scholarly journals Development of Small-Sized Lead Inserted Laminated Rubber Bearing for Nuclear Component Seismic Isolation

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3193
Author(s):  
Gyeong-Hoi Koo ◽  
Jin-Young Jung ◽  
Jin-Hyeong Lee ◽  
Tae-Myung Shin ◽  
Jin-Young Park
Keyword(s):  
Shear Deformation ◽  
Seismic Isolation ◽  
Damping Ratio ◽  
Test Results ◽  
Performance Parameters ◽  
Shape Factors ◽  
Design Specifications ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Nuclear Component

This paper presents a design specification of the small-sized lead inserted laminated rubber bearing (LRB) for application to nuclear component seismic isolation and describes the results of test verification on design performance parameters such as effective horizontal stiffness, equivalent viscous damping ratio, design seismic isolation frequency, and ultimate shear deformation. To do this, two types of LRB, having the same vertical design load of 10 kN but with different shape factors, are designed, fabricated, and tested by the quasi-static procedures. To determine the effective horizontal stiffness and the equivalent damping value from the test results, the new method is proposed and compared with the methods of the ASCE and ISO standards in case that the tangential stiffness curve is not linear in tests. From the comparison between tests and design specifications in the performance parameters, it was found that the design specifications developed in this paper are in a good agreement with the test results. Furthermore, the target design shear deformation limits are confirmed to have sufficient design margins in ultimate shear deformation tests.

Analysis of Vibration Isolator’s Anti-Seismic Performance in Porcelain SF6 High Voltage Circuit Breaker

2013 ◽  
Vol 448-453 ◽  
pp. 2045-2048
Author(s):  
Yan Zhong Ju ◽  
Xin Lei Wu
Keyword(s):  
Seismic Performance ◽  
High Voltage ◽  
Seismic Isolation ◽  
Circuit Breaker ◽  
Isolation System ◽  
High Voltage Circuit Breaker ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Sf6 Circuit Breaker ◽  
Isolation Device

Choosing LW15-550Y porcelain high voltage SF6 circuit breaker as the research subject, we designed the lead laminated rubber bearing (LRB) seismic isolation device for LW15-550Y circuit breaker. We finally gets the results that the LRB isolation system increases the flexibility of the breaker structure and improves the seismic performance of the high voltage circuit breaker structure.

scholarly journals Laminated Rubber Bearing for Seismic Isolation

Kobunshi ◽  
2008 ◽  
Vol 57 (7) ◽  
pp. 523-523 ◽  
Author(s):  
Toshikazu YOSHIZAWA
Keyword(s):  
Seismic Isolation ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing

Experimental Study of FRP Rubber Bearing

2010 ◽  
Vol 168-170 ◽  
pp. 1621-1624 ◽  
Author(s):  
Hua Zhang ◽  
Tian Bo Peng ◽  
Jian Zhong Li ◽  
Wen Xiao Li
Keyword(s):  
Experimental Study ◽  
Shear Modulus ◽  
Damping Ratio ◽  
Compression Modulus ◽  
Damping Capacity ◽  
Fiber Reinforce Polymer ◽  
Damping Property ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Fiber Reinforce

FRP (fiber reinforce polymer) rubber bearing is a novel isolator improved from traditional laminated rubber bearing. Several specimens were manufactured to study the mechanic properties of FRP rubber bearing. Vertical experiments are conducted to study the compression capacity and compression modulus of the bearing and horizontal experiments are conducted to study the shear modulus and damping property of the bearing. Hysteretic curve and damping ratio of each specimen are derived from the experiments. The results show that the performance of FRP rubber bearing matches that of multiplayer rubber bearing but have good damping capacity.

Development of Three Dimensional Seismic Isolation Device With Laminated Rubber Bearing and Rolling Seal Type Air Spring

2002 ◽  
Author(s):  
Junji Suhara ◽  
Tadashi Tamura ◽  
Yasuo Okada ◽  
Katsuhiko Umeki
Keyword(s):  
Seismic Isolation ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Horizontal Load ◽  
3D Seismic ◽  
Air Spring ◽  
Ability Test ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Isolation Device

Three dimensional (3D) seismic isolation device has been developed to use for the base isolation system of the heavy building like a nuclear reactor building. The developed device is the 3D seismic isolation device that consists of the laminated rubber bearing as a horizontal isolation device and the rolling seal type air spring as the vertical isolation device in series. In this research, the 3D seismic isolation device reduction model whose scale is 1/10 is made and the workability of the device by the horizontal and vertical dynamic load is examined. Two experiment parameters are considered. One is the case that the structure of the part that the horizontal load and the vertical load contact is pin condition and the other is the case of the roller condition. As a result of the examination, the workability of the vertical direction is confirmed when the horizontal load acts. The pressure resistant ability test for the air spring is performed by the monotonic pressurization. As the result, it is confirmed that pressure resistant ability improved by restricting the side deformation of the air spring and that the material of the existing air spring can withstand high pressure use sufficiently. As the result, it is confirmed that the developed 3D seismic isolation device is applicable to the actual plant.

Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 11 — Improvement of the Seismic Isolator Design Method

2014 ◽  
Author(s):  
Yuji Aikawa ◽  
Hiroshi Hibino ◽  
Yoshitaka Takeuchi ◽  
Shingo Asahara ◽  
Hideo Hirai ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Seismic Isolation ◽  
Evaluation Method ◽  
Design Method ◽  
Axial Stress ◽  
Seismic Isolator ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Isolation Systems ◽  
Seismic Isolation Systems

This paper provides a part of series of “Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”. This part shows improvements of seismic isolator design method applied to nuclear power facilities. The proposed improvement design methods consist of the following two items. One is an improvement of design method for axial stress in a laminated rubber bearing. Largely different natural frequency in vertical and horizontal direction of the seismic isolator may need a special consideration to combine the design seismic loads in different directions. Therefore isolator’s behavior under multiple direction earthquake is studied, and an improved design method is proposed in the axial stress in a laminated rubber bearing. The other is a reasonable design method for seismic isolator joints. A seismic isolator joint is considered to be one of the key factors for assuring seismic integrity of the seismic isolation system for nuclear power facilities. As a series of design method of seismic isolators, evaluation method of axial force of anchor bolts, among various parts of joints, under design level seismic load is studied and improved method is proposed to confirm the structural behavior for a better performance of the system.

Seismic Response Reduction of the Hybrid Seismic Isolation System Based on the SMA Rubber Bearing Combined with Magneto Rheological Damper

2011 ◽  
Vol 374-377 ◽  
pp. 2543-2547
Author(s):  
Hai Qing Liu ◽  
Yao Feng Yan
Keyword(s):  
Seismic Response ◽  
Shear Deformation ◽  
Mechanical Model ◽  
Seismic Isolation ◽  
Simulation Analysis ◽  
System Simulation ◽  
Great Earthquake ◽  
Isolation System ◽  
Rubber Bearing ◽  
Magneto Rheological

The hybrid seismic isolation system , consisting of the SMA strands-laminate rubber bearing combined with magneto rheological damper ,was explored, for the sake of improving seismic isolation efect of the SMA strands-laminate rubber bearing under great earthquake ，especially when level shear deformation of SMA rubber bearing is bigger(D>0.55d) ．So does its mechanical model. In this paper，we compare the SMA strands-laminate rubber bearing with the hybrid seismic isolation system. Simulation analysis results indicate that the hybrid seismic isolation system is able to achieve both low interstory drift and acceleration and,at the same lime，limit the base displacement．The security of isolated structure was improved largely.

Stability of laminated rubber bearing and its application to seismic isolation

1999 ◽  
Vol 13 (8) ◽  
pp. 595-604 ◽  
Author(s):  
Gyeong-Hoi Koo ◽  
Jae-Han Lee ◽  
Hyeong-Yeon Lee ◽  
Bong Yoo
Keyword(s):  
Seismic Isolation ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing

Restoring Force Characteristics of Laminated Rubber Bearings Under Various Restraining Conditions

2004 ◽  
Vol 126 (1) ◽  
pp. 141-147
Author(s):  
Nobuo Masaki ◽  
Shigenobu Suzuki
Keyword(s):  
Bending Moment ◽  
Combined Loading ◽  
Loading Test ◽  
Restoring Force ◽  
Shape Factors ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Degree Of Restraint ◽  
Rubber Bearings ◽  
Force Characteristics

We conducted the measurement of restoring force characteristics of laminated rubber bearings under various restraining conditions. In the experiment, we provided three laminated rubber bearings with various second shape factors S2=3,4,4.94. The restoring force is obtained by using a newly designed combined loading test apparatus. By using this apparatus, the laminated rubber bearing could be subjected to shear, compressive and rotational deformations independently. In this experiment, we defined the degree of restraint as the ratio of the bending moment to the restricting bending moment which was measured when the rotation angle of the laminated rubber bearing was zero radian. This means that the flanges on both sides of the laminated rubber bearings were kept parallel during horizontal deformations. From the experiment, it was confirmed that restoring force characteristics were affected by the degree of restraint. Some reduction in restoring forces was observed when the degree of restraint was small. In particular the laminated rubber bearing with a small second shape factor, namely the rubber bearing, had a slender shape, easily buckling under small horizontal displacement. It was also confirmed that bending stiffness of the laminated rubber bearing had shear strain dependency and vertical load i.e., surface pressure dependency. The results of this experiment reveal that we should consider the reduction of the restoring force if the upper or lower structure of the laminated rubber bearing is not sufficiently rigid.

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