• Advances in concrete construction
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• 제13권 2호
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• pp.153-162
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• 2022

Prefabricated exterior wall panel is the main non-load-bearing component of assembly building, which affects the comprehensive performance of thermal insulation and durability of the building. It is of great significance to develop new prefabricated exterior wall panel with durable and lightweight characteristics for the development of energy-saving and assembly building. In the prefabricated sandwich insulation hanging wall panel, the selection of material for the outer layer and the arrangement of the connector of the inner and outer wall layers affect the mechanical performance and durability of the wall panels. In this paper, high performance cement-based composites (HPFRC) are used in the outer layer of the new type wall panel. FRP bars are used as the interface connector. Through experiments and analysis, the influence of the arrangement of connectors on the mechanical behaviors of thin-walled composite wall panel and the panel with window openings under two working conditions are investigated. The failure modes and the role of connectors of thin-walled composite wallboard are analyzed. The influence of the thickness of the wall layer and their combination on the strain growth of the control section, the initial crack resistance, the ultimate bearing capacity and the deformation of the wall panels are analyzed. The research work provides a technical reference for the engineering design of the light-weight thin-walled and durable composite sandwich wall panel.

• 한국화재소방학회논문지
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• 제31권5호
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• pp.37-43
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• 2017

국내 샌드위치패널 건축물은 공장 창고시설의 벽 지붕에 널리 사용된다. 공장 창고시설은 용도특성상 화재하중이 높고 화재확산이 신속히 진행되어 대형화재로 이어지며 재료특성 상 벽 지붕이 무너져 인명피해 및 재산피해가 증가하고 있는 추세이다. 이를 위하여 본 연구에서는 샌드위치패널 스프링클러설비의 국내 외 관련기준을 검토하였다. 현장조사결과 가연물이 벽면에 밀착되어있는 경우가 있어 벽면으로부터 10 cm, 60 cm, 120 cm 이격하여 벽면보호여부를 확인하는 실험을 수행하였다. 화재실험결과, 방수압력 0.1 MPa, 방수량 K-80의 헤드 설치 시, 샌드위치패널착화방지를 확인하였다. 또한 가연물이 벽면으로부터 60 cm일 때 샌드위치패널벽면의 최고온도가 $525^{\circ}C$, 120 cm에서는 최고온도가 $276^{\circ}C$로 측정되었다. 한편, 국외소방연구기관의 EPS 샌드위치패널연구에 따르면 발화점이 $450^{\circ}C$인 것을 감안할 때, 패널 벽면에서 가연물거리는 120 cm 이상 이격하면 착화방지가 가능함을 확인하였다.

• Advances in concrete construction
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• 제9권5호
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• pp.459-467
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• 2020

Mechanical and thermal properties of composite sandwich wall panels are affected by changes in their external environment. Humidity and temperature changes induce stress on wall panels and their core connectors. Under the action of ambient temperature, temperature on the outer layer of the wall panel changes greatly, while that on the inner layer only changes slightly. As a result, stress concentration exists at the intersection of the connector and the wall blade. In this paper, temperature field and stress field distribution of UHPC-RW-RC (Ultra-High Performance Concrete - Rock Wool - Reinforced Concrete) wall panel under high temperature-sprinkling and heating-freezing conditions were investigated by using the general finite element software ABAQUS. Additionally, design of the connection between the wall panel and the main structure is proposed. Findings may serve as a scientific reference for design of high performance composite sandwich wall panels.

• 대한건축학회논문집:구조계
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• 제34권1호
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• pp.79-87
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• 2018

The purpose of this study was to analyze factors influencing insulation performance of inorganic Autoclaved Lightweight Concrete(ALC) sandwich wall panels with the application of shear connectors. To analyze the effect of shear connectors on the thermal performance of sandwich wall panels, heat transfer analysis was conducted by using the three-dimensional heat transfer simulation software. Four types of shear connector such as Pin, Clip, Grid, and Truss were selected for insulation performance analysis. Thermal bridge coefficient was calculated by varying typical panel thickness and shear connector thickness and materials such as steel, aluminum, and stainless steel. The results showed that Grid and Truss type widely distributed along the section of sandwich wall panel had a great influence on the thermal bridge coefficient by changing the influence factors. Based on the results of thermal and structural performance analysis, effective heat transmission coefficient of the sandwich wall panel satisfying the passive house insulation criteria was calculated. As a result, it was found that heat transmission coefficient was increased from $0.132W/m^2{\cdot}K$ to $0.141{\sim}0.306W/m^2{\cdot}K$ depending on the shear connector types and materials. In the majority of cases, the passive house insulation criteria was not satisfied after using shear connectors. The results of this study were likely to vary according to how influence factors were set, but it is important to apply the methods that reduce the thermal bridge when there would be a possibility of greatly affecting the insulation performance.

• 한국안전학회지
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• 제30권6호
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• pp.40-47
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• 2015

In this study, temperature characteristics and fire damage form were analyzed to investigate flame spreading form and fire probability from ignition sources subject to drivit component materials which is finishing material in architecture. Ignition sources were limited to a gas torch and exterior panel board fire, and the size of the sample was manufacture in 30 cm length ${\times}$ 50 cm height ${\times}$ 5cm thickness size. Marble (inner wall) + 3 mm drivit (outer wall), marble (inner wall) + 4 mm plaster stone (outer wall), sandwich panel + 3 mm driver bit (outer wall), sandwich panel + 3 mm driver bit + insulation (outer wall), and gypsum board (inner wall) + 3 mm drivit (outer wall) were prepared for the sample. As result of the research for temperature characteristics, large temperature difference by each material was shown in $218^{\circ}C{\sim}995^{\circ}C$ at 30 seconds and $501^{\circ}C{\sim}1078^{\circ}C$ at 300 seconds. Especially when the inner wall was a plaster board, lowest temperature of $501^{\circ}C$ was shown at 300 seconds and marble inner wall showed the following lowest temperature of $900^{\circ}C$. Temperature rising over $1000^{\circ}C$ was shown in other materials. Regarding fire damage form, drivit or gypsum board outer wall parts exposed to fire showed combustion and carbonization to show calcination(breaking phenomenon) and influence of heat exposure was higher as calcination became more severe.

• 한국재난정보학회 논문집
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• 제15권1호
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• pp.98-108
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• 2019

연구목적:본 연구는 화재 시 샌드위치패널 구조 창고의 벽 천장접합부 방호를 위한 스프링클러 성능확인 실험을 목적으로 한다. 연구방법: 현장조사결과를 기반으로 창고의 공간규격과 가연물을 선정하고 벽 코너 및 헤드 직하부에서의 방호실험을 수행하고 결과를 분석하였다. 연구결과:벽 코너 화재 시나리오에 대해서 K-80 폐쇄형 스프링클러헤드의 작동으로 샌드위치 패널의 착화 및 접합부 손상이 방지됨을 확인하였다. 결론:샌드위치패널 심재로의 착화 및 연소방지를 통한 화세제어로 이를 가정한 소방대의 소화 및 구조활동을 위한 표준진압대책이 마련되어야 한다.

• Steel and Composite Structures
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• 제51권1호
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• pp.53-61
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• 2024

Aluminum foams sandwich panel (AFSP) has been used in engineering field, where cyclic loading is used in most of the applications. In this paper, the fatigue life of AFSP prepared by the bonding method was investigated through a three-point bending test. The mathematical statistics method was used to analyze the influence of different plate thicknesses and core densities on the bending fatigue life. The macroscopic fatigue failure modes and damage mechanisms were observed by scanning electron microscopy (SEM). The results indicate that panel thickness and core layer density have a significant influence on the bending fatigue life of AFSP and their dispersion. The damage mechanism of fatigue failure to cells in aluminum foam is that the initial fatigue crack begins the cell wall, the thinnest position of the cell wall or the intersection of the cell wall and the cell ridge, where stress concentrations are more likely to occur. The fatigue failure of aluminum foam core usually starts from the semi-closed unit of the lower layer, and the fatigue crack propagates layer by layer along the direction of the maximum shear stress. The results can provide a reference for the practical engineering design and application of AFSP.

• The Journal of the Acoustical Society of Korea
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• 제28권1E호
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• pp.9-15
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• 2009

In this paper, FSTL (Field Sound Transmission Loss) measured in a mock-up simulating ship cabins is studied. A mock-up is built by using 6 mm steel plate, and two identical cabins are made where 25 mm or 50 mm sandwich panel is used to construct wall and ceiling inside the steel structure. Various wall panels and ceilings are tested, where effects of wall and ceiling panel thickness, and presence of a unit toilet on FSTL are investigated. It is found that the effect of unit toilet on FSTL is at most 1 dB. From the comparison of FSTL for panels of the same thickness of 50 mm, it is observed that panel having inside air cavity of 10 mm shows higher STL than that of the panel without air cavity. Comparison of FSTL for panels of 50 mm and 25 mm thickness shows that dependency on surface density predicted by mass law is not observed. The sandwich panels act as a mass-spring system, which shows a resonant mode that cannot be explained by the mass law. It is also found that STL from laboratory test is higher than FSTL by 5- 10 dB, which can be explained by flanking structure-borne noise transmission path such as ceiling, floor and corridor-facing wall.

• 한국재난정보학회 논문집
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• 제16권3호
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• pp.421-429
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• 2020

연구목적: 본 연구는 샌드위치패널 창고의 화재예방 및 현장소방대응력 제고를 위한 단계별 대응방안 제시를 목적으로 한다. 연구방법: 화재현장 관련 소방관 인터뷰와 소방전문가의 자문 및 방호성능 실험을 수행하여 현장대응력 강화를 위한 요소별 대책을 도출하였다. 연구결과: 창고 소방안전관리자용 화재안전관리 체크리스트 및 샌드위치패널 창고의 벽 방호용 스프링클러 설치기준을 제시하였다. 아울러 현장출동 소방관을 위한 샌드위치패널 창고 화재적용 표준작전절차를 수립하였다. 결론: 본 연구를 통하여 가연성 구조 창고의 화재 예방, 방호 및 진압에 대한 단계별 화재안전대책을 구축하였다.

• 콘크리트학회지
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• 제24권3호
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• pp.41-44
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• 2012