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Bjork B C, Lownertz K, Kiviniemi A

ISO 13567 - the proposed international standard for structuring layers in computer aided building design

Abstract: Layering is a widely used method for structuring data in CAD-models. During the last few years national standardisation organisations, professional association, user groups for particular CAD-systems, individual companies etc. have issued numerous standards and guidelines for the naming and structuring of layers in building design. Recently ISO has defined a draft international standard, ISO/DIS 13567, in order to increase interoperability betwen different CAD applications for building design.The principles which have been followed in the design of the draft standard are first presented, after which the paper describes the semantical organisation of the standard proposal and its default syntax. Important mandatory information categories deal with the party responsible for the information, the type of building element shown, and whether a layer contains the direct graphical description of a building part or additional information needed in an output drawing etc. Non-mandatory information categories facilitate the structuring of information in rebuilding projects, use of layers for spatial grouping in large multi-storey projects, and storing multiple representations intended for different drawing scales in the same model etc.Pilot testing of ISO 13567 is currently being carried out in a number of countries which have been involved in the definition of the standard. In the paper two implementations, which have been carried out independently in Sweden and Finland, are described. The paper concludes with a discussion of the possible benefits of the standard. Incremental development within the industry, is contrasted with the more idealistic scenario of building product models.

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Full text: content.pdf (442,818 bytes) (available to registered users only)

Series: w78:1996 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.standards (0.048516) class.synthesis (0.043906) class.represent (0.015610)
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Permission to reproduce these papers has been graciously provided by the University of Ljubljana. The assistance of the editor, Prof. Ziga Turk, is gratefully appreciated.


Lownertz K, Tarandi V

Cad components

Abstract: CAD Components is a Swedish research and development project, which was finished 1994. It has resulted in a recommendation for how suppliers and other companies shall formalise the digital description of their products. Instead of using CAD system drawings to distribute components the CAD Components are defined in a neutral ASCII file. The components can have both graphics and alphanumeric information. In addition to a 30 description there are isometric 20 views fined to store a number of levels of detailing, to be used in different drawing scales. To make it possible to use components from the early design phase all the way to the use of the completed building, the components can be easily replaced by more precise supplier specific versions. For this reason each class of components has to have definition points and default rotation. The classification of the CAD Components is based upon the Swedish BSAB system.

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Full text: content.pdf (967,412 bytes) (available to registered users only)

Series: w78:1994 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.impact (0.014627) class.synthesis (0.010084) class.software development (0.010008)
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Permission to reproduce these papers has been graciously provided by VTT, Espoo, Finland.


L÷wnertz, Kurt

Change and Exchange - Electronic Document Management in Building Design

Abstract: Producing documents using computer supported methods has become common practice in the construction industry, but the management of documents is still to a large degree done with manual methods. Some pioneering users in design, construction and facility management respectively have applied electronic document management (EDM) within their organisations or for projects. However, the introduction has hitherto been noticeably slow. This thesis discusses the benefits of the new document management techniques to the construction and facility management process, with focus on building design, as well as the obstacles when implementing these techniques. The construction sector process has some particular properties, differing from other industry sectors, in that a project organisation is formed anew for each project and involves a number of specialists with varying requirements for their company-internal production and management of documents. The main themes for EDM in building design are therefore how to manage the change of information and the exchange or sharing of information between the different organisations. The thesis contains a state-of-the-art description of document management in building design, including reviews of commercial applications, standards and current best practice. Basic techniques on a scale from file-hierarchy-based to product-model-based systems are classified and analysed from a building design perspective. Five cases of document management in practice have been studied. The companies studied are active within different design disciplines and have chosen to introduce and use EDM in different ways, with respect to technology as well as the information content that is managed. It is concluded that the different requirements can not be met by uniform methods for document management, but that the exchange of documents and their meta-data has to be supported by information standards which need to cover a number of levels from hardware to construction-specific classification. As a starting-point for further development a conceptual schema for document meta-data suited for building design is discussed. The overall result of the research provides requirements for specifying applications, standards and implementation procedures for electronic document management suited to the activities of building design and the interfaces to longterm information management concerning buildings.

Keywords: Document Management, Construction Process

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