Dynamic Lateral Stability of Elastomeric Seismic Isolation Bearings

Vemuru, Venkata S. M.; Nagarajaiah, Satish; Masroor, A.; Mosqueda, Gilberto

doi:10.1061/(asce)st.1943-541x.0000955

Cited by 25 publications

(18 citation statements)

References 17 publications

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“…Similar to fixed‐base buildings constructed of different materials, the failure mechanisms of elastomeric and sliding type isolation systems vary significantly, and thus, the extreme behavior of each system must be studied in its own right. Significant research, both numerical and experimental, has been conducted on the stability of elastomeric bearings at the component level . Fewer tests of full structural systems on elastomeric bearings have been conducted to extreme levels.…”

Section: Introductionmentioning

confidence: 99%

“…Significant research, both numerical and experimental, has been conducted on the stability of elastomeric bearings at the component level. [9][10][11][12][13][14][15][16] Fewer tests of full structural systems on elastomeric bearings have been conducted to extreme levels. Monzon et al 17 tested a curved bridge in which the elastomeric bearings became unstable under excessive displacements; however, due to the unsymmetric geometry of the structure not all bearings exhibited instability, and the seismic inertial force returned the system to zero displacement.…”

Section: Introductionmentioning

confidence: 99%

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Extreme behavior in a triple friction pendulum isolated frame

Becker

Bao

Mahin

2017

Earthq Engng Struct Dyn

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Summary While isolation can provide significantly enhanced performance compared to fixed‐base counter parts in design level or even maximum considered level earthquakes, there is still uncertainty over the performance of isolation systems in extreme events. Researchers have looked at component level stability of rubber bearings and on the effect of moat impact on behavior of structures isolated on general bilinear isolators. However, testing of triple friction pendulum (TFP) sliding bearings has not been done dynamically or incorporated into a building system. Here, one‐third scale laboratory tests were conducted to on a 2‐story 2‐bay TFP‐isolated structure. Input motions were increasingly scaled until failure occurred at the isolation level. As the superstructure was designed with a yield force equivalent to the force of the bearing just at their ultimate displacement capacity, there was minimal yielding. A numerical model is presented to simulate the isolated building up to and including bearing failure. Forces transferred to the superstructure in extreme motions are examined using both experimental and numerical data. Additionally, the effect of the hardening stage of the TFP bearing is evaluated using the numerical model, finding slight benefits.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extreme behavior in a triple friction pendulum isolated frame

Becker

Bao

Mahin

2017

Earthq Engng Struct Dyn

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“…Detailed design procedures of SREIs for seismic isolation of structures along with codal provisions are reported in Naeim and Kelly . R&D works on stability and evaluation of mechanical properties of SREIs subjected to simultaneous action of vertical load and large imposed horizontal displacement attracted attention of researchers in the recent past. In general, SREIs are heavy and relatively expensive.…”

Section: Introductionmentioning

confidence: 99%

“…From review of literature, it has been observed that most of the investigators carried out experimental and numerical studies on scaled models of FREIs with relatively low shape factors. There is little information for isolators with shape factors typical for seismic isolation, specifically 10 to 20 .…”

Section: Introductionmentioning

confidence: 99%

Effect of horizontal loading direction on performance of prototype square unbonded fibre reinforced elastomeric isolator

Ngo

Deb²,

Dutta³

2017

Struct Control Health Monit

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Summary Unbonded fibre reinforced elastomeric isolator (U‐FREI) is lightweight and facilitates easier installation in comparison to conventional steel reinforced elastomeric isolators. Most of the previous studies were focused to investigate the behaviour of scaled models of square U‐FREIs in 0° or 45° horizontal loading directions. However, the angle of incidence of earthquake to a structure may be from any directions. This paper presents influence of different loading directions (0°, 15°, 30°, and 45°) on the horizontal response of a sample prototype square U‐FREI on the basis of both experimental investigation and three‐dimensional finite element analysis. Mechanical properties and deformed configurations of the prototype U‐FREI computed using finite element analyses are observed to be in good agreement with those obtained from experimental study. It is further observed that as the loading direction changes from 0° to 45°, the effective horizontal stiffness of U‐FREI increases, whereas the damping value decreases. Thus, the seismic performance of U‐FREI will also vary depending on the direction of load acting on them.

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“…The authors of this paper (Vemuru et al . ) earlier developed an enhanced analytical model that is capable of modeling the lateral stability of bearings under extreme dynamic loading; however, in the earlier study , the nonlinearity or variation of the bearing vertical behavior beyond stability point and the role played by the vertical reaction in influencing the horizontal behavior is not accounted for, which is the main objective of this study.…”

Section: Introductionmentioning

confidence: 99%

Coupled horizontal–vertical stability of bearings under dynamic loading

Vemuru¹,

Nagarajaiah

Mosqueda

2015

Earthq Engng Struct Dyn

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Summary In this study, the coupled horizontal–vertical behavior of elastomeric bearings subjected to dynamic loading is studied in detail. Under extreme dynamic loading, elastomeric bearings exhibit unstable behavior and an instantaneous loss of horizontal stiffness that is recoverable. Building on an earlier study where the authors developed an analytical model for the horizontal behavior of bearings under dynamic loads, in this study, a new analytical model for the coupled horizontal–vertical behavior of the bearings is developed. The coupled behavior of the bearing is first studied for quasi‐static loading, and later, the behavior of the bearings under dynamic loading is studied. A clear distinction is made between different types of deformation the bearing undergoes in the vertical direction. Based on experimental results, it is observed that the behavior of the bearings under dynamic loading differs markedly from that observed under static loading. A new analytical model is proposed that can account for the coupled horizontal–vertical behavior of the bearings under dynamic loading. The proposed analytical model for predicting the post‐stability vertical behavior of the bearings is verified using experimental results. The model proposed is found to successfully predict the coupled horizontal–vertical behavior of elastomeric bearings. Copyright © 2015 John Wiley & Sons, Ltd.

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Dynamic Lateral Stability of Elastomeric Seismic Isolation Bearings

Cited by 25 publications

References 17 publications

Extreme behavior in a triple friction pendulum isolated frame

Extreme behavior in a triple friction pendulum isolated frame

Effect of horizontal loading direction on performance of prototype square unbonded fibre reinforced elastomeric isolator

Coupled horizontal–vertical stability of bearings under dynamic loading

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