• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.145-146
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• 2010

A moment redistribution method was developed for earthquake design of reinforced concrete moment-resisting frames. For a frame designed with strong column-weak beam, the moment redistribution mechanism was investigated. Based on the result, the relationship between redistributed moment and plastic rotation in plastic hinges was established. By using the relationship, we developed a method for the evaluation of plastic rotations during the moment redistribution, addressing the effects of various design parameters including member stiffness, load condition, and plastic mechanism of structure.

• Journal of Environmental Science International
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• v.18 no.11
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• pp.1291-1297
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• 2009

The purpose of this study was to establish structural bone noise analysing method for apartments building floor with Structural-Acoustic coupling analysis. Nowadays, noise through floor is recognized as important problem with the consequence that noise isolation technique is studied in the various fields of industry. From among noise factors, resonance sound is main reason for floor's solid noise. therefore, In this study, evaluation method for composite material slab is established and that a case study is suggested with it.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.513-518
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• 1997

In this study, nine reinforced concrete infilled frames involved bare frames were tested during vertical and cyclic loads simultaneously. This test programs were carried to investigate the horizontal strength and the crack propagation in variance with hoop reinforcement ratio. All specimens were modeling in one-third scale size. In this experimental program structural performance of reinforced concrete shear wall were focus at connection types. Based on the test results, the following conclusions are made. In the boundary column member of reinforced concrete shear wall, increasing the ratio of hoop bar in two or three times, in the fully babel type, the shear and horizontal strength of specimens were increased 1.1-1.2 times than that of fully rigid frame. And infilled shear wall specimen were increased 1.17-1.27 times than that. Fully rigid babel type shear wall specimens were increased 5.7~8.0 times, and infilled shear wall specimens were increased about 4.0~5.6 times than that of infilled shear wall specimens.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.539-545
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• 1997

Since the length of massive wall-structure is generally longer and larger than its thickness and a lift height of concrete of placement, cracks induced by hydration heat are governed by outer structural restriction rather than inner one. However, the degree of restriction control is expected to be affected by the sizes of wall thickness, length and a lift height. Thus, this analytical study aims at the development of relationship among those to minimize thermal cracks. In addition, the effect of types of cement on the thermal heats and stresses is evaluated for anti-sulphate and 2blended Portland cements concrete. It was found from analytical study that a lift height of concrete placement is the most important factor controlling thermal cracks, and the increase of lift heights is not always detrimental to structural safety.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.719-724
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• 2013

In the case of newly developed stud which has more performance of sound transmission loss, it is expected that sound would transmit through runner than stud. so we developed construction method of runner and stud. As a result, sound transmission loss is improved about 2 dB by using this method. But this construction method could be applied to only newly developed stud. In addition, sound leak of wall joint is about 2 dB, and it could be improved by using rubber gasket at joint.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.05a
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• pp.579-585
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• 2002

This study has measured and evaluated the sound insulation of building elements of the hotel near airport. That measurement was made in both the actual site and laboratory. The differences of sound insulation performance in between granite and double glass were measured. Moreover, the difference of sound insulation was analyzed. For the measurement, this study has tried several methodologies, and analyzed the differences respectively. The results from this analysis were applied to produce a design guides for sound insulation to prevent external noise and to make more silent indoor space which satisfied the standard rate of noise.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05d
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• pp.346-351
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• 1996

현재 원전의 내진해석 절차에는 수직방향의 동적해석모델을 집중질량-보요소 모델로 나타내고 있으나, 층슬래브이 동적유연성을 합리적으로 고려할 수 있는 기준이 마련되어 있지 않다. 본 연구에서는 벽체로 지지된 4변고정 슬래브를 유한요소모델 및 집중질량모델로 이상화한 후 고유치해석 및 시간이력해석을 수행한 결과, 현재 층슬래브의 수직응답을 얻기 위해 통상적으로 사용되는 일련의 단자유도계 모델은 이에 상응하는 유한요소모델의 각 모드에 대한 평균응답밖에 주지 못함을 확인하였고, 각 모드 층슬래브의 최대응답을 얻기 위해서는 각 고유진동수가 최소한 이자유도계로 모델링되어야 하며, 이때 이자유도계에 분배할 질량 및 연결보의 강성크기가 각각 1:5와 1:6일때 잘 일치함을 확인하였다. 또한 이렇게 결정된 모델링 방법은 실제 전단벽 구조물의 해석을 통해 그 적용성이 입증되었다.

• Magazine of the Korean Society of Agricultural Engineers
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• v.42 no.3
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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.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.11a
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• pp.413-416
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• 2006

This paper presents the analytical results on the heat of hydration and induced thermal cracking of the wall elements in LiNAC that is a radioactive shield concrete structure. This wall elements measuring 1.2 m in thickness and 32 m in length tend to exhibit thermal cracking due to heat of hydration and high constraint effects caused by slab element located in the lower part of structure. In this analysis, four different construction stages were considered to find out the most effective concrete casting method in terms of thermal stress. Among the construction methods adopted in this analysis, the method of installation of construction connection measuring 1.2 m at the both side of wall elements was very effective way to control the thermal stress, resulting in increase thermal cracking index of wall elements in LiNAC structure. Finally, the wall elements in LiNAC structure was cast successfully according to the proposed construction method.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1993.10a
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• pp.185-190
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• 1993

최근 서울에서는 날로 심각해지는 교통난 해소대책으로 현재 운행중인 1-4 호선 외에 5-8호선의 공사가 한창 진행중이다. 이러한 지하철 통과 인접지역 에서는 지하철 운행 진동으로 인하여 상부나 인접 건물에 진동 영향이 우려 되는 경우가 많으며 이에 대한 대책으로 지하철 궤도부를 방진하거나 상부 의 건물을 지하철 구조체로부터 진동 절연하는 방법이 검토되고 있다. 이러 한 대책 수립시에는 대책후의 진동예측이 필요하며 지하철의 진동특성 입력 데이타 확보가 필수적이다. 본 연구에서는 이러한 필요성에 따라 서울의 2호 선 강남역과 교대역, 3호선 교대역 궤도부 주변 바닥과 벽체, 플랫폼, 표파는 층의 바닥에서 지하철 통과시의 전후, 좌우, 상하방향의 진동을 측정 분석하 여 추후 지하철 진동저감대책 수립에 기초자료로 제시하고자 한다.