• Magazine of korean Tunnelling and Underground Space Association
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• v.14 no.3
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• pp.31-37
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• 2012

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.583-584
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• 2013

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.585-586
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• 2013

• Proceedings of the KWS Conference
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• 2005.06a
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• pp.241-243
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• 2005

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.410-411
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• 2013

• Magazine of korean Tunnelling and Underground Space Association
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• v.23 no.2
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• pp.43-62
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• 2021

• Journal of Korean Society of Steel Construction
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• v.26 no.5
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• pp.431-439
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• 2014

Concrete filled tubular columns are widely used because the mutual reaction between the concrete and the tube improves strength and ductility of the columns. In an attempt to secure efficient use of members, built-up square columns featuring large width-thickness ratio and the use of thin steel plates are suggested in this study. In order to evaluate the structural characteristics and seismic performance of the column-to-beam connections of the new shape columns, cyclic load test of T-shaped column-to-beam connections was conducted with variables of diaphragms and concrete-filling. Moment-rotational angle relationship, dissipated energy and failure behavior were compared to evaluate stress transfer mechanism of the new shape built-up square column-to-beam connections associated with the variables.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1358-1362
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• 2007

자연하천에서 합류부 흐름 및 하상변동 특성이 매우 복잡하기 때문에 하천 복원 사업을 수행하면서 합류부에서 이에 대한 분석이 간과되고 있다. 특히 합류부 주변에 설치된 교량이 흐름에 미치는 영향에 대해 연구가 매우 부족한 실정이다. 본 연구에서는 실제 교각의 배치, 형상 및 제원이 고려된 격자망을 이용하여 합류부 주변에 위치한 교량에 의한 흐름 특성을 분석하였다. 연구 대상 구간은 대전광역시를 관통하여 흐르는 갑천과 지류인 유등천이 합류하는 지점으로서, 빈도별 홍수량(200년 빈도)에 대하여 흐름특성을 분석하였다. 유등천은 합류점 상류부에서 갑천 고속화도로를 위한 교량이 건설되기 전보다 설치 후에 유속 분포 변화가 크게 나타나며, 특히 우안 고수부지 지역에서 유속 감소가 뚜렷하게 나타났다. 또한 교각 설치 후 수심 분포는 배수영향으로 증가하지만 증가량은 0.2m 미만으로 크지 않았다. 합류 후 단면에서는 수심 분포가 교량 설치 전후 전체적으로 일치하는 형태를 나타내고 있지만, 유속은 좌안에서 우안으로 갈수록 교량 설치 전 유속이 설치 후 유속보다 크게 나타나는 현상이 나타나고 있다. 교량 설치 후 좌안에 단위 폭당 유량과 유속이 증가하고, 우안에서는 유속이 감소하며 홍수량이 증가할수록 그 특징은 뚜렷하게 나타나고 있다.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.233-236
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• 2008

This study evaluates the seismic performance of post-tensioned(PT) flat plate frames with or without slab bottom reinforcement. For this purpose, 3 and 9 story PT flat plate frames designed only considering gravity loads. This study conducts a nonlinear static pushover analysis. This study use an analytical model which is able to represent punching shear failure and fracture mechanism. The analytical results showed that seismic performance of PT flat plate frame is strongly influenced by the existence of slab bottom reinforcement through column. By placing slab bottom reinforcement in PT flat plate frame, lateral strength and deformation capacity are significantly increased.

• Journal of the Korean Geosynthetics Society
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• v.11 no.2
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• pp.11-20
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• 2012

Partially penetrated SCP method is to install sand compaction piles in a soft clay layer not penetrating to the bed layer. In this study, consolidation behaviors of soft grounds improved by both partially and fully penetrated SCP methods are presented. When the replacement ratio is low, the settlement characteristic of the ground improved by fully penetrated SCP method seems to be consistent regardless the degree of consolidation. On the other hands, the ground improved by partially penetrated SCP method appears to decrease depending on the degree of consolidation. In addition, the settlement of upper clay layer is more increasing as the penetration ratio ($H_d/H$) is decreasing. No effect of stress concentration at the lower part of the partially penetrated SCP method is developed. The ratio of stress sharing appears to be almost consistent regardless the degree of consolidation.