Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 1—Response Behavior of Test Specimen Under Design Ground Motions

Kitamura, Seiji; Morishita, Masaki; Yabana, Shuichi; Hirata, Ken‐ichi; Umeki, Katsuhiko

doi:10.1115/pvp2009-77614

Cited by 3 publications

References 0 publications

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Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 2—Damage Test of Reinforced Concrete Wall Structure

Inaba

Anabuki

Shirai

et al. 2009

Volume 8: Seismic Engineering

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This paper describes the dynamic damage test of a reinforced concrete (RC) wall structure with seismic isolation sysytem. It has been expected that seismically isolated structures are damaged in sudden when the accelerations of the structures exceed a certain level by hardening of the rubber bearings. However, the response behavior and the damage mode have not been observed by experimental test yet. So, shaking table tests were carried out at “E-Defense”, equipping the world’s largest shaking table, located at Miki City, Hyogo prefecture, Japan. The specimen was composed of an upper structure of 600 ton by weight and six lead-rubber bearings (LRBs) of 505 mm in diameter which provide both stiffness and hysteretic damping. The upper structure consisted of a RC mass and four RC walls with counter weight. The RC wall structure was designed so that the damage of the RC wall occurred between the shear force at the hardening of the rubber bearings and that at their breaking. The dimensions of the RC wall were 1600 × 800 × 100 mm (B × H × t). The reinforcement ratios were 2.46% in vertical by D13 (deformed reinforcing bar, 13 mm in diameter) and 1.0% in horizontal by D10. The shaking table test was conducted consecutively by increasing the levels up to 225% of tentative design earthquake motion. Consequently, because of the increase of the structural response by the hardening of the rubber bearings, the damage of the wall structure with seismic isolation system suddenly happened. In addition, the preliminary finite element analysis simulated the test results fairly well, which were the restoring force characteristics, the crack patterns of the RC wall structure and such.

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Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 2—Damage Test of Reinforced Concrete Wall Structure

Inaba

Anabuki

Shirai

et al. 2009

Volume 8: Seismic Engineering

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Seismic Response of Base-Isolated Structure Including Rupture State of Rubber Bearings

Kanazawa¹,

Yabana²,

Nagata³

et al. 2012

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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For next generation Fast Breeder Reactor (FBR), application of seismic isolation technology to the reactor building is planned to reduce seismic loading to both internal equipment and structures. To grasp seismic behavior of the base-isolated plant to extremely strong quake beyond design ground motion, large-scale shaking table tests are conducted using world largest shaking table �E-Defense� of the National Research Institute for Earth Science and Disaster Prevention. Two sets of one-third scale specimens are tested where the superstructure of 6000 kN weight is supported by six lead rubber bearings (LRBs) of diameter 505 mm. Two or one LRBs are ruptured by the excitation of 4.0 to 4.8 times as large as the presumed design earthquake motion, when the shear strains of the LRBs reached over 550% or more. These ultimate shear strains and the stress-strain curves in the shake test are in good agreement with those of static loading tests using another LRBs made at same time. After these extremely strong excitations, the test specimens behave stably against the seismic inputs of design level even after some of the isolators are ruptured.

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Evaluation on Damage and Residual Performance of Lead Rubber Bearings After the Shaking Table Test

Nagata¹,

Yabana²,

Kanazawa³

et al. 2014

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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This paper presents damage and structural performance of lead rubber bearings which experienced shaking table tests on seismic isolation systems. During the shaking table tests, some of the bearings ruptured due to excessive shear deformation. After the tests, failure surfaces were observed to confirm that these failures started at not bond layers but rubber sheets. Static loading tests were conducted on bearings without rupturing to evaluate structural performance before and after the shaking table tests. Then these bearings were cut in the main loading direction to observe inner damage. In addition, test pieces were made from these bearings to perform shear material tests and peeling tests. It was found that, although inner damages of the rubber and steel were observed around lead plugs, fundamental performance of the bearings was less deteriorated even after the shake table tests.

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Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 1—Response Behavior of Test Specimen Under Design Ground Motions

Cited by 3 publications

References 0 publications

Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 2—Damage Test of Reinforced Concrete Wall Structure

Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 2—Damage Test of Reinforced Concrete Wall Structure

Seismic Response of Base-Isolated Structure Including Rupture State of Rubber Bearings

Evaluation on Damage and Residual Performance of Lead Rubber Bearings After the Shaking Table Test

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