• Korean Journal of Construction Engineering and Management
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• v.12 no.3
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• pp.11-21
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• 2011

The most critical issue in free-form buildings is how to construct the free-formed exterior facade panels. Their geometric complexity delivers many cons and problems in fabricating and constructing their shapes. To construct a free-form building, first of all, its skin has to be chopped into small pieces, which is called panelization. After panelization, the panels go through an optimization process to construct them economically. The panel's geometries are modified or regenerated through this optimization process. In this study, the panel optimization process of free-form buildings are performed through a case study. The panel shapes of the case study are modeled with Digital Project. To test the constructability of the various panels, 8 mock-up panels are made and laser scanning technology is applied to measure the preciseness of the panels manufactured in comparison with their original design.

• 발명특허
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• v.31 no.7 s.361
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• pp.66-68
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• 2006

건축을 하는데 있어 무엇보다 중요한 것은 정확한 설계, 시공 및 뛰어난 기술력이며, 각 부분 부분마다의 정확성과 뛰어난 기술이 어우러져 튼튼하고 아름다운 집이 탕생하게 되는 것이다. 이런 조건은 충족시키는 첫 번째 요소라 할 수 있는 국내 건축용 외장재 시장은 약 1조원대의 시장을 형성하고 있으며, 전체 건축비의 약 10%정도를 차지한다. 건축용 외장재 시장은 석재, 유리, 알루미늄, 아연도금철판의 기본 소재에 다양한 가공을 통하여 제품을 생산하고 있으며, 가공 및 시공의 편의성으로 인해 금속계 패널이 점진적으로 시장을 주도하고 있다. 금속계 패널은 크게 복합판넬과 sheet 패널시장으로 양분되며, sheet패널시장이 약 20%정도의 시장을 차지하고 있다. 해외의 경우, 유럽과 일본은 알루미늄계열의 패널과 미국은 철판계열의 패널이 시장을 주도하고 있다.

• Korean Journal of Construction Engineering and Management
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• v.15 no.4
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• pp.95-106
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• 2014

The outer surfaces of free form buildings contain panels with two-directional curvatures. To construct these panels, complex geometric surfaces should be divided into forms and sizes that can be manufactured and constructed efficiently. Because the bigger the curvatures of these panel, the more expensive the construction costs, these complex curvatures should go through optimal process of reinterpretation to minimize the curved surfaces with complex two-directional curvatures, which is called panel optimization. Small construction and design companies have trouble in calculating even rough estimate and cannot adjust expected construction cost of the panels based on comparison of design alternatives in conjunction with panel optimization process due to lack of knowledge and experience. This study conducts the research that can support designers' cost decision-making in the design stage of the free form buildings with respect to the panel optimization process. A 3D commercial application specialized to modeling free form shapes is used for the purpose.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.5
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• pp.830-835
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• 2012

A research for application of LDSMC(Low Density Sheet Molding Compound) composite is in progress for lightening the weight. This paper has performed fatigue test and simulation of external panel for Korean commercial vehicle. Before the fatigue test, static test was carried out. From the test, the structural safety was investigated using Goodman diagram. After the static test performance, the fatigue test was conducted at a range of load frequency 5Hz, a stress ratio(R) of 0.05 and an endurance limit of $10^6$ to obtain the S-N curve. The S-N curve is applied to the fatigue analysis of the external panel assembly. The result of FEM analysis was in accord with the experimental result within 83% confidence. It showed that the process to set up the safety range of allowable error is required in process of the design and simulation verification.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.187-188
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• 2021

In the case of the Busan North Port, where the Busan Opera House is located, it is an environment exposed to various external deterioration factors such as frequent strong winds, seawater and salty winds, and an exterior material using UHPC (Ultra High Performance Concrete), a highly durable exterior material as a solution to this. Has been adopted. in this study, an economical production and construction direction was reviewed by applying UHPC to the exterior panels of atypical buildings that cannot cope with GFRC, metal, and glass, which are the main exterior finishing materials applied so far. When steel fibers are used, structural performance may be better than organic fibers, but due to environmental factors in Busan, corrosion due to exposure to steel fibers or problems with safety management after construction and completion may occur. Therefore, the site used the newly developed SACF fiber. Facade design of atypical buildings, which will increase in the future, is an important part, and the scope of use of UHPC panels is expected to increase in the future as design trends and demand for high durability increase.

• Journal of Korean Association for Spatial Structures
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• v.23 no.4
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• pp.4-9
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• 2023

• Proceedings of the KAIS Fall Conference
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• 2007.11a
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• pp.308-311
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• 2007

본 연구에서 개발할 설계기술은 부가가치가 매우 높은 소량 다품종 건축용 내 외장재의 금속 패널코너가공법에 관한 것이다. 금속 금구류 및 건축용 내 외장재로 사용되는 2.5mm이상 되는 금속강판을 사용함에 있어서 가장 문제가 되는 직각코너링 접합부위에서 발생되는 내식성(수명성), 내후성, 및 미려성(디자인)을 향상시키므로 품질의 향상뿐만 아니라 소량 다품종의 생산성을 증대시킬 수 있는 국내 최초 금속패널 코너가공을 할 수 있는 벤딩다이시스템(Bending Die System)을 설계하고자 한다.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.293-295
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• 2008

본 연구에서 개발할 설계기술은 부가가치가 매우 높은 소량 다품종 건축용 내 외장재의 금속 패널 코너가공법에 관한 것이다. 금속 금구류 및 건축용 내 외장재로 사용되는 2.5mm이상 되는 금속강판을 사용함에 있어서 가장 문제가 되는 직각코너링 접합부위에서 발생되는 내식성(수명성), 내후성, 및 미려성(디자인)을 향상시키므로 품질의 향상뿐만 아니라 소량 다품종의 생산성을 증대시킬 수 있는 국내 최초 금속패널 코너가공을 할 수 있는 벤딩다이시스템(Bending Die System)를 설계, 제작하여 경제적, 기술적으로 고부가가치를 창출하여 수출증대에 기여할 수 있다.

• Fire Science and Engineering
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• v.24 no.2
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• pp.89-96
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• 2010

In this research, exterior material combustion experiment was really tested to evaluate fire risks of aluminium complex panel which is used a lot for building exterior material. As a result, We saw fast fire spreading of aluminium complex panel. The reason is polyethylene in aluminum complex panel combust spreading fast fire flame vertically. In this test, the highest heat release rate of aluminum complex panel was 1,144 kW and surface temperature which is measured by thermocouple went up to more than $903.3^{\circ}C$, that temperature is quite a higher than $660^{\circ}C$ which is aluminum melting temperature. So, fire of aluminum complex panel can be evaluated to give us severe damage both by fast fire spreading vertically and by fire spreading through openings internally. These results from real experiment will be able to use to predict fire spreading of aluminum complex panel by comparing to modeling materialization of aluminum complex panel in the future.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.04a
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• pp.176-177
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• 2022

In this study, surface performance evaluation was conducted according to the fiber and surface finishing technique of the exterior material using Ultra High Performance Concrete(UHPC), whitch is spotlighted as a highly durable exterior material. As a result of outdoor exposure, the initial performance of the UHPC Panel using organic fibers was maintained without being affected by the surface finishing technique. In the specimen using steel fiber, the surface performance was maintained when the water repellent treatment was performed in the plain specimen, but fiber corrosion occurred in the specimen to which the surface finishing technique was applied.