• Spatial Information Research
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• 제21권3호
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• pp.79-87
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• 2013

본 연구에서는 GIS기반에서 대용량 BIM 형상 객체를 효과적으로 표현하기 위한 경량 형상 포맷 구조 개발에 초점을 맞춘다. 최근 건물관리 유스케이스 관점에서 GIS기반에서 수많은 BIM 객체를 관리하고 필요한 정보를 표현하고자 하는 연구가 진행되고 있다. 이를 효과적으로 구현하기 위해서는 IFC와 같은 BIM정보표준모델을 도시차원에서 GIS상에 효과적으로 표현해야 한다. 이를 위해서는 BIM 정보를 포함한 경량화 된 BIM형상 가시화 방법과 포맷 구조를 제안하고 파일럿 테스트를 위해 프로토 타입을 구현해 본다. 파일럿 프로세스에서는 연구를 통해 도출된 설계 내용에 따라 3개 지역의 모델 데이터에 대해 일반적인 IFC파일과 경량BIM형상 포맷을 각각 구성한 후, 데이터 용량, 화면 로딩 시간 등의 성능을 비교하였다.

• Geomechanics and Engineering
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• 제31권6호
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• pp.573-582
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• 2022

The geometry of the gravity-type anchorage changes depends on various factors such as the installation location, ground type, and relationship with the upper structure. In particular, the anchorage geometry embedded in the ground is an important design factor because it affects the pull-out resistance of the anchorage. This study examined the effect of four parameters, related to anchorage geometry and embedded ground conditions, on the pull-out resistance in the gravity-type anchorage through two-dimensional finite element analysis, and presented a guide for major design variables. The four parameters include the 1) flight length of the stepped anchorage (m), 2) flight height of the stepped anchorage (n), 3) the anchorage heel height (b), and 4) the thickness of the soil (e). It was found that as the values of m increased and the values of n decreased, the pull-out resistance of the gravity-type anchorage increased. This trend is related to the size of the contact surface between the anchorage and the rock, and it was confirmed that the value of n, which has the largest change rate of the contact surface between the anchorage and the rock, has the greatest effect on the pull-out resistance of the anchorage. Additionally, the most effective design was achieved when the ratio of the step to the bottom of the anchorage (m) was greater than 0.7, and m was found to be an important factor in the pull-out resistance behavior of the anchorage.

• Wind and Structures
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• 제32권2호
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• pp.127-142
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• 2021

Wind load acting on a standalone structure is different from that acting on a similar structure which is surrounded by other structures in close proximity. The presence of other structures in the surrounding can change the wind flow regime around the principal structure and thus causing variation in wind loads compared to a standalone case. This variation on wind loads termed as interference effect depends on several factors like terrain category, geometry of the structure, orientation, wind incident angle, interfering distances etc., In the present study, a three building configuration is considered and the mean pressure coefficients on each face of principle building are determined in presence of two interfering buildings. Generally, wind loads on interfering buildings are determined from wind tunnel experiments. Computational fluid dynamic studies are being increasingly used to determine the wind loads recently. Whereas, wind tunnel tests are very expensive, the CFD simulation requires high computational cost and time. In this scenario, Artificial Neural Network (ANN) technique and Support Vector Regression (SVR) can be explored as alternative tools to study wind loads on structures. The present study uses these data-driven approaches to predict mean pressure coefficients on each face of principle building. Three typical arrangements of three building configuration viz. L shape, V shape and mirror of L shape arrangement are considered with varying interfering distances and wind incidence angles. Mean pressure coefficients (Cp mean) are predicted for 45 degrees wind incidence angle through ANN and SVR. Further, the critical faces of principal building, critical interfering distances and building arrangement which are more prone to wind loads are identified through this study. Among three types of building arrangements considered, a maximum of 3.9 times reduction in Cp mean values are noticed under Case B (V shape) building arrangement with 2.5B interfering distance. Effect of interfering distance and building arrangement on suction pressure on building faces has also been studied. Accordingly, Case C (mirror of L shape) building arrangement at a wind angle of 45º shows less suction pressure. Through this study, it was also observed that the increase of interfering distance may increase the suction pressure for all the cases of building configurations considered.

• 터널과지하공간
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• 제33권5호
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• pp.414-424
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• 2023

본 연구에서는 픽커터의 다양한 형상변수들과 그에 따른 절삭 가능 암반 조건들에 대한 총 326개의 정보를 수집하고 데이터베이스를 구축하였다. 이와 같이 구축한 데이터베이스를 대상으로 통계분석을 실시한 결과, 픽커터의 형상을 정의하는 변수들 사이에는 유의미한 양(+)의 상관관계가 존재하는 것으로 나타났다. 특히, 픽커터의 길이 관련 변수들과 텅스텐 카바이드 삽입재의 형상 변수들 사이의 상관관계가 높게 나타났다. 픽커터 샤프트의 직경도 삽입재의 형상변수들과 밀접한 상관관계를 나타내었다. 반면, 네 가지 조건으로 정의한 암반 조건에 대한 변수와 픽커터의 형상 변수들 사이에는 뚜렷한 상관관계를 확인하기 어려웠다. 이는 암반의 불확실성으로 인해 픽커터의 적용 대상을 수치가 아닌 적용 가능 범위로 제시했기 때문인 것으로 사료된다. 단, 암반이 강해질수록 픽커터 형상변수들의 평균값이 증가하는 경향을 나타내었다. 그러나 픽커터의 길이 관련 변수들은 암반이 강해질수록 오히려 작아지는 것으로 나타났는데, 이는 경암반에서 길이가 긴 픽커터를 사용할 때 발생할 수 있는 모멘트의 발생을 줄이기 위한 방안으로 사료된다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.165-168
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• 2007

A crack in concrete structure gives trouble to safety of building and human life. This study gives that development of auto extract system in a structure crack by digital image impersonal method for extract structure crack. This system will be possible to impersonal measurement for old concrete building and structure. For this auto extract system, used geometry of high resolution digital image and crack line extract by relation based image matching method. Now to conclude, this auto extract system gives a method that a quick measurement of building crack, hold objectivity in result, makes standardization for acquirement data, optimization result of measurement.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 추계 학술논문 발표대회
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• pp.175-176
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• 2015

Starting from Guggenheim Bilbao Museum in 1997, it has been increased steadily that complex geometry buildings using digital designs and construction process. Since 2010, the domestic Freeform design has been widely used for buildings such as Dongdaemoon Design Plaza, Seoul City Hall, Tri-Bowl, and etc. But there are many defects such as the increased cost and period of construction, and the declined quality of construction because of the lack of optimized method and engineering experiences. Therefore, this study has an effort to review case study of the recent freeform buildings and construction methods using digital fabrications. And this study proposed the improve method for the construction quality for freeform buildings.

• 국제초고층학회논문집
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• 제4권1호
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• pp.85-90
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• 2015

Advances in the technology of computational design are giving architects and engineers the opportunity to analyze buildings with complex geometries. This study explores the optimization and automation process using the parametric design method, and uses digital tools to achieve surface representation and panelization for curved shaped office buildings. In this paper, we propose parametric algorithms of dimensional and geometric constraints using the Knowledge-ware scripts embedded in Gehry Technologies' Digital Project. The knowledge-based design methods proposed in this study can be used to systemize the knowledge possessed by experts in the form of data. Such knowledge is required to promote collaboration between designers and engineers in the process of CAD/CAE/CAM. The aim of this study is to integrate the process into design, which establishes an integrated process. This integration enables two-way feedback between design and construction data by combining the methods used in designing, engineering, and construction.

• 국제초고층학회논문집
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• 제5권3호
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• pp.213-220
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• 2016

The "China Zun" tower in Beijing will rise to 528 meters in height and will be the tallest building in Beijing once built. Inspired by an ancient Chinese vessel, the "Zun", the plan dimensions reduce gradually from the bottom of the tower to the waist and then expand again as it rises to form an aesthetically beautiful and unique geometry. To satisfy the structural requirement for seismic and wind resistance, the structure is a dual system composed of a perimeter mega structure made of composite mega columns, mega braces, and belt trusses, and a reinforced-concrete core with steel plate-embedded walls. Advanced parametric design technology is applied to find the most efficient outer-perimeter structure system. The seismic design basically follows a mixed empirical and performance-based methodology that was verified by a shaking table test and other specimen lab tests. The tower is now half-way through its construction.

• Structural Monitoring and Maintenance
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• 제1권2호
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• pp.231-247
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• 2014

This paper focuses on the dynamic behaviour of Mirandola City Hall (a XV century Renaissance Palace) that was severely damaged during May 2012 Emilia earthquake in Northern Italy. Experimental investigations have been carried out on this monumental building. Firstly, detailed investigations have been carried out to identify the identification of the geometry of the main constructional parts as well as the mechanical features of the constituting materials of the palace. Then, Ambient Vibration Tests (AVT) have been applied, for the detection of the main dynamic features. Three output-only identification methods have been compared: (i) the Frequency Domain Decomposition, (ii) the Random Decrement (RD) and the (iii) Eigensystem Realization Algorithm (ERA). The modal parameters of the Palace were difficult to be identified due to the severe structural damage; however the two bending modes in the perpendicular directions were identified. The comparison of the three experimental techniques showed a good agreement confirming the reliability of the three identification methods.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제15권1호
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• pp.1-14
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• 2011

Logo has influenced many researchers and learners for the past decades as a 20 turtle geometry environment in the perspective of constructionism. Logo uses the metaphor of 'playing turtle' that is intrinsic, local and procedural. We, then, design an environment in which the metaphor of 'playing turtle' is applied to construct 3D objects, and we figure out ways to represent 3D objects in terms action symbols and 3D building blocks. For this purpose, design three kinds of representation systems, and asked students make various 3D artifacts using various representation systems. We briefly introduce the results of our investigation into students' cognitive burden when they use those representation systems, and discuss the future application measures and the design principles of Logo-based 3D microworld.