A SEISMIC DESIGN OF NUCLEAR REACTOR BUILDING STRUCTURES APPLYING SEISMIC ISOLATION SYSTEM IN A HIGH SEISMICITY REGION –A FEASIBILITY CASE STUDY IN JAPAN-

Seismic isolation is a seismic protection technique for buildings which has been recently introduced in Peru. More than twenty seismically isolated buildings exist in Peru, at present. Seismic isolators in many of these buildings have been designed using foreign codes developed for foreign seismic conditions in the absence of local design code. These conditions may not accurately represent Peruvian seismicity. The mandatory use of seismic isolators in new major hospital buildings has been established recently in the Peruvian seismic design code. Available studies in Peru indicate that most health centres may be temporarily affected after a rare seismic event. The seismic isolation Peruvian code is being developed taking into account the needs and implications of Peruvian seismicity. This paper presents the design procedure of the seismic isolation system of a representative four storey reinforced concrete hospital block. The requirements of the draft code for seismic isolation and the current seismic code have been used. The design process and verification show reasonable response of the structure in terms of drifts and acceleration even after including maximum and minimum modification factors of properties for the seismic isolation bearings.

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Seismic Rehabilitation of Existing Reinforced Concrete Buildings with Seismic Isolation: A Case Study

Earthquake Spectra ◽

10.1193/110612eqs323m ◽

2014 ◽

Vol 30 (4) ◽

pp. 1619-1642 ◽

Cited By ~ 7

Author(s):

Donatello Cardone ◽

Giuseppe Gesualdi

Keyword(s):

Seismic Isolation ◽

Residential Building ◽

Existing Buildings ◽

Isolation System ◽

Rehabilitation Process ◽

Seismic Rehabilitation ◽

High Rise ◽

System Type ◽

Displacement Based

The use of seismic isolation for the seismic rehabilitation of existing buildings is very attractive but often very tricky due to several aspects related to its implementation. In this paper, a case study of seismic rehabilitation of a high-rise residential building with seismic isolation is presented. The building under consideration is located in southern Italy and it is placed next to another building from which it is separated by a gap of 400 mm. In the paper, all the steps of the seismic rehabilitation process are described. First, the target objective of the seismic rehabilitation and the choice of isolation system type and location are discussed. The design of the isolation system, carried out following a direct displacement-based approach, is then examined. Finally, the main phases followed in the installation of the isolation system are described. Some comments on costs and time needed to complete the intervention are also reported.

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Influence of Vertical Equivalent Damping Ratio on Seismic Isolation Effectiveness of Nuclear Reactor Building

Energies ◽

10.3390/en14154602 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4602

Author(s):

Xiuyun Zhu ◽

Jianbo Li ◽

Gao Lin ◽

Rong Pan

Keyword(s):

Seismic Response ◽

Seismic Isolation ◽

Nuclear Reactor ◽

Damping Ratio ◽

Response Spectra ◽

Horizontal Displacement ◽

Vertical Displacement ◽

Vertical Acceleration ◽

Equivalent Damping ◽

Reactor Building

This paper aimed at evaluating the influence of different vertical equivalent damping ratios of a 3-dimensional combined isolation bearing (3D-CIB) as regards seismic response and isolation effectiveness. A comparative study of the seismic response in terms of acceleration floor response spectra (FRS), peak acceleration, displacement response of the nuclear reactor building, and dynamic response of the 3D-CIB was carried out. The results showed that: (1) the horizontal FRS is slightly influenced by the vertical equivalent damping ratio of 3D-CIB, whereas the increase of the vertical equivalent damping ratio has a significant effect on reducing the vertical FRS; (2) the peak vertical acceleration increased with the decrease in the vertical equivalent damping ratios of 3D-CIB and the difference of peak accelerations calculated by the damping ratio of 20 and 25% is within 10%; (3) the increase of the vertical equivalent damping ratio is capable of reducing the horizontal displacement and the rocking effect of the superstructure, and effectively controlling the vertical displacement amplitude; and (4) the vertical equivalent damping ratio of 3D-CIB has a slight effect on its axial force. Consequently, it is demonstrated that the increase of the vertical equivalent damping ratio is advantageous for isolation effectiveness. From the view of displacement control, it is suggested that the 3D-CIB with the vertical an equivalent damping ratio of 15~20% is appropriate and acceptable.

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A Study on the Application of EQS bearings for the Seismic Isolation of Building Structures by ICT Case study

Journal of the Earthquake Engineering Society of Korea ◽

10.5000/eesk.2013.17.2.061 ◽

2013 ◽

Vol 17 (2) ◽

pp. 61-70 ◽

Cited By ~ 5

Author(s):

Seong-Mun Yu ◽

You-In Lee ◽

Yong-Soo Ji ◽

Dae-Sung Choi ◽

Doo-Kie Kim

Keyword(s):

Seismic Isolation ◽

Building Structures

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Development of Three-Dimensional Seismic Isolation Technology for Next Generation Nuclear Power Plant Applications

Volume 8: Seismic Engineering ◽

10.1115/pvp2005-71357 ◽

2005 ◽

Cited By ~ 1

Author(s):

K. Takahashi ◽

K. Inoue ◽

M. Morishita ◽

T. Fujita

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Nuclear Power ◽

Seismic Isolation ◽

Base Isolation ◽

Three Dimensional ◽

Scale Model ◽

Isolation System ◽

The Real ◽

Reactor Building

Seismic isolation technology plays an important role in the area of architect engineering, especially in Japan where earthquake comes so often. This technology also makes the nuclear power plant rationalized. The horizontal base isolation with laminated rubber bearings has already been proven its effectiveness. These days, seismic isolation technology is expected to mitigate even the vertical load, which affects the structural design of primary components. Seismic isolation system has possibility to improve the economical situation for the nuclear power plant. From these points of view, a research project has been proceeded to realize practical three dimensional seismic isolation systems from 2000 to 2005 under the sponsorship of the Ministry of Economy, Trade and Industry of the Japanese government. The isolation system is developed for the supposed “Fast Breeder Reactor (abbreviated FBR)” of the next generation. Two types of seismic isolation systems are developed in the R&D project. One is a three-dimensional base isolation for a reactor building (abbreviated 3D SIS) and the other is a vertical isolation for main components with horizontal base isolation of the reactor building (abbreviated V. +2D SIS). At first step of the R&D, requirements and targets of development for the seismic isolation system were identified. Seismic condition for R&D was discussed based on the real seismic response. Vertical natural frequency and damping ratio required to the system were introduced from the response to the seismic movement. As for 3D SIS, several system concepts were proposed to satisfy the requirements and targets. Through discussions and tests on performance, reliability, applicability, maintainability, “Rolling seal type air spring system with hydraulic anti-rocking devices” was decided to be developed. Verification shaking tests with the 1/7 scale model of the system and analysis for applicability to the real plant are conducted. The result shows that the system is able to support the reactor building, to suppress the rocking motion and to mitigate the vertical seismic load. As for V.+2D SIS, coned disk spring device was selected at the beginning of R&D. Performance tests of the elements, which include common deck movement, were conducted and the system applicability to the plant is confirmed. Verification tests were conducted with 1/8 scale model of the system and the result proves the applicability to the real plant.

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Seismic isolation system of two hinged arch suspended-deck bridge: a case study on Kalikuto bridge - Indonesia

E3S Web of Conferences ◽

10.1051/e3sconf/202015605024 ◽

2020 ◽

Vol 156 ◽

pp. 05024

Author(s):

Tri Suryadi ◽

Arvila Delitriana ◽

Zdenek Fukar ◽

Rusri Tjendana

Keyword(s):

Seismic Isolation ◽

Performance Tests ◽

Isolation System ◽

Expansion Joints ◽

Lead Rubber Bearings ◽

Design Requirements ◽

Isolation Systems ◽

Rubber Bearings ◽

Seismic Isolation Systems

Seismic isolation systems are widely used in buildings, bridges, and industrial structures all over the world. The system is known for the efficiency to reduce earthquake demand and thus provide better seismic performance of the structures. In particular to application in an arch suspended-deck bridge, seismic isolation system can be a solution for the seismic resisting system due to the incapability of the cable hangers to transfer horizontal forces from excitation mass on the hanging deck to the main compression arches. Kalikuto arch bridge that is built in 2018 has implemented both Lead Rubber Bearings and Seismic Rubber Expansion Joints as the part of its seismic resisting system. These two seismic isolation devices were designed and engineered accurately to fulfil the seismic design requirements of the Kalikuto bridge. Finally, several performance tests were conducted to evaluate the design compliance of the manufactured devices.

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Performance Evaluation of Seismic Isolation System by Installation Location in Lighthouse Structures

Shock and Vibration ◽

10.1155/2018/5751623 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Moo-Won Hur ◽

Tae-Won Park

Keyword(s):

Performance Evaluation ◽

Seismic Performance ◽

Seismic Design ◽

Seismic Isolation ◽

Isolation Effect ◽

Design Criteria ◽

Seismic Loads ◽

Isolation System ◽

Marine Accidents

The purpose of this study is to evaluate the applicability of seismic isolation devices for marine accidents under seismic loads. The lighthouse structure is a very important facility when the ship approaches the port. However, it is necessary to reinforce the structure to protect it from earthquake. This study presents isolation technology as a method to enhance the seismic performance of lighthouse structures built before seismic design criteria were established. This paper analyzed improvement of seismic performance in three cases of seismic isolation by applying the proposed method of isolation technology. In Case 1, the entire lighthouse structure is isolated, and in Case 2, only the lighthouse lens, the most important component of the lighthouse structure, has been isolated to assure constructability and economy. In Case 3, isolation effect was analyzed by comparing Case 1 and Case 2 with lighthouse structures.

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Nuclear reactor building structures under aircraft impact on the dome shell considering different load—time characteristics

Computational Structural Dynamics ◽

10.1201/9781003078760-3 ◽

2020 ◽

pp. 33-39

Author(s):

F. Stangenberg ◽

R. Zinn

Keyword(s):

Nuclear Reactor ◽

Building Structures ◽

Reactor Building

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Isolation Performance of Intelligent Seismic Isolation System Using Air Bearing

Volume 8: Seismic Engineering ◽

10.1115/pvp2009-77600 ◽

2009 ◽

Cited By ~ 1

Author(s):

Satoshi Fujita ◽

Keisuke Minagawa ◽

Mitsuru Miyazaki ◽

Go Tanaka ◽

Toshio Omi ◽

...

Keyword(s):

Seismic Isolation ◽

Seismic Waves ◽

Three Dimensional ◽

Vertical Motion ◽

Air Bearings ◽

Natural Period ◽

Isolation System ◽

Vertical Excitation ◽

Long Period ◽

Isolation Performance

This paper describes three-dimensional isolation performance of seismic isolation system using air bearings. Long period seismic waves having predominant period of from a few seconds to a few ten seconds have recently been observed in various earthquakes. Also resonances of high-rise buildings and sloshing of petroleum tanks in consequence of long period seismic waves have been reported. Therefore the isolation systems having very long natural period or no natural period are required. In a previous paper [1], we proposed an isolation system having no natural period by using air bearings. Additionally we have already reported an introduction of the system, and have investigated horizontal motion during earthquake in the previous paper. It was confirmed by horizontal vibration experiment and simulation in the previous paper that the proposed system had good performance of isolation. However vertical motion should be investigated, because vertical motion varies horizontal frictional force. Therefore this paper describes investigation regarding vertical motion of the proposed system by experiment. At first, a vertical excitation test of the system is carried out so as to investigate vertical dynamic property. Then a three-dimensional vibration test using seismic waves is carried out so as to investigate performance of isolation against three-dimensional seismic waves.

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Mitigating natural events to avoid disaster in public school buildings: seismic retrofitting of SDN 42 Korong Gadang

MATEC Web of Conferences ◽

10.1051/matecconf/201822902021 ◽

2018 ◽

Vol 229 ◽

pp. 02021

Author(s):

James Mwangi ◽

Laura Putri ◽

Listhbeth Collins

Keyword(s):

School Facilities ◽

Seismic Retrofitting ◽

Building Structures ◽

National Agency ◽

Electrical Grid ◽

The North ◽

Australian Plate ◽

West Sumatra

With over 50 million students, Indonesia has the fourth largest education system in the world. The first twelve years of education are compulsory for all citizens. The students, together with over 3 million teachers spend six (or five in some cases) days a week at over 300,000 schools, typically from 6:30 AM to 2 (or 3) PM. Geographically, Indonesia is traversed by the infamous “ring of fire” and prone to natural events resulting from the tectonic plate movements of the Australian Plate from the South, the Eurasian and Sunda Plates from the North and the Philippine Plate from the East. Left unmitigated, these natural events would lead to natural disasters emanating from resulting earthquakes and leading to tsunamis, landslides, the collapse of building structures and failure of lifelines (roads, pipelines, electrical grid, etc.). In an effort to provide disaster-safe schools, the National Agency for Disaster Management has required that school facilities be a community center in case of disasters and serve as emergency shelters. Retrofit of existing buildings will be needed to comply with government guidelines. This paper presents a case study of the determination of structural deficiencies of an existing school building in SDN 42 Korong Gadang, Padang, West Sumatra and implementation of a seismic retrofit (design and construction) at the same building to mitigate potential earthquake disaster.

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