• Title/Summary/Keyword: 표준시방

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A Stud on the Creep Characteristics of Concrete for Reactor Containment Structure (원자로 격납구조 콘크리트의 크리프 특성에 관한 연구)

  • 송하원;정원섭;변근주;송영철
    • Magazine of the Korea Concrete Institute
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    • v.9 no.4
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    • pp.155-165
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    • 1997
  • Since the biggest time-dependent prestress loss of reactor containment structure is due to creep of concrete. the creep is one of important structural factors to be considered for the safety maintenance in the containment structure during design. construction and main enance. This paper is about the creep charactoristies of concrete for the reactor containment structure. In this paper, creep test was performed to show the creep characteristics of reactor containment concrete structure made of the type-V cement. Then, in order to evaluate the applicability of creep prediction equations of recently revised Korean Concrete Standard Specification(KSCE-96) and Japanes Concrete Standard Specification. ACI-209. CEB/FIP-90. and HANSEN, creep test results were compared with prediction results obtained from he equations. From the comparisons, it was shown that the equation of th KSCE-96 predicts creep for younger concrete than 1 year, better than the other equations and that all of the equations predicts creep, for older concrete than 1 year, smaller than test. From regression analysis. a creep prediction equation which effectively predicts creep of concrete due to loading after 1year was proposed.

A Study on the Design & Construction Method of Traditional Landscape Space through the 『Imwongyeongjeji』 「Seomyongji」 and the 'Standard Specification for Repairing Cultural Heritages' (『임원경제지』 「섬용지」와 문화재수리 표준시방서를 통해 본 전통조경공간 설계 시공방법)

  • Lee, Jung-Han
    • Journal of the Korean Institute of Traditional Landscape Architecture
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    • v.37 no.4
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    • pp.1-10
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    • 2019
  • The purpose of this study is to examine the design & construction methods of the traditional landscape space of the past and the repair and maintenance of cultural heritages to maintain it today. To this end, the method of narrative description, process extraction and construction related to traditional landscaping were compared to each other based on the 『Imwongyeongjeji』 「Seomyongji」 and 'Standard Specification for Repairing Cultural Heritages'. The results are as follows; First, to analyze at the description methods of the 『Imwongyeongjeji』 「Seomyongji」 and 'Standard Specification for Repairing Cultural Heritages' and related processes in the field of traditional landscaping. 『Imwongyeongjeji』 「Seomyongji」 was an encyclopedia of the overall construction method of the living space, describing the location, effect, and advantages and disadvantages of each component and presenting quantitative figures to institutionalize the construction of traditional landscaping spaces. 'Standard Specification for Repairing Cultural Heritages' presented the entire process of repairing cultural heritages, and it is becoming a kind of guide for reference at the site. Among them, foundation construction, roof construction, landscape construction, and fence construction were drawn as items that could be applied to traditional landscaping areas. Second, the traditional landscape space construction method was divided into the processes of foundation construction, roof construction, landscaping construction, and fence construction. Foundation construction is a way of repeating the process of land-tramping. During the construction of the roof, the tile-roofed building was built on top of the rafters and roofed with tiles. And thatched roof was made to a number of rice straws bundles to cover the roof one after the other. Instead of tiles, the stone roof was made of thin and wide stones, and the wooden boards were used for the single roof and the bark roof were constructed with many layers of dried corrugations. Landscape construction mainly consists of the Paving technique through tramping rubble and the construction of terraced flower by planting stone, plants, and shrubs on the top. According to the building materials, the wall construction was derived from the earth-stacked earthen wall, stone walls using stone and clay, marble walls made of tile patterns, and the construction of a board wall using a wood board as a wall. Third, comparing the construction methods of the 『Imwongyeongjeji』 「Seomyongji」 and 'Standard Specification for Repairing Cultural Heritages', 『Imwongyeongjeji』 「Seomyongji」 focuses on standardizing the construction methods to create a new traditional space. There is a difference in the setting of the scope of the 『Imwongyeongjeji』 「Seomyongji」 and the construction because 'Standard Specification for Repairing Cultural Heritages' provides the overall construction procedure considering the diversity of the cultural heritages. In addition, the traditional landscape space used to be a residential space in the past, but today, the maintenance process of the already established facilities as designated cultural heritages has been carried out, and construction methods have been added to create viewing conditions. In terms of the succession of traditional knowledge, some similar methods were found in the repair of cultural assets today, and some cases were also confirmed in the reconstruction of traditional technologies such as application of some materials or mix, separation of added facilities and introduction of efficient construction methods.

미국의 21세기 기술기준 정책방향

  • 김남하
    • JOURNAL OF ELECTRICAL WORLD
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    • s.283
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    • pp.44-51
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    • 2000
  • 21세기 세계시장의 도전에 즈음하여 표준개발에 대한 글로벌 기반구조(Infrastructure)가 변화의 계기를 맞고 있다. 하나는 WTO/TBT 협정의 발효로 세계를 대상으로 제품과 시스템을 생산 및 판매하기 위한 표준 및 시방서의 필요성이 커지고 있다는 측면이고 다른 하나는 지구촌 시민이 사용하는 관련제품과 시스템에 대한 보건, 안전 및 환경을 지킬 필요성이다. 모든 표준이 시발점부터 세계를 대상으로 하는 표준시스템으로 개발이 되었다면 문제가 없었을 것이나 대부분의 국가가 자기 나라 차원에서 표준을 개발하였으므로 국제레벨에서 표준문제를 해결하는 일은 아주 복잡하고 어렵다. 이 글은 미국 국립표준기술원(NIST)이 미국의 표준을 세계화하기위한 기반구조 구축의 정책 방향에 관한 내용을 요약한 것이다. 미국은 세계 유일의 초강대국으로 세계시장에 대한 도전, 제작자와 공급자 사이의 상호 연계성, 지구촌 어느 소비자에게 공급된 제품에 대하여도 보건, 안전 및 환경을 지킬 필요성 등을 목표로, 현재의 미국 제도를 21세기 세계표준으로 정착시키겠다는 전략이다.

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