yun³

et al. 2022

Sustainability

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An isolation system installed in a nuclear power plant (NPP) could increase seismic safety during seismic events. On the other hand, a more significant relative displacement may occur due to the isolation system. The seismic risk could be increased in the case of an interface piping system that connects isolated and nonisolated structures. Therefore, it is necessary to consider the piping systems when evaluating the safety of isolated-NPPs. This study performed seismic fragility analysis with isolated APR1400 nuclear power plants with the main steam piping. The main steam piping is the interface pipe connecting the isolated auxiliary building and the turbine building. The failure mode for seismic fragility analysis was defined as cracks caused by leakage. The experimental and numerical analysis results quantified the leak-through crack point as a damage index. The seismic fragility curves are suggested based on peak ground acceleration and the relative displacement between the isolated and nonisolated buildings.

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“…Lead rubber bearing (LRB) is the most common type of seismic isolation devices used for this purpose. [1][2][3][4] This is mainly attributed to their substantial energy dissipation capabilities, [5][6][7] relatively easy installation, high installation tolerance, and minimal maintenance 8 requirements. LRBs are designed to be flexible enough to allow the structure to move, while also providing enough damping to reduce the amount of seismic energy that is transferred to the structure.…”

Section: Introductionmentioning

confidence: 99%

“…Rubbers show a linear behavior under low-to-moderate shear strains, while they exhibit a hardening effect under high-shear strains. 3,[16][17][18] Rubber hardening and softening unloading effects are observed in LRBs under large shear strains. 19 Based on the observations from past experimental studies, levels of shear strains are classified into the following three categories: strain level below 250% is defined as low shear strain, moderate strain is between 250% and 350%, and above 350% strain level is classified as high shear strain.…”

Section: Introductionmentioning

confidence: 99%

An advanced rate‐dependent analytical model of lead rubber bearing

Aghaeidoost,

Billah

2024

Earthq Engng Struct Dyn

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Lead rubber bearings (LRBs) are a type of isolation bearing that have a combination of rubber and lead as the main components. These bearings are widely used in bridges, buildings, and other important structures due to their high load‐carrying capacity and excellent energy dissipation capability. However, the behavior of LRBs is complex and nonlinear, making it difficult to predict their behavior and performance under different loading conditions. The objective of this research is to develop a comprehensive analytical model of LRBs that can accurately predict their behavior under low to large levels of strain. The proposed model considers nonlinearity, hysteresis, stiffness, damping, and rate‐dependent behavior of LRBs. The model is also able to consider the effect of temperature on the rubber and lead components of the bearing. The developed model is validated using experimental results and is shown to provide accurate predictions of the LRB response under different strain levels. The accuracy of the developed LRB model is also validated using shake table test results of an LRB‐isolated bridge under low and large strain. This research provides a valuable tool for engineers and designers to predict the behavior and performance of LRBs and optimize their design.

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Experimental study on seismic behavior of lead-rubber bearing considering bi-directional horizontal input motions

Cited by 30 publications

References 4 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

Seismic Fragility Evaluation of Main Steam Piping of Isolated APR1400 NPP Considering the Actual Failure Mode

An advanced rate‐dependent analytical model of lead rubber bearing

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