Study on Three-Dimensional Seismic Isolation System for Next Generation Nuclear Power Plant: Independent Cable Reinforced Rolling-Seal Air Spring

Kageyama, Mitsuru; Hino, Yoshihiko; Moro, Satoshi

doi:10.1115/pvp2004-2933

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…The rolling seal type air spring is a steel/concrete cylinder lowered into an air cavity and attached with a rolling rubber seal, and is configured in series with a laminated rubber bearing for horizontal isolation [101,102]. The cable reinforced air spring consists of an inner cylinder attached to the base and an outer cylinder attached to the structure separated by an air cavity bounded by a flexible rubber sheet [103,104]. The distance between the cylinders allows the device to move both horizontally and vertically and thus accommodate horizontal and vertical motion.…”

Section: Development and Testing Of 3-dimensional Isolation Systemsmentioning

confidence: 99%

A Review of Seismic Isolation for Buildings: Historical Development and Research Needs

2012

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Seismic isolation is a technique that has been used around the world to protect building structures, nonstructural components and content from the damaging effects of earthquake ground shaking. This paper summarizes current practices, describes widely used seismic isolation hardware, chronicles the history and development of modern seismic isolation through shake table testing of isolated buildings, and reviews past efforts to achieve three-dimensional seismic isolation. The review of current practices and past research are synthesized with recent developments from full-scale shake table testing to highlight areas where research is needed to achieve full seismic damage protection of buildings. The emphasis of this paper is on the application of passive seismic isolation for buildings primarily as practiced in the United States, though systems used in other countries will be discussed.

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Section: Development and Testing Of 3-dimensional Isolation Systemsmentioning

confidence: 99%

A Review of Seismic Isolation for Buildings: Historical Development and Research Needs

2012

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“…After 2000, Japanese scholars proposed a variety of 3D isolation bearings suitable for use in nuclear power structures. The horizontal isolation device consisted of either flat rolling bearings or elastomeric bearings, and the vertical isolation device consisted of coil and air springs together with viscous dampers, etc 20–22 . This 3D isolation bearing is very large in size 23 and exceptionally complex as it utilizes air springs, accumulators, piping, valves, active components, and leveling systems that require continued maintenance.…”

Section: Introductionmentioning

confidence: 99%

Shaking table tests on the seismic response of truss structure with air spring‐FPS three‐dimensional isolation bearing

Han,

Jing,

2023

Earthq Engng Struct Dyn

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To investigate the isolation effect of the friction pendulum system (FPS) horizontal isolation bearing and the air spring‐FPS three‐dimensional (3D) isolation bearing in truss structure and the influences of long‐period ground motions on the isolated structure, the shaking table test of a truss structure is designed and conducted. The ordinary ground motions, near‐fault pulse‐like ground motions, and far‐field long‐period ground motions with different spectral characteristics are chosen to input into the structure, and the dynamic characteristics such as the acceleration, displacement, and stress of the truss are compared and analyzed. The horizontal frequency of the horizontal isolated structure is reduced after the horizontal isolation, while the vertical frequency is further reduced after 3D isolation. The isolation effect of nodal acceleration, nodal displacement, and member stress under 3D isolation is better than that of horizontal isolation, especially the vertical seismic response is significantly improved. When the ground motion intensity is small, the FPS horizontal isolation bearing slides little, and reducing the seismic response of the structure is limited. There is a better isolation effect of 3D isolated structure. The vertical frequency ratio Rf under ordinary ground motions is far away from 1 and close to 3, basically avoiding the main energy segment of the ground motions. The advantage of 3D isolated structure is relatively reduced under long‐period ground motions, which lies in the rich low‐frequency components of long‐period ground motions which are difficult to isolate effectively.

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“…Kashiwazaki et al developed and tested a hydraulic system consisting of load‐carrying hydraulic cylinders filled with nitrogen gas for vertical isolation, also connected in series with laminated rubber bearings. Kageyama et al proposed a 3D isolation system consisting of cable reinforced air springs. The 3D air spring was composed of an inner cylinder attached to the base and an outer cylinder attached to the structure separated by an air cavity bounded by a flexible rubber sheet.…”

Section: Introductionmentioning

confidence: 99%

Displacement/velocity‐based control of a liquid spring—MR damper for vertical isolation

Eltahawy

Ryan

Çeşmeci

et al. 2019

Struct Control Health Monit

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Seismic isolation is an effective technique used to mitigate effects of shaking and helps to achieve higher seismic performance. Recent researches have suggested that vertical excitation has significant effects on structures behavior during earthquake. In this study, three-dimensional (3D) isolation is proposed that combines an elastomeric bearing to resist horizontal ground shaking in series with a bilinear liquid spring (BLS)-controllable magnetorheological fluid damper (CMRD) to resist vertical shaking. A numerical model of a simplified rigid 2D block was developed to predict BLS-CMRD response under earthquake loading. The response of the BLS-CMRDs was simulated through a combination of nonlinear stiffness and viscous and hysteretic (semi-active) damping. A Disp/Vel-based control strategy was proposed that adjusts the input current according to the instantaneous vector combination of feedback displacement and velocity of the damper. Two variations of the control strategy were explored. First, with linear current variation, the current is activated when a threshold lower bound vector magnitude is reached, and maximum current is applied when threshold upper bound magnitude is exceeded. Second, the simplified ON-OFF strategy uses single threshold vector magnitude that triggers the maximum current to turn on when the instantaneous vector magnitude exceeds the threshold, and turn off otherwise. Results show that for ground motions that exceed the design level, Disp/Vel-based Control is effective to moderate the level of energy dissipation, keep the device vertical displacement within the design stroke limit, and attenuate vertical acceleration below PGA. In addition, Disp/Vel-based control reduces all responses relative to the well-known clipped optimal strategy used for structural control.

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Study on Three-Dimensional Seismic Isolation System for Next Generation Nuclear Power Plant: Independent Cable Reinforced Rolling-Seal Air Spring

Cited by 8 publications

References 1 publication

A Review of Seismic Isolation for Buildings: Historical Development and Research Needs

A Review of Seismic Isolation for Buildings: Historical Development and Research Needs

Shaking table tests on the seismic response of truss structure with air spring‐FPS three‐dimensional isolation bearing

Displacement/velocity‐based control of a liquid spring—MR damper for vertical isolation

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