• 한국구조물진단유지관리공학회 논문집
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• 제23권4호
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• pp.8-14
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• 2019

한국 전통 목조 건축물의 경우 구조적 성능은 재료 특성, 접합부의 형태, 치목의 정밀도 등에 따라 다르게 나타난다. 기존 사례 연구에서도 보와 기둥 접합부 형태는 변형 및 간격의 정도에 큰 영향을 미친다는 것을 보고하고 있다. 이는 단층 건물뿐만 아니라 대규모 다층 건물의 경우에도 마찬가지로 나타나고 있다. 따라서 본 연구에서는 접합부 형태에 대해 분석하고 모형을 제작하고 구조적 성능을 테스트하는 과정을 거쳤다. 그 결과, 주먹장맞춤의 실험체에서 최대 하중을 나타냈다. 각각의 형태의 접합부에 의한 구조적 성능을 종합하면, 도래걷이 주먹장맞춤이 가장 높은 성능을 나타내었으며, 다음으로 도래걷이 장부맞춤의 순으로 나타났다. 건물의 구조적 성능은 관통하는 보의 치목 형태와 기둥 내부의 접합부 형테에 따라 다르게 나타남을 알 수 있었으며, 이는 다층 건물의 신축 또는 복원을 위해 고려되어야하며 이후 계속 연구되어야 할것으로 사료된다.

• 한국건축시공학회지
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• 제19권3호
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• pp.255-261
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• 2019

건설업은 열악한 근무환경으로 인해 다른 산업에 비해 젊은 인력들이 건설업으로의 취업을 기피하여 국내 건설기능인력 수급에 어려움을 겪고 있다. 현재 대부분의 국내 건설인력들은 도제식 기술전수방식에 의해 기능을 습득하고 있다. 이에 본 연구는 도제식 기능교육방식에 대한 문제점을 도출하고 이에 대한 개선방안을 제시하였다. 현행 도제식 기능교육방식에 대한 개선방안으로 해당 건설현장에서 주기적으로 기능교육을 실시하고 이에 대한 교육이수 인증서를 각 건설회사에서 발급토록 하여 이를 교육경력으로 인정받을 수 있도록 제도를 정비하여야 한다. 또한 공공 건설기술교육원 및 정부지원 인가 전문기술학원 등과의 연계를 통해 신기술 신공법과 관련기술에 대한 이론교육을 무상으로 받을 수 있는 기회를 제공하고, 더 나아가 이 기간동안 생계유지를 위한 현실적인 적정 생계비용 지원정책을 수립하여 제공하는 방안이 시급히 필요하다.

• Earthquakes and Structures
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• 제20권2호
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• pp.215-224
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• 2021

The carbon dioxide present in the atmosphere is one of the main reasons for the corrosion of bridges, buildings, tunnels, and other reinforced concrete (RC) structures in most industrialized countries. With the growing use of fossil fuels in the world since the Industrial Revolution, the amount of carbon dioxide in urban and industrial areas of the world has grown significantly, which increases the chance of corrosion caused by carbonation. The process of corrosion leads to a change in mechanical properties of rebars and concrete, and consequently, detrimentally impacting load-bearing capacity and seismic behavior of RC structures. Neglecting this phenomenon can trigger misleading results in the form of underestimating the seismic performance metrics. Therefore, studying the carbonation corrosion influence on the seismic behavior of RC structures in urban and industrial areas is of great significance. In this study, a 2D modern RC moment frame is developed to study and assess the effect of carbonation corrosion, in 5-year intervals, for a 50 years lifetime under two different environmental conditions. This is achieved using the nonlinear static and incremental dynamic analysis (IDA) to evaluate the reinforcement corrosion effects. The reduction in the seismic capacity and performance of the reinforced concrete frame, as well as the collapse probability over the lifetime for different corrosion scenarios, is examined through the capacity curves obtained from nonlinear static analysis and the fragility curves obtained from IDA.

• 한국전통조경학회지
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• 제29권4호
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• pp.49-58
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• 2011

연구의 방법에 있어서, 주변경관에 영향을 주는 경관구성 중 건축의 색채 설계 자료로서 건축 각 부위의 벽, 지붕, 창문, 출입문 상태를 수집하였다. 또한 3배색 이미지 맵을 활용해서 색채의 경향을 분류하였다. 도시경관의 구성요소인 지역별 주요거리의 각 대상지역에 사용되어진 색채의 성질을 색상, 명도, 채도로 나타낸다. 각 대상지역 사용 색채 경향의 특성을 찾아내고 분석한다. 본 연구에서는 경관 관리 측면에서 비교적 색채의 배경이 잘 되어 있는 스웨덴 스톡홀름시의 실례를 대상으로 경관 색채 특성을 파악하였으며, 특히 경관 색채의 배경을 만들어 가는 마감재의 색채 사용에 대한 실태를 조사하였다. 관찰조사를 한 대상 지역은 각각의 8개 지역과 주 거리 이름의 색채 사용에 대한 자료를 수집하여 색채를 성분별로 분류하였다. 마감재에 있어서 지붕의 강판 종류와 적벽돌 종류, 아스팔트 슁글 종류, 도료 종류, 타일기와 종류 등의 색채 사용의 경향을 조사하여 분석하였다.

• 한국공간구조학회논문집
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• 제20권4호
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• pp.149-158
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• 2020

The governing equation for a dome-type shallow spatial truss subjected to a transverse load is expressed in the form of the Duffing equation, and it can be derived by considering geometrical non-linearity. When this model under constant load exceeds the critical level, unstable behavior is appeared. This phenomenon changes sensitively as the number of free-nodes increases or depends on the imperfection of the system. When the load is a periodic function, more complex behavior and low critical levels can be expected. Thus, the dynamic unstable behavior and the change in the critical point of the 3-free-nodes space truss system were analyzed in this work. The 4-th order Runge-Kutta method was used in the system analysis, while the change in the frequency domain was analyzed through FFT. The sinusoidal wave and the beating wave were utilized as the periodic load function. This unstable situation was observed by the case when all nodes had same load vector as well as by the case that the load vector had slight difference. The results showed the critical buckling level of the periodic load was lower than that of the constant load. The value is greatly influenced by the period of the load, while a lower critical point was observed when it was closer to the natural frequency in the case of a linear system. The beating wave, which is attributed to the interference of the two frequencies, exhibits slightly more behavior than the sinusoidal wave. And the changing of critical level could be observed even with slight changes in the load vector.

• 한국건축시공학회지
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• 제22권3호
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• pp.327-336
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• 2022

국내대학 교육은 코로나19 팬데믹으로 온라인교육의 비중이 급격히 증가하였다. 본 연구는 온라인교육을 적극적으로 활용한 건축시공학 블렌디드러닝 교육과정을 개발하였다. 코로나19 팬데믹 이후, 국내대학 건축시공 분야의 교과목 운영 실태를 분석하였다. 온라인교육의 비중이 약 66.1%, 대면강의가 약 33.9%로 조사되었다. 온라인교육의 비중이 급격히 증가한 것으로 분석되었다. 건축시공학 교과목의 블렌디드러닝 교육과정을 개발하였다. 개발된 교육과정은 일주일 단위의 교육절차, 15주차별 교육내용을 중심으로 하였다. 본 연구에서 제시한 교육과정을 대학에서 적용할 때는 교수자의 교육목표와 학습자의 학습능력 등에 따라 융통성있게 적용할 수 있을 것이다.

• 한국구조물진단유지관리공학회 논문집
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• 제25권6호
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• pp.185-192
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• 2021

본 연구에서는 거푸집 패널이 부착된 실물 스케일의 중공슬래브 Mock-up을 제작하여 즉시 처짐 및 장기 처짐에 대한 플랫 플레이트 중공 슬래브의 안전성을 평가하고자 한다. 중공재가 적용된 Mock-up 실험체의 중공률은 24%로 설계하였다. 콘크리트 블록 하중 재하 시 슬래브의 가장 중앙부의 처짐인 No2의 경우 재하 시 처짐이 8.88mm 발생하였으며 이는 즉시 처짐에 대한 기준 값(l_n/240=17.93mm)에 비하여 안전한 값을 나타내고 있다. 3개월간 처짐 량 계측 결과, 중앙부 처짐 량은 초기 처짐에서 6.792mm 더 추가되어 처짐이 발생하였지만, 이는 국내 구조 기준에서 제시하고 있는 사용하중에 의한 기준 값을 만족하고 있는 것으로 나타났다.

• Earthquakes and Structures
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• 제23권2호
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• pp.151-168
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• 2022

Torsion is one of the most important causes of building collapse during earthquakes. Sometimes, despite the symmetric form of the building, infill walls disturb the symmetry of the lateral resisting system. The purpose of this research is to investigate the effect of urban layout on developing torsion caused by infill walls. For this purpose, a typological study was conducted based on the conditions of perimeter walls on 364 buildings and then 9 cases were selected. The dimensions of the selected buildings are constant and the conditions of the perimeter walls including facades with openings and cantilevered facades are variable. The selected buildings with 60 different layouts of infill walls were analyzed and the behavior of each one was evaluated based on the torsional irregularity criteria of seismic codes. The results of the analyses showed that if the perimeter walls of a building are symmetric, asymmetric interior walls will not be important in developing torsion and effective parameters in symmetry of the perimeter infill walls are the number of walls, area of openings, aspect ratio, and construction details. Finally, architectural solutions to mitigate the torsional effects of infill walls were proposed for buildings with solid infill walls on some sides, for buildings where the perimeter walls of one side are on the cantilevered part, and for buildings where the perimeter walls of two adjacent sides are on the cantilevered part. In three-sided buildings, where two adjacent façades are cantilevered, it is often impossible to use the potential of the infill walls.

• Advances in concrete construction
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• 제15권3호
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• pp.203-213
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• 2023

New techniques, technologies, and materials should be used to design and build sports stadiums. Since this century, much progress has been made in covering the roofs of sports stadiums, and the possibility of accurate computer calculation has been provided for stadiums, so by choosing a new structure, we can double the beauty and resistance of these stadiums. A stadium has an excellent and valuable design when its structure, shell, building, materials, and joinery follow a high architectural idea at all levels and scales. This article examines the mechanical performance of polymer cement strength in the construction of football stadiums, along with their structural knowledge in the form of the best examples in the world. Portland cement is one of the most used materials for constructing football stadiums. However, its production requires spending a lot of money, wasting energy, and damaging the environment. Considering the disadvantages in the production and consumption of concrete in different environments, it is necessary to find alternative materials. It should be used with cheaper, simpler technology, abundant primary resources, energy saving, less environmental damage, and better chemical and physical properties in concrete. High-strength concrete technology is considered a new development in the construction industry of concrete structures. In hardened concrete, strength and durability are two main factors, and as the compressive strength of concrete increases, concrete becomes more brittle. As a result, its tensile strength does not increase in proportion to the increase in compressive strength and has less strain tolerance. For this reason, the need to use is evident from the fibers in high-strength concrete. Fibers are used in concrete to increase tensile strength, prevent crack propagation, and significantly increase softness. The increase with the change of these resistances depends on the strength of concrete without fibers, the shape of fibers, and the percentage of fibers. This cement is obtained from the wastes of chemical and petrochemical industries and the wastes from coal combustion, which have the properties mentioned as substitutes for Portland cement.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.992-1000
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• 2022

Heritage buildings (HBs) as structures with historical and architectural relevance that form an integral part of contemporary society. HBs deserve to be protected for as long as possible to retain their significance. Therefore, prioritizing HB maintenance management (HBMM) is pertinent. However, the decision-making process of HBMM can be relatively daunting. The decision-making challenge may be attributed to the multiple 'stakeholders' expectation and requirement which needs to be met. To this end, professionals in the built environment have identified the need to apply the strategic concept of facilities management (FM) in decision making. However, studies exploring the application of FM in decision-making seem lacking. To bridge this gap, this study focuses on developing a framework for strategic decision-making HBMM, which helps achieve HBMM sustainability. At the study's inception, relevant works of literature in the domains of HBMM and FM were conducted. This review helped identify contemporary maintenance practices and their applicability to HBMM. Afterward, a conceptual framework to aid decision-making in HBMM was developed. This framework integrated the concept of FM scope (people, place, process, and technology) while ensuring that decisions and plans were made at strategic, tactical, and operational levels. The conceptual framework presents a holistic guide for professionals in HBMM to ensure that decision processes and outcomes are practical and efficient. It also contributes to the existing body of knowledge on the integration of FM in HBMM. Furthermore, it will help achieve HB sustainability through an effective decision-making process.