• Journal of the Earthquake Engineering Society of Korea
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• v.14 no.6
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• pp.33-43
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• 2010

This paper deals with the hybrid structural test technique which has been introduced and studied currently in Korea. In this study, a Mini-MOST system which was developed as a part of NEES research was modified and improved to reduce the total simulation time to half of the original system. Using the proposed system together with the 2 dimensional small steel frame specimen, the validity and efficiency of the hybrid test technique is investigated. Even though the hybrid test has been developed as an alternative to the shaking table test and has been studied and applied for a long time in several countries, no attempt has been made to compare it directly with the shaking table test. Therefore, in this study, the hybrid test results are compared with those of the shaking table test as well as with a numerical simulation for the verification of hybrid test. From the comparison and analysis of the test results, it is concluded that the hybrid test can simulate the actual seismic behavior of structural systems very accurately and it can be a good alternative to the shaking table test.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.12
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• pp.1727-1738
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• 2002

세계화, 국제화, 개방화 시대에 살고 있는 우리가 통과의례나 전통 명절과 같은 특별한 행사에 의례복으로 한복을 애용하는 것은 한복이 한국의 문화적 이미지를 강하게 간직하고 있는 한국적 조형물 중의 하나이기 때문이다. 더우기 의례복은 특별한 행사 자체를 위해 착용되었던 만큼 당시대의 내 적 가치를 가장 현저하게 표출하고 있는 복식으로 인정 할 수 있기 때문이다. 본 연구의 목적은 시대 적으로 현대 전통 한복의 기본 형 식을 제공한 조선시대와 그 이후의 복식 중에서 특히 분명한 착용동기와 목적, 복식을 통해 나타내고자 하는 상징성 등을 함축하고 있는 아동용 의례복을 대상으로 복식의 형태, 색채, 문양, 소재 등의 조형 요소를 고찰하는 것이다. 또한 양식적 특성을 살펴보고, 그러한 조형적 특성을 형성시킨 당시대의 사상적 가치를 추론해 보는 것이다. 구체 적인 연구 방법은 먼저 관련된 문헌 고찰을 통한 이론적 배경을 토대로 하여 아동용 의례복의 범주를 설정하고 현재 보전중인 실물과 또는 사진, 풍속화에 나타난 복식 자료들을 수집하였다. 그리고 당시대의 사상적 배경에 대한 고찰을 병행하여 이들에 내재된 문화적 가치를 추출해 보았다. 연구 결과 양식적 특징으로는 남아의 두루마기나 전복 그리고 쓰개류 등에서 기능성을 고려한 변형적 양식이 나타나고 있었다. 색채 역시 음양 보색이나, 오행색을 바탕으로 한 기본색의 구성 이외 에도 소매나 섶에 응용된 색의 배열이나 맞깃 전복의 깃에 나타난 색의 조화는 다양한 색의 조형미를 표현하고 있었다. 특히 색동 등에 나타난 오행색의 배열, 안감과 겉감, 상의와 하의, 외의와 내의에 사용된 색의 조화는 미의식에 관한 문화적 가치를 추론해 볼 수 있다. 더우기 장식 표현에 주로 쓰인 자연물 문양이나 글자 문양은 당시의 지배 사상이 지향하는 덕목 이외에도 전통적으로 내재된 수명과 복록, 부귀와 영화에 대한 내적 가치들을 반영하는 조형적 상징들이라 할 수 있다. 소재는 비교적 계절을 고려하여 사용되고 있었지만 의례적 성격을 지닌 외의나 쓰개류의 경우 계절적 구분을 고려하지 않은 경우도 많이 나타나고 있었다. 장신구의 경우는 많이 사용되는 것은 아니나 역시 상징적 인 가치를 표현하는 실물들을 미적으로 재구성한 사례들이 나타나고 있었다. 이상의 연구를 통해 아동용 전통 의례복은 형태, 색채, 문양, 소재, 장신구 등에서 양식의 다양성과 변형들을 알 수 있었다. 또한 적극적인 내적 가치의 상징들을 복식을 통해 표현하고 있었음을 알 수 있었다. 현대 복식의 디자인에 있어 아동용 의례복에 나타난 창조적인 양식의 변형과 다양성 그리고 복식을 통한 내적 가치의 반영 등이 현대 사회와 조화를 이룬 실질적인 복식 디자인 제시 및 창작에 작은 영감으로 작용하길 바란다.

• Journal of Korean Society of Steel Construction
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• v.18 no.1
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• pp.23-32
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• 2006

This study was conducted to improve the design and construction technique of orthotropic steel-deck bridges. After conducting an F.E.M. analysis of the various rib types of the connection details, static and fatigue tests were conducted, using a three-dimensional, full-scaled, orthotropic, steel-deck-plate model with internal diaphrams, to check the fatigue strength depending on the types of details. The model structure was made of two types of longitudinal ribs: the domestic standard and the European rabbit types. The fatigue strength of the steel-deck system was found to have improved through the installation of an internal diaphram, as no cracks were found on the bottom round part of the scallop with a diaphram. There were no differences between the domestic and the European types of details in terms of strength may be partially influenced by the shape of the scallop and by the installation of an internal diaphram, but it can be improved more significantly according to the quality of the welding that will be done.

• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.2
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• pp.69-78
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• 1997

Recent test results of steel moment connections repaired with a haunch on the bottom side of the beam have been shown to be a very promising solution to enhancing the seismic performance of steel moment-resisting frames. Yet, litle is known about the effects of using such a repair scheme on the system seismic performance of structures. To investigate the effects of haunch repair on the system seismic performance, a case study was conducted for a 13-story steel frame building damaged during the 1994 Northridge earthquake. When haunches are incorporated in a steel moment frame, the response prediction is complicated by the presence of "dual" panel zones in the column. A new analytical modeling technique for the dual panel zone recently developed by the author was incorporated in the analysis. Incorporating the behavior of dual panel zone was among the most significant consideration in the analyses. Both the inelastic static and dynamic analyses did not indicate detrimental side effects resulting from the repair.he repair.

• Journal of the Earthquake Engineering Society of Korea
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• v.2 no.4
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• pp.115-122
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• 1998

This paper presents the cyclic seismic performance of slip-critically designed, high-strength bolted-beam splice in steel moment frames. Before the moment connection reaching its ultimate plastic strength, unexpected premature slippage occurred at the slip-critically designed beam splice during the test. The experimentally observed frictional coefficients were as low as about 50% to 60% of nominal(code) value. Nevertheless, the bearing type behavior mobilized after the slippage transferred the increasing cyclic loads successfully, i.e., the consequence of slippage into bearing was not catastrophic to the connection behavior. The test result seems to indicate that the traditional beam splice design basing upon(bolt-hole deducted) effective flange area criterion may not be sufficient in developing the plastic strength of moment connections under severe earthquake loading. New procedure for achieving slip-critical beam splice design is proposed based on capacity design concept.

• Journal of Korean Society of Steel Construction
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• v.25 no.1
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• pp.71-80
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• 2013

Fire-resistant (FR) test data for a square concrete-filled steel tube (CFT) columns consisting of high-strength steel (fy>650MPa) and high strength concrete (fck>100MPa) under axial loads are insufficient. The FR behavior of square high-strength CFT members was investigated experimentally for two specimens having ${\Box}-400{\times}400{\times}15{\times}3,000mm$ with two axial load cases (5,000kN and 2,500kN). The results show that the FR performance of the high-strength CFT was rapidly decreased at earlier time (much earlier at high axial load) than expected due to high strength concrete spalling and cracks. In addition, a fiber element analysis (FEA) model was proposed and used to simulate the fiber behaviour of the columns. For steel and concrete, the mechanical and thermal properties recommended in EN 1994-1-2 are adopted. Test results were compared to those of numerical analyses considering a combination of temperature and axial compression. The numerical model can reasonably predict the time-axial deformation relationship.

• Journal of Korean Society of Steel Construction
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• v.17 no.6 s.79
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• pp.689-697
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• 2005

Recent test results on reduced beam section (RBS) steel moment connections show that specimens with a bolted web connection tend to perform poorly due to premature brittle fracture of the beam flange at the weld access hole. A review of previous test results indicates that the higher incidence of base metal fracture in bolted-web specimens is related, at least in part, to the web bolt slippage and the high stress concentration at the weld access hole with the lowest material toughness. The practice of providing web bolts uniformly along the beam depth based on the classical beam theory is questioned in this paper. A new seismic design procedure, which is more consistent with the actual load path identified from the analytical and experimental studies, is proposed together with improved connection details. A test specimen designed following the proposed procedure exhibited a cyclic connection rotation capacity sufficient for special moment frames without fracture.

• Journal of Korean Society of Steel Construction
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• v.24 no.4
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• pp.423-433
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• 2012

This paper summarizes full-scale gravity-load test results on CFT column-to-RC flat plate connections reinforced with shearhead. CFT construction has many structural and constructional advantages over conventional steel and RC column construction and is gaining wide acceptance. Meanwhile the use of RC flat plate system in the basement and residential floors of tall buildings is often mandatory to reduce story height and enable rapid construction in domestic practice. Combining CFT column and flat plate floor is expected to result in further rapid construction. However, the issues related to connecting CFT column to RC flat plate have not been fully addressed yet. Several promising connecting schemes by using steel shearhead were proposed and tested in this study. Test results showed that the proposed connection can exhibit the punching shear strength higher than RC flat plate counterparts. An empirical formula that can reasonably predicts the punching shear strength of the proposed connection was also proposed.

• Journal of Korean Society of Steel Construction
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• v.18 no.4
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• pp.491-502
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• 2006

This paper summarizes full-scale test results on CFT column-to- flat plate connections has gained wide acceptance subjected to gravity loading. CFT construction has gained wide acceptance in a relatively short time in domestic building construction practice due to its various structural and construction advantages. However, efficient details for CFT column to flat plate connections have not been proposed yet. Based on the strategies that maximize economical field construction, several connecting schemes were proposed and tested. Test results showed strength and connection stiffness exceeding those of R/C flat p late counterparts. A semi-analytical procedure is presented to model the behavior of CFT column-to-flat plate connections. The five parameters to model elastic to post-punching catenary action range are calibrated based on the limited test data of t to progressive collapse prevention design is also illustrated.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.61-64
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• 2008

A combination of CFT column and RC flat plate without formworks is very effectively rapid constructions. This paper verified the lateral resisting capacity of CFT column-RC flat plate exterior connection in comparison with general RC column-flat plate connection and detected moment capacity and ductility capacity of connection according to moment-displacement ratio. We made and tested specimens which have different variables respectively and as a result derive a following conclusion. In CFT-E2 specimen a critical section was extended and maximum moment increased 20% respectively in comparison to general RC column specimen. In BME and CFT-E1 specimens generally shear governed behaviors and CFT-E2 specimen complemented with seismic band, flexure behavior region of slab was extended and also ductility ratio and energy absorptance increased.