• 한국건축시공학회지
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• 제4권3호
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• pp.109-116
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• 2004

Normally easy task of plat in urban architecture is that using underground full of activities for increase building site efficiency. Especially for using underground space for the parking lot. Also utilize underground is more increase for fulfill requirement in modern society considered with environmental friendly architecture. The primary objective of this study is to apply analyzed formal foundation type for selecting the optimum type of parking lots considered with structural stability, economical efficiency, construction efficiency, construction duration. This study aim to on criteria decided through the questionaries for the selection considered with in the scale of second stories parking lots underground, parking volume is 80 and reinforced concrete structure. The bearing capacity is 6～8m and downward from surface, healthy ground bearing capacity is 40 t/m2. This study comparative analysis and discuss economical efficiency, construction efficiency, construction duration based constructivist stability which applied Single foundation, Mat foundation, Drop Mat foundation. The result of this study is as follows: First, the result of economical efficiency is that on the basis of single foundation, Drop Mat foundation is 1.88, Mat foundation 2.04 as a comparative analysis on the basis of total construction cost included material cost, labor coast and machinery cost. Second, the result of construction efficiency order is single foundation, Drop Mat foundation, Mat foundation as a comparative analysis on the based connected characteristics. Third, the result of construction duration is that on the basis of Mat Foundation, Drop Mat foundation is 1.33, single foundation is 1.87 as a comparative analysis Critical Path. Forth, Each foundational type characteristics order through the matrix method is that overall each formal type of foundation contraries at economical efficiency and construction efficiency, construction duration. Also expect contradiction between engineers and owners due to engineer pursuit construction duration and ewer to begin with economical efficiency. Fifth, The selection of suitable foundation formal type needs that based consider project characteristic and field condition as according to above result of a comparative analysis. As a result, a comparative analysis economical efficiency, construction efficiency, construction duration of Mat foundation, Drop Mat foundation, single foundation with 3Bay reinforced structure underground parking lots on the healthy ground.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문 발표회
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• pp.1-4
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• 2003

Recently, a structure has been larger and higher under the improvement of construction technique. So, a concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, because of the reason high strength concrete, the matter of thermal crack have become an important task to be solved absolutely. In a cause a thermal crack occurrence, there used, mixture of concrete, construction and so forth. In this study, we executed temperature and stress analysis of mat foundation to know the effect the construction condition a thermal crack of mat foundation. And we evaluated quantitatively about the occurrence possibility of thermal crack using the hydration heat analysis program. By using of this analysis technique, will can control skilfully the quality of a mat foundation in advance.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.1-4
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• 2003

Recently, a structure has been larger and higher under the improvement of construction technique. So, a mass concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, because of the reason of high strength of concrete, the matter of thermal crack have become an important task to be solved absolutely. tn a cause of a thermal crack occurrence, there are material used, mixture of concrete, construction condition and so forth. In this study, we executed temperature and stress analysis of mat foundation to know the effect of the construction condition on a thermal crack of mat foundation. And we evaluated quantitatively about the occurrence possibility of thermal crack using the hydration heat analysis program. By using of this analysis technique, we will can control skilfully the quality of a mat foundation in advance.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.305-308
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• 2003

Recently, a structure has been large and high under the improvement of construction technique. So, mass concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, in the reason of high strength of concrete, a matter of thermal crack became an important task to be solved. In this study, we executed temperature and stress analysis of mat foundation. And we evaluated quantitatively about the possibility of thermal crack by using hydration heat analysis program. Because of this analysis technique, we could control skilfully the quality of mat foundation in a construction.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1994년도 가을 학술발표회 논문집
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• pp.94-110
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• 1994

Types of foundation of high rise buildings are primarily determined by loads transmitted from super structure, soil bearing capacity and available construction technology. The usd of deep foundation cannot be justified due to the fact that rock of enough bearing capacity is not found down until 90 ~ 100m. When a concentration of high soil pressure must be distributed over the entire building area, when small soft soil areas must be bridged, and when compressible strata are located at a shallow depth, mat foundation may be useful in order to have settlement and differential settlement of variable soils be minimized. The concept of mat foundation will also demonstrate some difficulities of applications if the load bearing demand directly carried down to the load -bearing strata exceeds the load -bearing capacity. This paper introduces both the analysis and design of mat type foundation for high rise buildings as well as the methodology of modelling of the soil foundation, especially, engineered to redistribute the stress exceeding the soil bearing capadity. This process will result in the wid spread of stresses over the entire building foundation.

• 한국건축시공학회지
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• 제17권1호
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• pp.63-72
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• 2017

태양 복사가 콘크리트 매트기초 내부 온도 분포에 미치는 영향에 대한 해석적 연구를 수행하였다. 태양복사량 산정을 위해 Zhang and Huang 모델을 사용하였다. 열전달 방정식과 Galerkin 방법을 이용하여 1차원 열전달 유한 요소 정식화를 수행하였으며, MATLAB을 사용하여 유한요소 해석코드를 작성하였다. 작성된 해석코드를 바탕으로 태양복사를 고려한 콘크리트 매트기초의 수화열 해석을 수행하였다. 해석결과, 태양복사가 매트기초 내부-표면부 최대온도차를 줄여주는 효과를 보임을 확인하였다. 또한 이러한 효과는 하절기 타설시, 콘크리트 초기온도가 클수록, 그리고 매트기초의 두께가 두꺼울수록 더욱 뚜렷해짐을 확인 하였다. 본 연구는 콘크리트 매트기초의 수화열 해석시 해석결과의 과대평가를 피하기 위해서 태양 복사의 영향을 고려해야 함을 권고한다.

• 한국콘텐츠학회논문지
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• 제12권8호
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• pp.366-372
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• 2012

매트기초 건설공사를 포함한 대부분의 건설공사에서 구조물 가설 초기단계에서의 안전사고 방지는 매우 중요한 요소이다. 안전사고의 위험성을 감소시키기 위하여서는 콘크리트 타설 이후 안전한 거푸집 작업과 적절한 양생의 종류를 선택하는 양생방법의 선정이 무엇보다도 중요하다. 이에 따라 본 논문은 비정상상태의 수화열 해법을 통하여 매트기초 건설을 위한 적절한 양생방법 및 양생시기를 선정하는 알고리즘을 개발하였다. 이를 위하여 균열지수에 주안점을 둔 구조해석 시스템을 통한 사용자 중심의 OOP 루틴을 적용하였다. 이에 따라 콘크리트 가설 초기의 거푸집 공사에 따른 위험요소를 미연에 방지할 수 있는 안전한 양생방법 선정이 시스템적으로 가능하게 된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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• pp.807-812
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• 2001

This study is peformed for checking the limitation and application of each curing/heating methods on cold-weathering mat foundation construction, considering temperature control, early strength security and temperature declination range limit, by means of concrete material properties and thermal analysis technique that were published previously. In the result of this analysis, we checked the open air temperature and mat depth that are possible to apply each curing/heating methods on cold-weathering construction and found curing/heating time of each methods that is able to prevent early aged freezing damage and thermal crack

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2010년도 춘계 학술논문 발표대회 1부
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• pp.17-19
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• 2010

This paper describes the possibility of the raft thickness reduction for mega foundations system of super high-rise buildings through a case study on domestic and foreign super high-rise buildings. In case of super high-rise buildings, the size of foundations, especially raft becomes wider and deeper because of heavy upper load. It is difficult to pour concrete of this kind of mega foundation, and cracks by hydration heat could happen. Therefore, there are several ways to reduce the raft thickness of mega foundations. Piled-raft could be the one because moment and shear load that the raft subjects on by soil reaction are lower. The effect of the piled-raft foundation on the raft thickness reduction could be confirmed by comparison of super high-rise buildings with pile, piled-raft and mat foundation. Furthermore, it was showed that the raft thickness could be more reduced by locating piles right under the vertical members of super structures.

• 한국지반공학회지:지반
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• 제11권2호
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• pp.51-70
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• 1995

초고층 건물의 기초는 지반의 지지력, 경제성, 시공성 등이 고려되어 먼저 그 형태가 결정되게 된다. 이 논문에서 고려된 빌딩에서의 깊은 기초의 적용은 심도90~l00m까지 암반의 충분한 지내력이 확보되고 있지 않은데 기인한 것이다. 지반의 지지력이 전반적으로 그다지 크지 않으면서 상부 구조물이 어느 특정기등에 상당한 축력을 미치게 되는 경우 이곳에는 상대적으로 많은 침하가 예상되게 된다. 이러한 경우 전면기초(MAT기초)로 처리하면 지반에 미치는 큰 응력을 주위 지반으로 분산시켜 경제적이며 바람직한 설계가 가능하여 진다. 이때 약한 부분의 지반은 전면기초를 통하여 지지력의 여유가 있는 지반과 연결되게 되므로 전면기초가 이와 같은 휨모멘트나 전단력등을 전달할 수 있도록 설계된다면 기초의 부등침하를 방지할 수 있게되어 상부 구조물을 부등침하로 부터 안전하게 보존할 수 있게 된다. 본 논문은 이와같이 실제 계획, 설계중인 초고층 건물의 순수전면기초 해석 및 설계로서 일반 실무에도 연결될 수 있는 설계기법과 하중이 지반의 지내력을 초과하는 경우 응력의 재분배를 고려한 모델링 기법을 소개하고자 한다.