Experimental study of laminated rubber bearings for earthquake isolation of buildings. 1st report Static tests for rubber bearings of 490kN rated load.

隆史, 藤田; 聡, 藤田; 重信, 鈴木; 利和, 芳沢

doi:10.1299/kikaic.53.71

Cited by 4 publications

(2 citation statements)

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“…(3) to (5), n», tR and is represent a number of rubber plate, thickness of rubber and steel plate respectively. E b is the elastic modulus for bending of the unit rubber plate, in which both end surfaces are rigidly constrained, with consideration of rubber compression effects (Fujita et a!., 1987). The symbols used in above equations are expressed in Nomenclature.…”

Section: Review Of Stability Equationsmentioning

confidence: 99%

Stability of laminated rubber bearing and its application to seismic isolation

Koo

Lee

et al. 1999

KSME International Journal

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In this paper, the effects of shape factors on the buckling loads in the laminated rubber bearing (LRB) are investigated to guide the design of LRB in determination of the rubber plate thickness and the total rubber height. To substantiate the application of LRB to the seismic isolation of nuclear power plants, the seismic analyses and shaking table tests are carried out for a seismically isolated structure using four LRBs. The parameter equations of seismic isolation frequency are obtained from the shaking table tests and the quasi-static tests of LRB itself to investigate the effects of the LRB characteristics in prediction of maximum peak acceleration responses by analysis. From the comparison of the maximum peak acceleration responses obtained from numerical analyses and experiments, it is verified that the horizontal stiffness variations of LRB should be considered in seismic analysis to get more accurate results.

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Section: Review Of Stability Equationsmentioning

confidence: 99%

Stability of laminated rubber bearing and its application to seismic isolation

Koo

Lee

et al. 1999

KSME International Journal

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“…2021, 11, 4431 2 of 17 developed in many countries for nuclear applications because they can support very heavyweight and are very flexible in shear deformation against horizontal earthquakes. Due to these characteristics, LRBs have been generally developed for seismic isolation of buildings [10][11][12][13][14][15][16]. There are many studies on shaking table tests of LRBs for a building structure seismic isolation, but most of them are performed with the reduced scale LRBs [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Tests of Lead Inserted Small-Sized Laminated Rubber Bearing for Nuclear Component Seismic Isolation

Koo

Shin

2021

Applied Sciences

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To assure seismic isolation performance against design and beyond design basis earthquakes in the nuclear facility components, the lead inserted small-sized laminated rubber bearings (LRB), which has a 10 kN vertical design load, have been designed and quasi-statically tested to validate their design mechanical properties in previous studies. Following this study, the seismic shaking tests of these full-scale LRBs are performed and discussed in this paper with the dummy mass system to investigate actual seismic isolation performance, dynamic characteristics of LRBs, consistency of the LRB’s quality, and so on. To study the seismic isolation performance, three beam structures (S1–S3) with different natural frequencies were installed both on the shaking table and the dummy mass supported by four LRBs: (1) S1: structure close to seismic isolation frequency; (2) S2: structure close to peak input spectral frequency; (3) S3: structure in the high-frequency region. The test results are described in various seismic levels of OBE (Operating Basis Earthquake), SSE (Safe Shutdown Earthquake), and BDBE (Beyond Design Basis Earthquake), and are compared with the analysis results to assure the seismic isolation performance and the LRB’s design parameters. From the results of the shaking table tests, it is confirmed that the lead inserted small-sized LRBs reveal an adequate seismic isolation performance and their dynamic characteristics as intended in the LRB design.

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