• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.571-578
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• 2022

Modularization in a high-rise building is different from a small building, as it is exposed to more lateral forces like wind and earthquakes. The integrity, robustness, and overall stability of the modules and their performance is based on the joining techniques and strong structural systems. High lateral stiff construction structures like concrete shear walls and frames, braced steel frames, and steel moment frames are used for the stability of high-rise modular buildings. Similarly, high-rise stick-built buildings have concrete cores and perimeter frames for lateral load strength and stiffness. Methods for general steel-concrete connections are available in many works of literature. However, there are few modular-related papers describing this connection system in modular buildings. This paper aims to review the various research and practice adopted for steel-to-concrete connections in construction and compare the methods between stick-built buildings and modular buildings. The literature review shows that the practice of steel module-to-concrete core connection in high-rise modular buildings is like outrigger beams-to-concrete core connection in stick-built framed buildings. This paper concludes that further studies are needed in developing proper guidelines for a steel module-to-concrete core connection system in high-rise modular buildings.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.704-705
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• 2015

Recent research has been ongoing for modular buildings in the country, and interest increases. However, in accordance with legal restrictions in the country with regard to Project Delivery system of Modular Building, the activation of modular buildings industry is obstructed. In Korea, in accordance with national contract law, the construction contract is apply to the project delivery system of modular buildings, and in accordance with Framework Act on the Construction Industry, The project delivery system of modular buildings has to be a separate order. The definition of separate order in contract as defined in the law is that the electric work and Communication work and digestion facility work has to be separate each contract in order to be ensured professionalism. In accordance with law, the project delivery system of modular buildings is that the contract for construction is concluded with the Owner and the Construction Contractor and the contract for goods is concluded with the construction Contractor and modular manufacturer. Due to these project delivery system, the domestic factory production rate when making a modular unit is significantly reduced compared to the rate of factory production abroad and the domestic factory production rate is estimated to 10-20%. Due to the factory production rate is also low, despite what can be done at the factory the workload in construction field increases. According to the workload in field increases, the effect of the schedule reduction can be reduced. It resolved to form a consortium with a modular manufacturer and construction companies or the contract is concluded with Owner, modular manufacturer and construction companies in each. In this paper, we propose a specific project delivery system for modular building to solve the problem of the low factory production rate and the problem of schedule reduction. Through this paper, due to the variety of project delivery system on modular buildings is expected to contribute to the activation of modular buildings.

• Earthquakes and Structures
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• 제11권6호
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• pp.1061-1076
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• 2016

Prefabricated Modular Buildings are increasingly becoming popular in the construction industry as a method to achieve financially economical buildings in a very short construction time. This increasing demand for modular construction has expanded into multi-storey applications where the effect of lateral loads such as seismic loads becomes critical. However, there is a lack of detailed scientific research that has explored the behaviour of modular buildings and their connection systems against seismic loads. This paper will therefore present the nonlinear time history analysis of a multi-storey modular building against several ground motion records. The critical elements that need special attention in designing a modular building in similar seismic conditions is discussed with a deeper explanation of the behaviour of the overall system.

• 한국공간구조학회논문집
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• 제16권2호
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• pp.79-88
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• 2016

Modular buildings are constructed by assembling modular units which are prefabricated in a factory and delivered to the site. However, due to a problem of noise between floors, concrete slab is usually poured at the top or bottom level of a modular unit in Korea. This greatly increases the weight of buildings, but designing vertical members of modular units to resist overall gravity loads is very inefficient. In this study, considering domestic building construction practices, feasible structural systems for tall modular buildings are proposed in which separate steel frames and reinforced concrete core walls are designed to resist gravity and lateral loads. To verify performance, a three-dimensional structural analysis has been performed with two types of prototype buildings, i.e., a residential building and a hotel. From the results, wind-induced lateral displacements and seismic story drifts are examined and compared with their limit values. Between the two kinds of buildings, the efficiency of the proposed system is also evaluated through a comparison of the weight of structural components. Finally, the effect of a floor diaphragm on the overall behavior is analyzed and discussed.

• 한국건설관리학회논문집
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• 제20권3호
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• pp.12-21
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• 2019

시방서는 공사를 진행함에 있어서 계약의 서류뿐만 아니라 안전한 시공성의 확보와 품질을 향상시킬 수 있는 중요한 서류가 된다. 현재 국내에 모듈러 건축물에 사용하고 있는 시방서는 공사 시방서 밖에 없으며, 대부분의 내용이 건축표준시방서를 그대로 차용하여 사용하고 있어 모듈러 건축물의 작업 내용을 반영하지 못하고 있어 구성내용이 지침서에 가깝다. 국내 모듈러 건축물 시방서의 현 상황은 모듈러 건축물의 품질 저하에 영향을 미치고 있다. 따라서 모듈러 건축물의 모듈러 공정 모니터링을 통한 세부적인 프로세스 분석과 분석된 activity를 가지고 단계별 연관관계를 IDEF모델링을 적용하여 체계적으로 분석하고, 일반화를 통하여 모듈러 건축물에 특화된 전문시방서의 구성체계를 제안하고자 한다. 도출한 대분류는 크게 공장제작, 운송, 현장설치 총 3가지로 나누어지며, 하위 구성체계는 전문가 자문의견을 반영하여 공장제작의 바닥판 조립에서부터 현장설치의 접합부위 마감까지 총 32가지의 공사 항목으로 나누어지는 것으로 도출하였다.

• 한국건설관리학회논문집
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• 제22권3호
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• pp.31-39
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• 2021

모듈러 공법은 내장재와 기계·전기 설비 등이 시공된 구조체를 제작 공장에서 건설 현장으로 운반하여 설치 및 시공하는 공법이다. 모듈러 공법은 특히 주택과 같은 소규모의 비교적 구조가 간단한 건축물을 대상으로 활발하게 적용되고 있는 추세이다. 국내건설 산업에 모듈러 주택의 도입된 기간이 길지 않은 만큼 아직 모듈러 주택의 환경적 특성에 대한 연구가 부족한 실정이다. 따라서 본 연구의 목적은 모듈러 주택의 단열성능을 적외선 이미지 분석과, Air-Surface Thermal Ratio 방법, 실내외 온도차비를 활용하여 실증적으로 분석하는 것이다. 이를 위해 실제 서울시에 위치한 준공 후 2년이 경과된 모듈러 주택과 RC 주택을 비교하여 단열성능 분석하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제23권4호
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• pp.15-22
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• 2019

국내 건축법에는 표준 내화구조인 KS F 1611-5에서 1시간 내화성능을 갖는 각형강관에 대한 사양적 기준만을 제시하고 있어 각형 강관에 적용되는 모듈러 건축물을 중 고층에 적용하기 위해서는 한계가 있다. 따라서 내화성능 평가를 통해 2시간 인정을 받은 모듈러 구조에 한하여 중 고층 건축물에 적용이 가능하다. 본 연구에서는 KS F 2257-1 및 KS F 2257-4 기준에 의거하여 실대형 내화실험을 수행하였다. 평가결과 OW-01 및 OW-02 실험체의 경우 각형강관의 온도상승 및 강도 저하로 인해 면외좌굴이 발생하여 2시간 내화성능을 확보하지 못하였으나, 피복 및 각형강관 두께를 보완한 IW-01 및 OW-03 실험체의 경우 충분한 차열성능으로 인해 2시간 내화성능을 확보하여 중고층 모듈러 건축에 적용하는 것이 가능한 것으로 판단되었다.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.132-137
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• 2015

A modular construction method includes factory-prefabricated room-sized volumetric units. Although low-rise buildings have been constructed worldwide using this method for more than 30 years, it is a relatively new technology in high-rise construction. There are three basic methods of constructing high-rise buildings using modular construction: the core method, the core-and-podium combination method, and the modular in-fill method. While the first two have been used in the USA and in several European countries, the third method, introduced in 2011 by an international cruise ship development firm, is a rather new approach for which there are few case histories. Therefore, its applicability and construction feasibility should be verified. As a pilot study to test the applicability of the modular in-fill method, a 12-story residential building was built in Korea. This paper describes a case study of the pilot project. The advantages and disadvantages of the method and its applicability in terms of cost effectiveness and construction schedule management were evaluated.

• Structural Engineering and Mechanics
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• 제89권5호
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• pp.525-538
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• 2024

An explosion from a specific source can generate high pressure, causing damage to structures and people in and around them. For the design of protective structures, although explosion overpressure is considered the main loading parameter, parts are only considered using standard design procedures, excluding special installations. Properties of the explosive, such as molecular structure, shape, dimensional properties, and the physical state of the charge, determine the results in a high-grade or low-grade explosion. In this context, it is very important to determine the explosion behaviors of the structures and to take precautions against these behaviors. Especially structures in areas with high explosion risk should be prepared for blast loads. In this study, the behavior of non-anchored blast resistant modular buildings was investigated. In the study, analyzes were carried out for cases where modular buildings were first positioned on a reinforced concrete surface and then directly on the ground. For these two cases, the behavior of the modular structure placed on the reinforced concrete floor against burst loads was evaluated with Stribeck curves. The behavior of the modular building placed directly on the ground is examined with the Pais and Kausel equations, which consider the structure-ground interaction. In the study, head and neck injuries were examined by placing test dummies to examine human injury behavior in modular buildings exposed to blast loads. Obtained results were compared with field tests. In both cases, results close to field tests were obtained. Thus, it was concluded that Stribeck curves and Pais Kausel equations can reflect the behavior of modular buildings subjected to blast loads. It was also seen at the end of the study that the human injury criteria were met. The results of the study are explained with their justifications.

• 한국태양에너지학회 논문집
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• 제34권3호
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• pp.107-114
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• 2014

Modular systems are widely used in various building types including housing, dormitory, and barracks. Steel studs have many advantages over other materials as construction components of modular buildings in terms of seismic performance, durability and maintenance. However, steel stud modular systems also have weakness in condensation resistance due to high thermal conductivity of steel. The purpose of this study is to investigate the condensation resistance of steel stud wall corner details in modular buildings by thermal simulation. The condensation resistance was evaluated by temperature difference ratio according to ISO 13788. The result showed that there was little difference between the alternatives of adding cavity and insulation. Separation of interstitial steel studs showed outstanding effect on the improvement of temperature difference ratio.