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Debras P

Construction application of a gen-network : uniform access to standards, products and company information

Abstract: "Facing an increasing competitive environment where flexibility and adaptability to change are the obliged route to success, building and construction companies have to continuously renew their working habits while keeping business processes under quality, time and cost control. In the Architecture, Engineering and Construction (AEC) domain, the wide diversity in terms of the object built, but also associated to the geographical dispersion of actors and building sites makes such an agility even more crucial. Considering the design and tendering phase of a construction operation, the architects and construction engineers have to efficiently select the manufactured products that will best suit the project while complying to its numerous constraints. Beyond the functionality, performance and cost characteristics, a suitable product has also to conform to the applying regulations and standards, be eventually accompanied with a corresponding technical agreement, offer acceptable delivery solutions on the building site. Moreover, once identified within a manufacturer catalogue, the product has to be integrated into the architect or engineer application desktop, whether it be a CAD, specification writer or quantity take-off application. Addressing these needs, the Global Engineering Networking (GEN) initiative is promoting the reuse of company internal and external engineering knowledge through the emergence of new kind of global market places where actors publish and retrieve on-line a wide range of engineering information and services. In particular, The Construction Pilot in EP 22 284 GENIAL project demonstrates over the AEC domain, the relevance of new generation of Information Technology infrastructures supporting the erection of Value-Added Service Provider (VASP) sites that materialise the GEN vision, i.e. allowing information and services to smoothly be retrieved where required whilst the succeeding company is concentrating on its core competencies. With such an infrastructure, whether it is through material, performances, manufacturer, regulation or price discrimination, the appropriate component, document or service is rapidly and cost effectively brought on the designer desk for the best value of the overall project. On the other side of the communication pipe, the supplying partner gains the opportunity of reaching an enlarged audience as IT now commonly break any geographical distance. In practice, three major information publishers and a building contractor in Europe initiate the GEN network in the AEC domain through the erection of VASP sites offering product, company or document related information. User queries are governed by various standard (EPIC, UNICLASS) or corpus specific (BATIBASE, EDIBATEC) classification systems. Relevance of the overall approach is demonstrated through the presentation of a large variety of such queries for the various information corpuses used : Techcom company and product information, BIC company, product and document, REEF regulation documentary corpus or EDIBATEC product information."

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Full text: content.pdf (748,881 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.legal (0.032376) class.retrieve (0.019963) class.roadmaps (0.012591)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Delcambre, B.

Towards an Integrated CAD for Building Projects

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Series: w78:1986 (browse)
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Doulis, Mario; Vogel, Manfred; Pfluger, Jan; Rietmann, Marco; and Raps, Michael

4Dive - A 4D Interface for the Visualization of Construction Processes in a Virtual Environment

Abstract: In this paper we present 4DIVE, an interface concept for the visualization of construction processes in Virtual Reality (VR). It supports process management tasks of the AEC industry in the field of Virtual Design and Construction (VDC). 4DIVE is developed for the use in projection based Virtual Environments (VEs) like the CAVE or large scale projection walls, supporting stereoscopic visualization in real-time and 3D user tracking. The 4DIVE project focuses on the design of interaction concepts addressing the following topics: (1) The integration and visualization of 4D CAD models in VR systems, (2) the development of 4Record, a tool for recording and replaying paths in the 4D time-space, and (3) the design of suitable input devices and interaction techniques.

Keywords: Virtual Reality, 3D User Interface Design, 4D Technology, 4D Building Models, Input Devices

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Full text: content.pdf (302,962 bytes) (available to registered users only)

Series: convr:2007 (browse)
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Drogemuller R M, Smith J

Integrating the building procurement process using knowledge based technology

Abstract: Computer based methods for facilitating building procurement have been proposed for over twenty years, but progress on such systems has been slow. This paper describes a project built around a three dimensional computer model of the building to be constructed, Knowledge based techniques are used to build up the level of detail required at each stage of development. Data entry requirements are minimised since only the information unique to the project need be entered. Standard information is stored as default values from previous similar projects. The user interface is simple, with a combination of menus to control the flow of information and dialogues to enter textual information. An ‘intelligent’ CAD interface is used to enter the building geometry. The system has been developed around the design and construction of detached houses, but the principles demonstrated are relevant across the standard building types. In its current form the user can access the geometric and spatial parameters of the building, derive costing data and perform thermal analyses. There is an option to export scheduling information to an eaernal CPM program. This furnishes the basis for planning the construction activities. The flexibility of the system indicates that knowledge based systems are a viable technology for assisting construction management.

Keywords: knowledge based systems; knowledge based estimating; multi-expert system; geometric reasoning; Prolog

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Full text: content.pdf (594,574 bytes) (available to registered users only)

Series: w78:1993 (browse)
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Permission to reproduce these papers has been graciously provided by the National University of Singapore. The assistance of the editors, particularly Prof. Martin Betts, is gratefully appreciated.


Drogemuller R, Ambrose M, Tucker S

Automating building life cycle energy assesment

Abstract: Building designers and developers are expected to meet an increasing range of constraints on building projects. Normally, the new constraints are part of an established body of knowledge which designers either have to learn or a new "discipline" emerges which has expertise in the new area. While the stock of buildings is improved through these new requirements, both of these paths increase the complexity of the design process with consequent increases in time and cost for the project. LICHEE is an advanced prototype of a system that integrates CAD with life cycle energy assessment. With the addition of some extra information, it automatically estimates the operational energy and embodied energy requirements of detached housing The system was built out of existing components using the Industry Foundation Classes (IFCs) as the "glue" to bind the components together. The use of the IFCs provided significant savings in development time over writing interfaces against the major CAD systems. The software architecture chosen allowed the use of existing stand-alone software components that previously required extra expertise and time.

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Full text: content.pdf (728,119 bytes) (available to registered users only)

Series: w78:2002 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.economic (0.031156) class.deployment (0.021878) class.social (0.021374)
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.


Duarte J P

Introducing cam technologies in pavicentro housing production system

Abstract: Pavicentro is a Portuguese factory that mass produces prefabricated houses based on a concrete box system. Among the goals that directed the development of this system were concerns for quality and customized production. Nevertheless, while quality improved, the initial concern for customization soon faded into common mass production. The paper points out the opportunity provided by CAD/CAM technologies to develop a truly customized mass production process. Such a process would extend design diversity and enhance design quality, thus increasing customer satisfaction. The paper identifies areas of production with a greater potential for the introduction of CADICAM, which are related to the production of secondary elements, including precastconcrete and nonconcrete elements.

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

Series: ecce:1997 (browse)
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Dyson M

Design and construction: What are they?

Abstract: How can we communicate design knowledge in construction? Models convey information and are sourced from a greater process of design. Seeing a latent potential for knowledge-implementation in modelling as design process reengineering, a basis is first required for representing the design to construction process as modelling. What is design and construction in this context? How can we 'read' the modelling process in practice before improving it? This paper discusses some research related issues for constructing a description of what we do in practice to answer some of these questions. This approach is the core of a PhD project within CID working with the idea of concept-framed object transformations based on the formalisation of practice-related CAD-methods.

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Full text: content.pdf (83,884 bytes) (available to registered users only)

Series: w78:2002 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.strategies (0.060817) class.communication (0.024561) class.collaboration (0.010383)
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.


E Collins

Experience in CAD 1976 - 1984

Abstract: During 1976 a building modelling system (RUCAPS), developed in the UK, was used by an architectural practice to assist in preliminary design, detailed design, and contract documentation for a major Middle East University. This system was used extensively for architectural input and it was accepted that backgrounds in plot form would be issued to the other consultants concerned, none of whom operated CAD facilities and were all based in the USA.

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Full text: content.pdf (767,269 bytes) (available to registered users only)

Series: w78:1984 (browse)
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E Santos, E Toledo Santos

Design Coordination with Building Information Modelling – BIM: A Case Study

Abstract: Despite some isolated initiatives using 3D CAD or BIM (Building Information Modeling) tools, project processes in the Brazilian AEC industry are still essentially developed using 2D technology, especially in the design development phases. There is evidence in the literature that 2D representations are prone to difficult-to-detect design errors and representation mistakes. BIM is an emerging paradigm based on object oriented, parameterized 3D CAD tools that promises an even better performance in design coordination processes than standard 3D CAD. This work aims to identify the potential for using BIM tools in the design coordination process as a more effective alternative to two-dimensional methods (abstraction and overlaying of drawings for interference checks and clash detection among different design disciplines). The research was based on the execution of a case study involving a complex residential building. Its design was developed as usual, with 2D CAD, as was its coordination process, by professional firms hired by the owner. Afterwards, using the same documents provided to the coordination firm, the first author independently developed the architectural, structural, plumbing, and HVAC BIM models for the standard floor plan of the building, simulating both the Schematic Design (SD) and the Design Development (DD) phases. During and after this process, detected interferences and information errors or omissions were documented in order to be compared with those reported in the traditional process of design coordination. The comparative analysis of both reports in this case study showed that the methodology with BIM detected 75% more design interferences and inconsistencies than the 2D-CAD supported method. This was partly due to the easier visualization of the virtual model, and to the software features for automating interference checks. On the other hand, the analysis of the interferences found in both processes demonstrated that the modeling procedure alone can affect design perception and evaluation, allowing the detection of a greater number of incompatibilities during the process.

Keywords: Design Coordination, BIM, Clash Detection, Case study

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Full text: content.pdf (458,394 bytes) (available to registered users only)

Series: w78:2011 (browse)
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Earl M

A design automation paradox

Abstract: There seems to be a 'tyranny' of predefined purpose in some highly automated CAD products. For example, a CAD product for architects may provide 'high level" commands for trimming 'walls'. However, unless the 'wall' types conform to a particular topology, they can not be trimmed. On the other hand , there are 'low level' commands which can be used to trim more general types of graphic entities. However, unless the graphic entities are tediously decomposed into primitive elements, such as line segments and arcs, they also can not be trimmed. A paradox of design automation is that adding higher level functionality to a CAD product bounds its use within a specific design modeling domain and restricts its use from other more general domains. On the other hand, more general CAD products are flexible at a primitive level, but can not be used to provide 'high level' functionality. Although design specific knowledge within a CAD product may prove to be a great utility in some instances, it is typically paid for in terms of pre-conceived constraints on modeling. Artificial Intelligence techniques may provide a way of offering high level functionality with less pre-conceived constraints; however, it may be fallacious to assume that o particular modeling domain will not be Imposed on the user. This paper illustrates how a modeling domain is typically defined with a commercial CAD product . It takes notice of how the assumptions underlying any particular modeling domain may be challenged by design theory. It then cautiously explores a scenario for how the need for a modeling domain may be reconciled in a "thousand flowers bloom" approach.

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Full text: content.pdf (3,047,902 bytes) (available to registered users only)

Series: w78:1988 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.synthesis (0.021123) class.analysis (0.008794) class.man-software (0.003701)
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Permission to reproduce these documents has been graciously provided by the Lund University and the Swedish Building Centre. The assistance of the editors, Prof. Per Christiansson and Prof. Henry Karlsson, is gratefully appreciated.


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