• Title/Summary/Keyword: industry foundation classes(IFC)

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Using Geometry based Anomaly Detection to check the Integrity of IFC classifications in BIM Models (기하정보 기반 이상탐지분석을 이용한 BIM 개별 부재 IFC 분류 무결성 검토에 관한 연구)

  • Koo, Bonsang;Shin, Byungjin
    • Journal of KIBIM
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    • v.7 no.1
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    • pp.18-27
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    • 2017
  • Although Industry Foundation Classes (IFC) provide standards for exchanging Building Information Modeling (BIM) data, authoring tools still require manual mapping between BIM entities and IFC classes. This leads to errors and omissions, which results in corrupted data exchanges that are unreliable and thus compromise the validity of IFC. This research explored precedent work by Krijnen and Tamke, who suggested ways to automate the mapping of IFC classes using a machine learning technique, namely anomaly detection. The technique incorporates geometric features of individual components to find outliers among entities in identical IFC classes. This research primarily focused on applying this approach on two architectural BIM models and determining its feasibility as well as limitations. Results indicated that the approach, while effective, misclassified outliers when an IFC class had several dissimilar entities. Another issue was the lack of entities for some specific IFC classes that prohibited the anomaly detection from comparing differences. Future research to improve these issues include the addition of geometric features, using novelty detection and the inclusion of a probabilistic graph model, to improve classification accuracy.

Civil Infrastructure Information Modeling Method Based on Extended IFC Entities using BIM Authoring Software (BIM 소프트웨어를 활용한 토목 시설물 IFC 확장요소기반의 정보모델링 방안)

  • Lee, Sang-Ho;Park, Sang I.;Kwon, Tae-Ho;Seo, Kyung-Wan
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.30 no.1
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    • pp.77-86
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    • 2017
  • Industry Foundation Classes(IFC) is the core product schema for ensuring the interoperability of information in Building Information Modeling(BIM) environment. However, since current IFC is mainly focused on building structure. there are limitations in the generation of functional information of components when applied to civil infrastructures. Previous studies have proposed IFC-based new entities for the civil infrastructures, it takes long time to support them in BIM authoring software packages. In this study, we proposed practical rules to apply IFC-based information modeling using BIM authoring software and additional new entities for the civil infrastructure through attributes and information mapping. The availabilities of proposed method were examined using the rail and sleeper information models based on an extended IFC data schema for the railway infrastructures.

IFC Model Data Retrieval and Regeneration Method through Property Set-based Query Language (IFC 속성 데이터기반의 질의어 개발을 통한 모델 정보 검색 및 재생성 방안)

  • Lee, Sang-Ho;Park, Sang I.;Jang, Young-Hoon;Choi, Kyou-Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.2
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    • pp.38-46
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    • 2017
  • In this study, a query language was developed to supplement the information retrieval and model regeneration in the case of Industry Foundation Classes (IFC)-based civil infrastructure information models. First, the IFC objects to represent the structural components, entities to manage the related properties, and relationships to connect with the mentioned elements were analyzed in a point of information flow. The results confirmed that the end-users could have problems with access and comprehend the properties and its relationships in the IFC file. Second, the IfcPropertySet-focused query method and applicable stand-alone module were proposed referring to the previous Building Information Model Query Language (BimQL). The availabilities of the proposed method were examined using the rail and sleeper information models through information retrieval and model regeneration. The most important advantage of the proposed approach is the IFC-based information retrievals that can guarantee the interoperability between software packages.

IFC-Based Computational Support Tool for Managing and Using Design Planning Information: Case Application and Evaluation

  • Seo, Jong-Cheol;Kim, In-Han
    • Architectural research
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    • v.13 no.2
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    • pp.3-12
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    • 2011
  • Planning information generated during initial architectural design phases significantly influences subsequent phases, and is implemented into architectural design models during the design process. However, failures to manage and use planning information in Korean design offices remain common. Current design tools that incorporate planning information also do not address the issue of interoperability during the life cycles of buildings. To address these problems, the Industry Foundation Classes (IFC) extension model was developed to accommodate the need to manage and use planning information for cooperation between design offices carrying out multidisciplinary tasks. This paper introduces a purpose-built software tool that implements the IFC model and demonstrates the efficiency of the proposed method with the software tool.

Development of Pre-Specification for BIM-based Automated Building Code Checking (BIM 기반 건축법규 자동검토를 위한 사전정의서 개발)

  • Kim, Inhan;Jang, Jaemoon;Choi, Jungsik
    • Korean Journal of Computational Design and Engineering
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    • v.21 no.1
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    • pp.31-41
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    • 2016
  • Building Information Modeling (BIM) has been adopted in variety domain of construction industry. In this circumstances, interest of BIM model quality has been increased. In many countries, automated building code checking system by Industry Foundation Classes (IFC) has been developed and studied to use web based building permission systems. IFC is international standard of BIM format. However, the data structure of IFC does not include all of objects and properties about national building codes. In this paper, we developed the information specification between IFC data structure and national building code to increase interoperability. First, we drew the criteria from literature review to analyze the building code. And then, we analyzed building code and sorted objects and properties for automated building code checking. After that we made mapping table between the sorted data and IFC specification. Using the mapping table, we developed pre-specification about building codes information that does not exist in IFC specification. And the defined information can be used to develop the BIM modeling guide and national building permission system. The pre-specification support increasing the interoperability between user and automated building code checking system. Increasing thee interoperability makes improvement accuracy and reliability about result of automated building code checking.

Mapping IFC to Object-oriented Relational Database (IFC의 객체기반 관계형 데이터베이스로의 매핑)

  • Kim, Seon-Woo;Lee, Ghang
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2007.11a
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    • pp.301-305
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    • 2007
  • Mapping of EXPRESS, which is object-favored language to represent IFC model, to Relational Database is not straightforward. Model size can be much bigger and data can be missed through process. However mapping to the object concept added database, such as Object Oriented Database or Object Relational Database, may be simpler and have lots of advantages. This study investigates previous IFC mapping studies, concept of Relational Database and Object Oriented Database, and mapping methodology to Object Relational Database using object.

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The Development Method of IFC Extension Elements using Work Breakdown Structure in River Fields (작업분류체계를 활용한 하천분야 IFC 확장 개발방안)

  • Won, Jisun;Shin, Jaeyoung;Moon, Hyoun-Seok;Ju, Ki-Beom
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.4
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    • pp.77-84
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    • 2018
  • As the application of BIM (Building Information Modeling) to the civil sector has become practical, and mandatory for road projects, the standardization, development of systems, etc. for the application and operation of BIM are required. In particular, it is important to develop BIM data standards for producing, sharing and managing the lifecycle data of civil facilities because they are commonly national public facilities. The BIM data standards have been developed by utilizing or extending IFC (Industry Foundation Classes), which is an international standard, but schema extensions of river facilities has not been developed thus far. This study proposes an approach to an IFC extension for river facilities using the WBS (Work Breakdown Structure) as a fundamental study for IFC-based schema extension in the river field. For this purpose, the research was carried out as follows. First, the IFC extension development method was selected to represent the river facilities by analyzing the existing IFC structure and previous research cases for the IFC extension. Second, extended elements of the river facilities were identified through an analysis of the WBS and classified according to the high-level structure of the IFC schema. Third, the classified elements were arranged based on the IFC hierarchy and the IFC schema extension for river facilities was established. Based on the suggested extension method of IFC schema, this study developed the schema by defining the element components and parts of river facilities, such as distribution flow elements and deriving their detailed types and properties.

Interoperability Tests of IFC Property Information for Open BIM based Quality Assurance (개방형 BIM 기반 품질검토를 위한 IFC 속성정보 호환성 테스트)

  • Choi, Jung-Sik;Kim, In-Han
    • Korean Journal of Computational Design and Engineering
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    • v.16 no.2
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    • pp.92-103
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    • 2011
  • The construction industry consists of various and massive architectural information as an architectural process includes a variety of design stages with cooperation of many disciplines. A Building Information Modeling (BIM) serves as a shared knowledge resource for information about a facility forming a reliable basis for decisions during its life-cycle from inception onward. building SMART has developed Industry Foundation Classes (IFC) standard for interoperability of BIM based information. Several software tools are already IFC-compliant. However, there are a lot of problems related to efficient interoperability of software owing to the lack of guide regarding the software usage and insufficiency IFC interfaces of software. The purpose of this study is to suggest efficient IFC support interface development methodologies of existing IFC certified software. The scope of this study is interoperability test for open BIM based quality assurance. To achieve this purpose, the authors have classified subject of open BIM based quality assurance and investigated IFC certification process and certified software. In addition, the authors have exported and imported via IFC files using different IFC interfaces in the software for interoperability of architectural objects and their properties. Finally, the authors have suggested IFC support interface development methodologies and hereafter direction for efficient interoperability of IFC certified software based on open BIM.

Development of Property Mapping Contents between Open BIM Data and Automated Code Checking System (개방형BIM 데이터와 법규 자동화 검토 시스템 간 속성 매핑 체계 개발)

  • Kim, Inhan;Bae, Jongyeon;Choi, Jungsik
    • Korean Journal of Computational Design and Engineering
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    • v.22 no.2
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    • pp.118-128
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    • 2017
  • Many countries have been developing BIM-based building code checking system and studies in the utilization of Industry Foundation Classes (IFC) in building code checking. IFC is the open standard of BIM format. Currently, there is a disadvantage that could not include all of the attribute for the regulations of each country and there is the problem with the interoperability of the different defined IFC approach between BIM software. This study focus on developing, derived object and property by comparing through domestic regulation and IFC2x3 specification provided by the buildingSMART and classified review type depending on the interoperability of derived information. According to classified review type, the IFC data structure was established and property mapping contents were developed by including BIM software compatible information and creating a type of review plan. When the developed property mapping contents are applied into BIM-based building code checking system, checking of the BIM data generated from various fields is made effective and thus improving the interoperability of information.

IFC Property Set-based Approach for Generating Semantic Information of Steel Box Girder Bridge Components (IFC Property Set을 활용한 강박스교 구성요소의 의미정보 생성)

  • Lee, Sang-Ho;Park, Sang Il;Park, Kun-Young
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.34 no.2
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    • pp.687-697
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    • 2014
  • This study ranges from planning phase to the detailed design phase of steel box girder bridge and proposes ways to generate semantic information of components through Industry Foundation Classes (IFC), a data model for Building Information Modeling (BIM). The classification of components of steel box girder bridge was performed to define information items required for identifying semantic information based on IFC, and spatial information items based on topology and physical information items based on functions of components were classified to create additional properties that does not support IFC by applying user-defined property set within the IFC framework. Steel box girder bridge information model based on IFC was implemented through BIM software and semantic information input interface, which was developed in this study to examine the effectiveness of the additionally created user-defined property. Furthermore, the quantity take-off of components was performed through information model of steel box girder bridge, and the applicability of the proposed method was tested by comparing the quantity take-off based on design document with the result.