• Title/Summary/Keyword: Seismic safety

Search Result 1,012, Processing Time 0.025 seconds

A Discussion on the Improvement of Seismic Design Criteria of Infrastructures (사회기반시설물의 내진설계기준 개선방향에 대한 고찰)

  • Seo, Hyeong Yeol;Park, Kwang Soon;Kim, Ick Hyun;Kim, Dong Soo
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.18 no.5
    • /
    • pp.231-240
    • /
    • 2014
  • This study reviews the status and validity of seismic design criteria (SDC) for major facilities in Korea, which are composed of performance criteria and technical standard. Various facilities with different seismic design response spectra are analyzed to identify their seismic performance and necessity of eventual retrofit. The results are used to derive improvement directions of SDC. It is also concluded that the technical standard should be improved after the revision of the performance criteria.

The present state of earthquake hazard for the apartment structures in Korea (국내 공동주택의 지진위험도 현황에 관한 연구)

  • Kim, Hyeon-Jin;Park, Tae-Won;Jeong, Ran
    • Journal of the Korea Construction Safety Engineering Association
    • /
    • s.49
    • /
    • pp.92-102
    • /
    • 2009
  • Earthquake is one of the hazard so hard because it is difficult predicted occurred time, scale and characters. Due to a recent Sichuan earthquake in China with a magnitude of 7.8, it is worried about having a major earthquake in Korea peninsula in near future. The earthquake in Kobe, Japan showed that the damages were concentrated on the buildings which were not considered to be protected from the earthquakes. In this study, apartment structures in Korea analyze about earthquake hazard and evaluate seismic performance. Through the this study we have notice of earthquake hazard for apartment structures which live a lot of population of Korea and suppose necessary for seismic retrofit.

  • PDF

Seismic Qualification Test on Motor Control Center for Use in Nuclear Power Plants (원자력발전소용 Motor Control Center의 내진검증시험)

  • 김병현
    • Proceedings of the Earthquake Engineering Society of Korea Conference
    • /
    • 1997.04a
    • /
    • pp.217-224
    • /
    • 1997
  • The safety related equipments for use in nuclear power plants should be subjected to the seismic qualification in order to insure the safety of the nuclear power plant. This paper summarizes the seismic qualification test on the Low Voltage Motor Control Centers(MCC's) for use in Wolsong Nuclear Power Plants, Units 2, 3 and 4. The seismic qualification test was performed on the two prototype MCC's(a two-bay wide unit for Phase #1 Test and a five-bay wide unit for Phase #2 Test). The specimens were electrically powered and monitored during the test process. It was demonstrated that the specimens possessed sufficient structural and electrical integrity to withstand the required seismic conditions.

  • PDF

The Present State of Earthquake Hazard for the Apartment Structures in Korea (국내 공동주택의 지진위험도 현황에 관한 연구)

  • Kim, Hyeon-Jin;Park, Tae-Won;Chung, Lan
    • Journal of the Korean Society of Safety
    • /
    • v.23 no.6
    • /
    • pp.100-107
    • /
    • 2008
  • Earthquake is one of the hazard so hard because it is difficult predicted occurred time, scale and characters. Due to a recent Sichuan earthquake in China with a magnitude of 7.8, it is worried about having a major earthquake in Korea peninsula in near future. The earthquake in Kobe, Japan showed that the damages were concentrated on the buildings which were not considered to be protected from the earthquakes. In this study, apartment structures in Korea analyze about earthquake hazard and evaluate seismic performance. Through the this study we have notice of earthquake hazard for apartment structures which live a lot of population of Korea and suppose necessary for seismic retrofit.

A Test Verified Model Development Study for Seismic Qualification(Safety) (내진검증(안전)을 위한 실험적 고찰을 이용한 해석 모델 개발연구)

  • Uk-Hwan Sur
    • Journal of the Korean Society of Safety
    • /
    • v.13 no.4
    • /
    • pp.286-291
    • /
    • 1998
  • This paper includes discussion on developing the test verified finite element model for one of the seismic qualification(safety) approaches. It presents a test verified finite element model of a UPS(Uninterruptible Power Supply System) to be used at KMRR, KAERI. The test verified model predicts natural frequencies within 5 percent error for all major modes below 50Hz. This model accurately represents the dynamic characteristics of the actual hardware and is qualified for its use in the final stress analysis for seismic verification.

  • PDF

Study on Seismic Response Characteristics of Reactor Vessel Internals and Fuel Assembly for OBE Elimination

  • M. J. Jhung;Y. G. Yune;Lee, J. H.;Lee, J. B.
    • Nuclear Engineering and Technology
    • /
    • v.29 no.5
    • /
    • pp.417-431
    • /
    • 1997
  • To resolve a general argument about OBE elimination for the future nuclear power plant design, seismic responses of reactor vessel internals and fuel assembly for Ulchin nuclear power plant units 3 and 4 in Korea are investigated as an example. Dynamic analyses of the coupled internals and core are performed for the seismic excitations using the reactor vessel motions. By investigating the response relations between OBE and SSE and their response characteristics, the critical components for OBE loading are addressed. Also the fuel assembly responses are calculated using the core plate motions and their behavior is found to be insignificant for OBE elimination.

  • PDF

Seismic Response Control of Bridge Structure using Fuzzy-based Semi-active Magneto-rheological Dampers

  • Park, Kwan-Soon;Ok, Seung-Yong;Seo, Chung-Won
    • International Journal of Safety
    • /
    • v.10 no.1
    • /
    • pp.22-31
    • /
    • 2011
  • Seismic response control method of the bridge structures with semi-active control device, i.e., magneto-rheological (MR) damper, is studied in this paper. Design of various kinds of clipped optimal controller and fuzzy controller are suggested as a semi-active control algorithm. For determining the control force of MR damper, clipped optimal control method adopts bi-state approach, but the fuzzy control method continuously quantifies input currents through fuzzy inference mechanism to finely modulate the damper force. To investigate the performances of the suggested control techniques, numerical simulations of a multi-span continuous bridge system subjected to various earthquakes are performed, and their performances are compared with each other. From the comparison of results, it is shown that the fuzzy control system can provide well-balanced control force between girder and pier in the view point of structural safety and stability and be quite effective in reducing both girder and pier displacements over the existing control method.

  • PDF

Earthquake safety assessment of an arch dam using an anisotropic damage model for mass concrete

  • Xue, Xinhua;Yang, Xingguo
    • Computers and Concrete
    • /
    • v.13 no.5
    • /
    • pp.633-648
    • /
    • 2014
  • The seismic safety of concrete dams is one of the important problems in the engineering due to the vast socio-economic disasters which may be caused by collapse of these infrastructures. The accuracy of the risk evaluation associated with these existing dams as well as the efficient design of future dams is highly dependent on a proper understanding of their behaviour due to earthquakes. This paper develops an anisotropic damage model for arch dam under strong earthquakes. The modified Drucker-Prager criterion is adopted as the failure criteria of the dynamic damage evolution of concrete. Some process fields and other necessary information for the safety evaluation are obtained. The numerical results show that the seismic behaviour of concrete dams can be satisfactorily predicted.

Development of classification criteria for non-reactor nuclear facilities in Korea

  • Dong-Jin Kim;Byung-Sik Lee
    • Nuclear Engineering and Technology
    • /
    • v.55 no.2
    • /
    • pp.792-799
    • /
    • 2023
  • Non-reactor nuclear facilities are increasing remarkably in Korea combined with advanced technologies such as life and space engineering, and the diversification of the nuclear industry. However, the absence of a basic classification guideline related to the design of non-reactor nuclear facilities has created confusion whenever related projects are carried out. In this paper, related domestic and international technical guidelines are reviewed to present the classification criteria of non-reactor nuclear facilities in Korea. Based on these criteria, the classification of structures, systems and components (SSCs) for safety controls is presented. Using the presented classification criteria, classification of a hot cell facility, a representative non-reactor nuclear facility, was performed. As a result of the classification, the hot cell facility is classified as the hazard category 3, accordingly, the safety class was classified as non-nuclear safety, the seismic category as non-seismic (RW-IIb), and the quality class as manufacturers' standards (S).