• Structural Engineering and Mechanics
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• v.51 no.1
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• pp.141-162
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• 2014

The paper focuses on the dynamic response of a blast-invested glass-steel curtain wall supported by single-way pretensioned cables. In order to mitigate the critical components of the façade from severe structural damage, an innovative system able to absorb and dissipate part of the blast-induced stresses in the critical façade components is proposed. To improve the blast reliability of the studied glazing system, specifically, rigid-plastic and elastoplastic devices are introduced at the base and at the top of the vertical bearing cables. Several combinations and mechanical calibrations of these devices are numerically investigated and the most structurally and economically advantageous solution is identified. In conclusion, a simple analytical formulation totally derived from energetic considerations is also suggested for a preliminary estimation of the maximum dynamic effects in single-way cable-supported façades subjected to high-level blast loads.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.114-119
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• 2009

This study has been conducted to describe the establishment of national measures to reduce world energy consumption and $CO_2$ Emission. Particularly, Reductions in energy consumption from building operation is the most important part to achieve these national objectives. Element to evaluate the quantitative effects of these systems by having rationalized regulation and operation is essential, when planning for building energy reduction design. USGBC(US Green Building Council) have operated sustainable assessment method called LEED, which introduces baseline performance and evaluation direction for building simulation techniques. This research analyzed Quantitative assessments of the building energy consumption and analyzed baseline figures to provide comparative analysis with standard building settings.

• Korean Journal of Computational Design and Engineering
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• v.15 no.5
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• pp.393-402
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• 2010

Existing construction industry is composed of several processes with various characteristics. The tendency of current construction industry is getting complicated and diversified; it has limitation to solve problems through existing processes. As a problem-solving method, BIM (Building Information Modeling), environment to manage building life cycle from design and construction to management, is being suggested. Currently, BIM is only focused on technology development by engineers, and the automation of architectural theories is insufficiency except architectural design modeling. Therefore, this research aims to back up theses drawbacks through intellectual curtain wall arrangement by using musical proportions. In order to apply to construction automation, analysised of musical proportions method are performed. The BPMN-based Process Map is listed to develop IDM for the application to BIM Software.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.157-159
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• 2012

In recent years, the number of high-rise buildings has been on the rise. As buildings have become larger in scale, significantly different issues related to their construction and maintenance have emerged. In addition, the automation and mechanization of the cleaning work for the curtain wall, one of the most frequently-performed tasks in building maintenance, is required as a fundamental measure. For this reason, a guide-rail type cleaning robot system is emerging as one of the measures in response to external factors, including gust. The major objective of this study is to propose an economic feasibility forecasting model and to apply the a building facade cleaning robot which is now under development.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.04a
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• pp.357-360
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• 2011

고층 건축물에 주로 사용되는 커튼월의 경우 구조체와의 접합으로 인해 층간 틈새가 발생하게 되고 이는 화재 시 틈새를 통해 화염이나 연기 등의 확산 경로가 될 수 있다. 본 연구에서는 커튼월 시스템에 적용되는 선형조인트 내화충전시스템의 개발을 위해 경제적이고 시공이 간편한 박스형 시스템을 도입하고 내부에 다양한 변경하여 내화성능을 평가하였으며, 그 결과 케이싱 내부의 단열재 20mm두께의 내화 뿜칠재와 석고보드를 케이싱 안쪽에 박스 형태로 구성한 시스템이 가장 안정적이고 온도상승도 작은 것으로 나타났다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.163-167
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• 2010

최근 건축물의 초고층화에 따른 커튼월 시공에 따라 유리의 비중이 증가하고 있다. 커튼월 구조는 바람, 지진 등에 취약하며, 화재 안전성에 있어서도 취약할 것이라 판단되므로, 국내외 건축용 유리 및 커튼월의 안전기준에 대한 조사를 실시하였다. 그 결과 국내의 유리 기준은 단열 및 내풍압 성능에만 집중되어있으며, 화재 및 지진, 안전성능에 대한 기준이 미비하며, 커튼월에 대한 안전대책은 전무한 실정이다. 따라서 외국의 사례와 같이 초고층에서 커튼월의 안전성능을 고려한 설계프로세스나 안전 기준의 세부화가 필요하다고 판단된다.

• Proceedings of the SAREK Conference
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• 2008.06a
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• pp.1059-1064
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• 2008

The present study is to reduce the thermal phenomena and stack effect of nude elevator of the high-rise building used CFD simulation. Since many High-rise buildings used the curtain-wall glass, thermal phenomena and stack effect can easily occur at hot and cold season, respectively. The simulation has been conducted and verified for the effects of the amount of suppling air to the environment of the inside nude elevator shaft. The results of simulations show that the problems due to the thermal and stack effect will be reduced by enforced ventilation or natural ventilation and those will be presented by temperature and velocity profiles and pressure differences.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2001.04a
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• pp.414-421
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• 2001

Recently, the damping effect of building structures are greatly reduced because the use of non-structures members as like curtain wall are decreased and large open space are in need for the service of buildings. Assembly and office buildings with a lower natural frequency have a higher possibility of experiencing excessive vibration induced by human activities as like jumping, running and walking. These excessive vibration make the occupants uncomfortable and the serviceability deterioration. The common method of application of walking loads for the vibration analysis of structures subjected to walking loads is to inflict a series unit walking load and a periodic function at a node. But this method could not consider the moving effect of walking. In this study, natural frequency and damping ratio of plate structure are evaluated by heel drop tests. And new application of equivalent walking loads are introduced for vibration analysis of real slab system subjected to walking loads. The response obtained from the numerical analysis are compared well to the results measured by experimental tests. It is possible to efficiently analyze the vibration of floor which is subjected to walking loads by applying equivalent walking loads.

• International Journal of High-Rise Buildings
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• v.9 no.1
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• pp.17-41
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• 2020

In Part One, I documented the evolution of the use of the elevator and the iron frame to build ever-taller buildings that would eventually be called "skyscrapers," to offset the ever-increasing cost of Manhattan real estate. By the start of the Great Depression of the 1870s in 1873, New York architects had erected two ten-storied skyscrapers. In Part Two I document the major events, designers, and buildings in New York, Chicago, and other American cities that eventually culminated in the ability to erect 20 story skyscrapers by 1890.

• International Journal of High-Rise Buildings
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• v.9 no.1
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• pp.1-15
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• 2020

The evolution in the use of the elevator and the iron frame to build ever-taller buildings that would eventually be called "skyscrapers" is still somewhat shrouded in the mist of history. This two-part paper is an attempt to document the significant persons and events in that evolution, showing that these had a greater continuity than that previously recorded. In this first part, I discuss how the exploitation of the elevator in the design of buildings allowed "skyscrapers" to be built taller than the five-six story limit imposed by stairways, so that their owners could include more and more rental square footage needed to offset the increasing cost of Manhattan real estate. The use of iron framing for the interior framing in these taller buildings would reduce the amount of square footage lost to construction, thereby also increasing the rental return from the building. By the start of the Great Depression of the 1870s in 1873, New York architects had erected two ten-storied skyscrapers.