• 복합신소재구조학회 논문집
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• 제6권1호
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• pp.1-5
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• 2015

This study presents the design and implementation of a structural health monitoring system based on acceleration measurements which used to observe and investigate the structural performance of the administration building in Seoul National University of Education during an earthquake event. The frequency and spectrum are analyzed to assess the building performance during an earthquake shaking which took place on March 31st, 2014. The results indicate that : the vibration of the roof is more clear and dominant during the shaking, and the response of building during earthquake is so small and safe.

• 한국건축시공학회지
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• 제5권4호
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• pp.145-152
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• 2005

Long-term axial shortening of the vertical elements of tail buildings results in differential movements between two elements and may lead to the additional moments of connection beam and slab elements, and other secondary effects, such as cracks of partitions or curtain walls. Accurate prediction of time-dependent column shortening is essential for tall buildings from both strength and serviceability aspects. The compensation method is different from reinforced concrete and SRC(Steel Reinforced Concrete) members. The SRC columns are usually compensated according to total differential shortening between two vertical elements. In this study, column shortenings of 37-story W building under construction are predicted and compensated. The SRC column shortenings are compared with the actual column shortening by field measurement and the column shortenings are reanalysed and recompensated.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.312-319
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• 2004

This paper is mai y focused to develop new concrete material model such as ultimate failure surface in compression-compression region, hardening rule and cracking criteria which are basically used in the nonlinear finite element analysis of nuclear prestressed concrete containment building. From the Kepri's experimental results, failure surface of the concrete based on the elasto-plastic material model is modified and new cracking criteria is proposed. Nonlinear FE analysis program using a new material model is implemented to analysis plane concrete. Finally, numerical simulation to compare the performance of the new material model with experimental results is employed. The numerical results by the proposed model in this study agree very well with the experimental data.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.639-646
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• 2006

A nonlinear finite element analysis is carried out to predict the ultimate internal pressure and failure mechanism of a 1/4 scale prestressed concrete containment vessel(PCCV) model using the commercial code ABAQUS. Therefore, this paper is mainly focused to compare the influence of concrete material model, tension stiffening parameter, uplift phenomenon and basemat. From the analysis results, nonlinear behavior of the PCCV showed a substantially different aspects in accordance with the nonlinear material model for the concrete as well as tension stiffening parameter. The boundary conditions beneath the basemat are considered to be a fixed condition and a nonlinear spring element to compare the influence of the uplift. The finite element analysis is considered with and without a basemat to find out the influence of the basemant itself. From the analysis results, the nonlinear behavior of the PCCV is entirely similar for the two cases.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.496-499
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• 2006

In this study, a practical method of shrinkage stress analysis on concrete slab in multi-story building is proposed, which considers both internal restraint and external restraint variation resulting from construction sequence. The shrinkage stress due to external restraint is obtained by multiplying relaxation coefficient to elastic shrinkage stress. The additional shrinkage stress due to internal restraint is obtained by residual strain of the elastic analysis. A verification example was analyzed and compared by the proposed method and commercial analysis program that is capable of time-dependent analysis of concrete. The results of 10-story example building show that the internal restraint of reinforcement increases the shrinkage stress considerably at the slabs under loose external restraint.

• 전기의세계
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• 제22권2호
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• pp.75-86
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• 1973

본 연구에서는 전기온돌의 안방열손실을 감소시키고 축열효과를 향상시키기 위한 방법을 검토하였으며 전기온돌에서 발생하는 진동소음을 감살시킬 수 있는 대책을 제시하였다. 저육들은 6.6[m$^{2}$] 크기의 전기온돌 model을 이용하여 건물의 구조차이와 하향열단열층의 설치유무에 따른 보온특성의 차이를 기록분석하였으며 그 결과 열전도계수가 0.03[kcal/m.hr.deg. C]정도인 내열성 Styropol과 지석 Mortar로 구성된 하향열단열층을 전기온돌의 마닥에 설치할 경우 난방부하의 감소로 인하여 축열효율이 약 2배나 향상된다는 결론을 얻었다. 또한 전기온돌공사시에 발열선을 지지할 수 있는 대각선형 Spacer를 설치하고 발열선이 매설콘크리트가 완전히 양생된 이후에 전력을 인가하면 흔히 전기온돌에서 발생하는 120-960[Hz]의 가청진동소음을 방지할 수 있다는 사실을 실험적으로 확인하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.49.2-53
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• 2003

This paper reports the application of high strength concrete designed as 800kg/$cm^2$ on the columns and belt wall of Tower Palace III. The concrete should meet or exceed the requirements of slump of 23cm, ${\sigma}$18H of 100kg/$cm^2$, ${\sigma}$91th of 800kg/$cm^2$. The concrete mixings with 4 different domestic Silica fumes were investigated. Laboratory tests, the pilot productions of batcher plant and the full-scale mock up tests were performed As results of site application, all test results are satisfied with the requirements of columns and belt wall.

• 한국농공학회지
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• 제42권3호
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• pp.114-120
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• 2000

In this study a computer program considering initial imperfection of wall of axisymmetric reinforced concrete shell which show plastic deformation by large external loading is developed. initial imperfection of wall of axisymmetric reinforced concrete shell is assumed as sinusoidal curve expressed as {{{{ {W }_{i } }}}}={{{{ {W}_{0 } }}}}sin (n$\pi$y/$\ell$)y. The developed program is applied to the analysis of the dynamic response of axisymmetric reinforced concrete shell when the wall has initial imperfection. The initial imperfection of 0.0 -5.0, and 5cm and steel ratio 0.3, and 5% are tested for numerical examples. The effects of the wall initial imperfection and steel ratio on the dynamic response of the axisymmetric reinforced concrete shell are analysed, It is shown that the direction of the initial imperfection is very important factors for determining the dynamic response.

• 한국산업안전학회:학술대회논문집
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• 한국안전학회 2001년도 공동학술대회
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• pp.191-196
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• 2001

국내 경제성장이 증대함에 따라 철근콘크리트 건축구조물은 다양화, 복잡화, 고층화 되고 있으며 이로 인한 사업의 무리한 추진으로 부실시공 등으로 국내에서는 1970년 4월 서울마포의 와우아파트 붕괴사고, 1995년 6월 삼풍붕괴 사고 등 크고 작은 사건 및 사고로 인한 막대한 재산과 고귀한 생명의 손실 등이 사회적인 문제로 대두되면서 건축물의 유지관리 및 안전진단 등에 대한 중요성이 부각되기 시작했다. 이렇게 크고 작은 사고들이 많이 발생함에 따라 기술인 들이 피땀 흘려 건설된 공공시설을 불신하게 되면서 건설공사중인 현장과 사용중인 시설물에 대해서 법으로 규제사항을 강화하거나 새로운 내용이 신설되고 있는 실정이며 전국 중요 시설물에 대한 유지 관리 업의 중요성이 대두되고 있는 실정이다.(중략)

• 한국공간구조학회논문집
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• 제3권1호
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• pp.47-55
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• 2003

This paper is concerned with the dynamic characteristics of buildings, especially with the measurement of the natural frequencies(natural periods) and the damping. Process of ambient vibration and synchronized human excitation tests for natural period and damping are given. Data from measurement on 16 reinforced concrete buildings in Seoul and Seoul national university of technology are given. 16 Low-rise Reinforced concrete buildings are measured for ambient vibration to obtain the vibrations characteristics. The natural periods obtained by ambient vibration measurements are compared with those of forecast model suggested by standards and foreign researchers. The natural periods show a clear dependence on building height. On the other hand, the damping ration scatter under the influence of various factors, for example, building height and natural frequency.