• Title/Summary/Keyword: 모듈러 구조물

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Numerical Study on Freezing and Thawing Process in Modular Road System (모듈러 도로시스템의 동결-융해에 대한 수치해석적 연구)

  • Shin, Hosung;Kim, Jinwook;Lee, Jangguen;Kim, Dong-Gyou
    • Journal of the Korean Geotechnical Society
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    • v.33 no.3
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    • pp.49-62
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    • 2017
  • In order to understand response of geo-structures to the freezing-thawing process in the ground, it is necessary to consider phase change of the pore water of the ground and also to understand soil interaction with structures. In this study, numerical analysis was carried out for freezing and thawing effect on the modular road system. Neumann's theoretical equation for freezing-thawing processes in porous media can be used to estimate frozen depth and heaving from basic soil properties and ground and surface temperature, but its application is limited to the case for the sediment with fully saturated condition and zero unfrozen water content. Numerical analysis of the modular road system was performed on various soil types and different ground water table as the varying freezing index. The amount of heaving in the silty soil was much larger than those in granite weathered soil or sandy soil, and lowering groundwater level reduced ground heaving induced by freezing. Numerical analysis for temperature history of the ground surface predicted residual heaving near the surface by the freeze-thaw process in silty soil. It ought to reduce stiffness and bearing capacity of the ground so that it will impair stability and serviceability of new road system. However, the amount of residual heaving was insignificant for the road system installed in weathered soil granite and sandy soil. Since modular road system is a pavement structure mounted on the supporting substructure unlike the prevalent road pavement system, strict criteria should be applied for uniform and differential settlement of the pavement system.

A Business Model for Application of the Modular Building in the Rental Market (건축 임대시장에서 모듈러 건축의 적용성 연구 - 수익성 분석을 중심으로 -)

  • Yoon, Jongsik;Shin, Dongwoo;Cha, Heesung;Kim, Kyungrai
    • Korean Journal of Construction Engineering and Management
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    • v.16 no.6
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    • pp.3-11
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    • 2015
  • The current real estate market is in a state that is considerably shrink due to the recession and long-term reduction of trading. In response, the government recently announced an innovative way for the middle-class residential housing and it is taking the lead to activate the real estate market. Meanwhile, the domestic housing market is entering a transition period, including structural changes of household structure, changes from joeonse to rent increasingly. Also single-member households will rise steeply, so that makes the high demand of small houses. In addition, the domestic construction industry is interested in new technology called Modular building. The Modular construction is an off-site construction system that shorten construction period, eco-friendly building technology and mobility etc, which can be used in various field. Overall, there are two major issues of the current market, one is the change of the real estate market, and the other is the modular construction. This study will propose modular business model in the rental market through the analysis the profitability of the modular business scenarios and IRR analysis.

Detailed Analysis of Vertical Connector in Modular Roadway Slab Under Temperature and Lifting Loading (온도하중과 인양하중에 영향을 받는 모듈러 도로 슬래브 수직연결부의 상세해석)

  • Kim, WooSeok;Nam, Jeonghee;Min, Geunhyeong;Kim, Kyeongjin;Lee, Jaeha
    • Journal of the Korea Concrete Institute
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    • v.28 no.5
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    • pp.509-517
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    • 2016
  • In terms of bridge construction, the concrete deck slab is weak members compared to beam members of the bridge supports. Deck slabs must be sound to support and distribute vehicle loads. If slabs are not enough to support the loads, it should be replaced. Bridge deck replacement has been an important industry over the world since the construction is simplified to shorten construction time and to save construction costs. Slab module provides a quickly, easily and reliably construction method in order to avoid high cost and minimum traffic disruption. in addition, slab module shows high reliability since they are factory products. However, slab module should be considered in the performance under various loads. In this study, structural analysis is performed to evaluate the performance of slab module under vehicle loads and temperature loads. Spiral rebar is also utilized around the vertical joints to improve the structural integrity under the lifting loads. In order to confirm the weak area of slab module for the lift condition, numerical analysis has been performed.

Frequency-Domain Analysis for Motion of Floating Structures with Perforated Wall (유공벽이 설치된 부유체 동요 평가를 위한 주파수 영역 해석)

  • Jeongsoo Kim;Youn Ju Jeong;Young-Taek Kim
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.36 no.1
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    • pp.1-10
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    • 2024
  • As increasing demands for a floating structure expanded from offshore industry facilities to living facilities, it has emerged that necessity of techniques to reduce motions of a floating structure. This study present a floating structure with porosity on the outer surface of the floater. Under each regular and irregular wave, responses of the floater was investigated in frequency domain. The proposed structure is composed of inner and outer floaters, which are connected to each other and the outer wall is perforated, and the heave and the pitch of floaters with different perforation rates (0~30%) were compared with at both the center and the edge. The results showed that pitch responses can be decreased by increasing of perforation rate of the floater. Comparing with responses of the non-perforated floater, those of the proposed floating structure were reduced to above 10% and 2%, respectively for regular and irregular wave conditions.

Comparison of Characteristics for Establishing Quality Standards of Modular Buildings for Temporary Classrooms (임시교실용 모듈러 건축물의 품질기준 마련을 위한 특성비교)

  • Lee, Jong Sung;Park, Jae-Woong;Lim, Gun-Su;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.83-84
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    • 2023
  • Wall structure smart modular is a building construction method where modules are manufactured in a factory and assembled on-site. This method is gaining popularity in the construction industry as it reduces construction time and mitigates risks such as material supply and labor costs. Wall structure smart modular is necessary as it provides comfortable temporary classroom space during renovation and remodeling of aging school buildings. The structure and characteristics of each type of temporary classroom modular were compared, and wall structure modular showed superior performance in terms of height and weight competitiveness compared to mixed structures. With these advantages, wall structure modular can ensure economic efficiency and recyclability as a temporary classroom. In the future, we aim to compare and analyze the standards such as inter-floor noise and heat transfer coefficient for wall structure and mixed structures.

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Proposal of a Classification System of Checklists for Safety Management of On-Site Workers in Modular Construction (사례분석을 통한 모듈러 건축의 현장 작업자 안전관리 체크리스트의 분류 체계 제안)

  • Jun, Younghun;Kim, Kyoontai;Jeon, Eunbi
    • Korean Journal of Construction Engineering and Management
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    • v.22 no.6
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    • pp.120-130
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    • 2021
  • Recently, the government is reinforcing safety management at construction sites to prevent safety accidents in construction works, and the safety management plan of workers is an important situation. Meanwhile, modular construction is expected to be gradually expanded to middle and high-rise buildings, but active measures to ensure worker safety are insufficient. This study is a preliminary study of the development of a checklist for preventive worker safety management. The purpose of this study is to derive a checklist classification system for the safety management of workers in the field of modular construction by preceding studies, case analysis, and expert advisory opinions. The classification system consists of large categories of factory manufacturing, transportation, and on-site construction, and the sub-system consists of six sub-classes: foundation work, frame work, modular frame installation work, finishing work, and facility work. Among them, the sub-classification of modular frame installation work consists of 12 unit works, centering on module lifting and assembly module work, which are the main construction processes. And the classification system reflects the three main management factors and contents for defined safety management. It is expected that the research results of this study can contribute to efficient safety management at the modular construction site.

Behavior of C-Shaped Beam to Square Hollow Section Column Connection in Modular Frame (모듈러 골조의 각형강관 기둥과 C형강 보 접합부의 거동 평가)

  • Lee, Sang Sup;Park, Keum Sung;Hong, Sung Yub;Bae, Kyu Woong
    • Journal of Korean Society of Steel Construction
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    • v.27 no.5
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    • pp.471-481
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    • 2015
  • Modular building is a prefabricated construction system for building where factory-produced pre-engineered modular units are delivered to site and assembled as substantial elements of a building. There are two basic kinds of modular structures. One is a load-bearing wall structure designed to transfer the load through longitudinal walls. The other is a frame structure composed of columns and beams. For frame structure, square hollow section is often used as a column member and channel as a beam member in modular unit. Lower and upper modules are fasten with bolts via a pre-installed access hole in the SHS column. However, the access holes can weaken the panel zone that would affect the behavior of beam to column connection. The 5 specimens of beam to column connections with parameters of access hole, column thickness and diaphragm were made and this paper describes the test results.

Development of Hybrid Panel with C-shaped Steel Beam at Top and Bottom of Precast Concrete Wall (프리캐스트 콘크리트 벽체의 상하부에 C형강 보가 결합된 복합 패널의 개발)

  • Lee, Sang Sup;Park, Keum Sung
    • Journal of Korean Society of Steel Construction
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    • v.29 no.6
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    • pp.435-442
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    • 2017
  • A lateral load resisting system is a necessary structural element for the mid- to high-rise modular buildings and concrete cores are known as the most typical lateral load resisting systems in 10- to 20-story modular buildings. It is difficult to construct a concrete core simultaneously with the installation and finishing work of modular units because concrete placed using wet methods might contaminate or destroy the modular unit. Therefore, we have developed a hybrid PC (precast concrete) panel construction method that can construct a concrete core together with the installation of modular units. The hybrid PC panel is a load-bearing element in which a pair of C-shaped beams are combined at the top and bottom of a concrete wall. Concrete cores can be constructed by dry method to connect the hybrid PC panels with bolts. In this study, the details and connection of hybrid PC panels are improved to have the lateral performance comparable to reinforced concrete structural walls and are verified through FE analysis.

Connection Behavior of FRP Box Member of Connection Method (연결방법에 따른 FRP 박스 부재의 연결거동 특성)

  • Jang, Hwa-Sup;Kim, Ho-Sun;Kwak, Kae-Hwan
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.23 no.5
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    • pp.455-463
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    • 2010
  • This is a basic experimental study to apply FRP modular box member to a variety of construction structures exposed to flexural strength, such as a slab and a girder. Tests were conducted under various conditions in order to analyze jointing performance features of the developed FRP modular box member as a large section. For the methods of jointing FRP modular box member, chemical connection, mechanical connection, and a combination of both were used to test both vertical and horizontal jointing. As a result of the test, using urethane+two bolts+sheets was the most efficient method of connecting FRP modular box member, and confirmed the efficient behavior by a finite element analysis.

Lateral-resisting Structural Systems for Tall Modular Buildings (모듈러 건축물의 수평력 저항 구조시스템)

  • Lee, Chang-Hwan;Chung, Kwang-Ryang
    • Journal of Korean Association for Spatial Structures
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    • v.16 no.2
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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.