• Earthquakes and Structures
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• 제26권6호
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• pp.477-487
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• 2024

The interaction between multiple structures through the supporting soil media, known as structure-soil-structure interaction (SSSI), has become an increasingly important issue due to rapid urbanization. There is a need to investigate the effect of SSSI on the structural response of buildings compared to non-interaction analysis (NIA) and soil-structure interaction (SSI) analysis. In the present study, two identical 4-bay×4-bay, three-story RCC buildings are modeled adjacent to each other with a soil domain beneath it to investigate the effect of SSSI on the forces experienced by footings under gravity and seismic load cases. The ANSYS software is used for modeling various non-interaction and interaction models which work on the principle of FEM. The results indicate that in most of the footings, the SSSI effect causes a significant redistribution of forces compared to SSI and NIA under both gravity and seismic load cases. The maximum interaction effect is observed on the footings that are closer to the adjacent building. The axial force, shear force and bending moment values on these footings show that SSI causes a significant increase in these values compared to non-interaction analysis but the presence of adjacent building relieves these forces significantly.

• Wind and Structures
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• 제23권3호
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• pp.231-251
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• 2016

This paper presents the experimental results of the wind tunnel tests for three symmetric, rectangular, tall building models on a typical open terrain considering the torsional motion-induced vibrations. The time histories of the wind pressure on these models under different reduced wind speeds and torsional amplitudes are obtained through the multiple point synchronous scanning pressure technique. Thereafter, the characteristics of both the Root Mean Square (RMS) coefficients and the spectra of the base shear/torque in the along-wind, across-wind, and torsional directions, respectively, are discussed. The results show that the RMS coefficients of the base shear/torque vary in the three directions with both the reduced wind speeds and the torsional vibration amplitudes. The variation of the RMS coefficients in the along-wind direction results mainly from the change of the aerodynamic forces, but sometimes from aeroelastic effects induced by torsional vibration. However, the variations of the RMS coefficients in the across-wind and torsional directions are caused by more equal weights of both the aerodynamic forces and the aeroelastic effects. As such, for the typical tall buildings, the modification of the aerodynamic forces in the along-wind, across-wind, and torsional directions, respectively, and the aeroelastic effects in the across-wind and torsional directions should be considered. It is identified that the torsional vibration amplitudes and the reduced wind speeds are two significant parameters for the aerodynamic forces on the structures in the three directions.

• 한국콘텐츠학회논문지
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• 제19권7호
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• pp.291-303
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• 2019

고건축물이 위치한 도심지에게 있어 고건축물에 사용되는 야간조명의 문제는 도시의 역사와 문화를 나타내는 데에 있어서 매우 중요한 문제이다. 그러나 이러한 야간 조명의 시각적 평가는 여러 분야와 복합적으로 얽혀있다. 예컨대 고건축물 자체의 색채의 환원이라는 객관적 요소뿐만 아니라, 자연광과 인공광의 휘도대비나 조명시설기술의 영향과 같은 주관적 요소를 종합적으로 살펴보아야 한다. 본 연구는 고건축물 형태강화 계층, 시각적 해석 계층, 조명기술 응용 계층의 세 각도에서 야간 고건축물 경관의 평가체계를 구축하였고, 또 구체적으로 하위 항목들을 열거하여 서술하였다. 이를 바탕으로 계층 분석법(AHP)을 활용해 각 하위 항목이 전체 평가체계에서 차지하는 가중치를 분석하였다. 또한 일관성 검증을 시행해 본 연구가 도출한 평가체계가 단계 설정의 부분에 있어 요구되는 과학성과 합리성을 모두 갖고 있음을 검증하고자 하였다.

• 대한건축학회논문집:계획계
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• 제36권3호
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• pp.69-78
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• 2020

This study is designed to find out the role and relation of the Nemok-dori support members in order to clearly specify the structure of the Dapogye architecture which adopts the Nemok-dori. The dori at the eaves in the Dapogye architecture was expanded to include Oemok-dori, Jusim-dori and Nemok-dori in cooperation with the bracket. The Oemok-dori is used to lengthen the eaves and the Jusim-dori makes the reasonable transfer of loads while the Namok-dori contributes to the stability of the building through the balancing of the bracket. Nemok-dori is located higher than Oemok-dori or Jusim-dori, depending on the slope of Jangyeon and the distance of Chulmok. But as it is not directly supported by bracket or beam, it needs an independent support. The vertical support of Nemok-dori is selectively involved with Cheomcha, lower Jangyeo, support Wall and upper Jangyeo. As the time went by, the vertical height increased, thus making the omitted members less. The horizontal support of Nemok-dori is made in various ways. There are also special cases such as the Nemok-dori □ type chain structure for small rectangular buildings, the 'Nemok-dori = Jung-dori' type for the buildings having small sides and the 'Nemok-dori = Meongechangbang' type appearing on the lower part of the Bankanmulrim type middle height buildings. The horizontal support of Nemok-dori usually uses either the support of the Toeryang type member, the support of beam directed Hwaban or the support through overlaying of internal Jegong. As the time went by and the number and distance of Chulmok increased, the multiple support structures acted together rather than as one support structure. Nemok-dori got stabilized as it has both the vertical and horizontal supports and this support structure also has he role of decoration.

• Journal of Forest and Environmental Science
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• 제39권3호
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• pp.128-139
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• 2023

Urban forests serve multiple purposes by providing green resting spaces and environmental benefits for city residents. In the old city center, where parks are scarce, the campus of Kangwon National University, Chuncheon, Gangwon-do, South Korea, serves as an urban forest for students, faculty, and citizens. This study aims to quantitatively analyze the environmental functions of green spaces on campus, raising awareness about their importance among campus members. The total carbon storage of campus trees was estimated at 1,653,218 kg, including 1,512,586 kg in forest areas, 131,061 kg in planting spaces around buildings, and 9,571 kg in street spaces. The annual carbon uptake of campus trees was estimated to be 39,391 kg/year, with 30,144 kg/year in forest areas, 8,017 kg/year in planting spaces around buildings, and 1,230 kg/year in horizontal spaces. In addition, annual oxygen production was estimated to be 105,044 kg/year, with 80,385 kg/year in forest areas, 21,378 kg/year in planting spaces around buildings, and 3,281 kg/year in street spaces. Furthermore, we estimated carbon emissions from the use of on-campus facilities to be 4,856,182 kg/year, while oxygen consumption by members was estimated at 53,975 kg/year. However, the campus trees supplied a sufficient amount of oxygen, which was twice the amount required by school members. The carbon uptake amount was approximately 1% of the amount of carbon emissions, resulting in a modest contribution to improving the environmental conditions of the site.

• 한국건설관리학회논문집
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• 제4권4호
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• pp.123-136
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• 2003

아파트 공사에서 계획기성은 전체 사업단계에 걸쳐 공사기간 산정, 중도금 납부일정, 사업손익분석, 기성지급, 계획대비 실적비교 관리 등에 활용되므로, 다수 사업 참여자간의 이해와 사업의 성공에 지속적으로 영향을 미치는 핵심적인 관리요소이다. 그러나 대단지 아파트 공사에서는 다수건물 동시 시공으로 인한 공정 액티비티 과다발생으로 인하여 공정표를 작성하고 자원을 분개하여 계획기성을 정확하게 산출하는데 어려움을 겪고 있는 실정이다 본 연구에서는 실태조사를 통하여 기존의 문제점과 원인을 파악하고 계획기성 산출의 프로세스를 개선을 통하여 계획기성을 신속$\cdot$정확$\cdot$체계적으로 산출하기 위한 개선방향을 제시한다.

• Structural Engineering and Mechanics
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• 제63권4호
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• pp.537-549
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• 2017

One of the main concerns of civil engineering researchers is developing or modifying an energy dissipation system that can effectively control structural vibrations, and keep the structural response within tolerable limits during unpredictable events like earthquakes, wind and any kind of thrust load. This article proposes a new type of mass damper system for controlling wideband earthquake vibrations, called Multiple Wall Dampers (MWD). The basic principle of the Tuned Mass Damper (TMD) was used to design the proposed wall damper system. This passive energy dissipation system does not require additional mass for the damping system because the boundary wall mass of the building was used as a damper mass. The multi-mode approach was applied to determine the location and design parameters of the dampers. The dampers were installed based on the maximum amplitude of modes. To optimize the damper parameters, the multi-objective optimization Response Surface Methodology was used, with frequency response and maximum displacement as the objective functions. The obtained structural responses under different earthquake forces demonstrated that the MWD is one of the most capable tools for reducing the responses of multi-storied buildings, and this system can be practically used for new and existing building structures.

• 한국주거학회논문집
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• 제27권3호
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• pp.11-22
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• 2016

In Germany, during the modern architectural movements diverse experiments for the propagation of modern housing solutions were conducted that succeeded to the spirit of Bauhaus. Therefore, the study traced how Walter Gropius adopted the trends of architectural style and aesthetic, the concept of production, the concept for new typology of housing, and issues in urban architecture. According to the results, processes to the 'sachlich' style could be seen in the cases of early and latter works of detached houses and further aesthetic changes of later works. Second, Gropius expanded his design field from detached houses to multiple dwelling and it was accompanied by typological transformation of buildings considering the industrialization and production of housing. Third, in the cases of multiple dwelling, it could be identified that site planning of housing complexes and building arrangement reflected a shift from traditional urban pattern to new alternatives suitable for mass housing supply. Thus, changes in the genealogy and propensity of German residential designs were partly summed up and their implications on modern housing architecture were discussed.

• 한국주거학회논문집
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• 제22권3호
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• pp.101-111
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• 2011

This study was conducted to investigate the indiscriminate development occuring as a result of high-density land use per lot in residential areas of Seoul, which mainly consist of detached houses. The primary goals of this study were: (1) to suggest a block unit development method as an alternative architectural method of the current uniform development, in which high-rise and high-density apartments are usually built; and (2) to check the feasibility of the suggested method. Based on the analyses of the existing block composition types of residential areas, the prerequisite planning indices for applying a collective housing model were investigated. Subsequent to applying a collective housing type within each unit block, the collective housing model was analyzed. The results of the analyses showed that indiscriminate development was rampant in detached urban houses areas, and more than 70% of the buildings constructed before the 1980s needed re-development. The feasibility of the models was investigated depending on the models of low-rise and high-density collective housing, which utilize various block arrangements such as the court type, linear type, villa type, and composite type. The results of this study showed that the newly applied low-rise and highdensity multiple dwelling housing model in urban individual residential area significantly contributed to creating a good living environment in terms of both physical and psychological aspects.

• 한국건축시공학회지
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• 제8권5호
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• pp.67-73
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• 2008

Recent trends in construction towards larger scale and taller buildings are causing problems by ineffective existing management approach in construction industry have emerged. Delivering necessary materials and mobilizing the human resources and equipment In a timely manner to keep labor on schedule have become a critical issue to be addressed. In particular, many specialty contractors carrying out multiple projects have been experiencing difficulties mobilizing the manpower on time and in right places due to poor communication at each stage of labor supply, resulting in waste of valuable resources. Hence, it's imperative for the specialty contractors to obtain specific information on labor demand so as to set up a communication and labor management system to ensure the right human resources will be mobilized in the right place at the right time. The study therefore is aimed at developing an optimal human resources management system for specialty contractors performing multiple projects. To that end, the study is focused on rebar and concrete work. The outcome of the study is expected to help allocate the right human resources to the right place in a timely fashion, thereby achieving an effective workflow at construction sites.