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Year of publication
- 2004 (220) (remove)
This paper describes a couple of new truss structures based on fractal geometry. One is the famous Sierpinski Gasket and another is a fractal triangle derived by means of applying a process forming leaves of a cedar tree using M. F. Barnsley’s contraction mapping theory. Therefore a pair of x-y coordinates of an arbitrary nodal point on the structures are generated easily if IFS(Iterated Function System) codes and a scale of them are specified. Structural members are defined similarly. Thus data for frame analysis can be generated automatically, which is significant if the objective structure has complex configuration. Next analytical results under vertical and wind loadings in Japanese Building Code are shown. Here members are assumed to be timber and to have cross section of 15cm×15cm. Finally authors conclude that geometrically new truss structures were developed and automatic data generation for frame analysis was attained using IFS. Analytical results show they contribute to saving material when compared it with King-post truss.
Many problems related to data integration in AEC can be better tackled by an approach that takes into account the heterogeneity of tasks, models and applications but does not require continuous consistency of the evolving design data, at each data management operation. Such an approach must incorporate adequate services that can facilitate reintegration of concurrently modified data at reasonably selected coordination points. In this paper we present a set of methods which, used in combination, can achieve that goal. After a description of the principal envisaged cooperative work scenario each of these methods is discussed in detail and current observations drawn from their software realisation are given. Whilst the suggested approach is valid for any EXPRESS-based data model, the practical focus of work has been on facilitating IFC-driven integration.
As a result of the pilot-project “Grundwasser-Online” the supervision and the active controlling of large monitoring- and catchment-areas are realised by a co-operative integration of all related institutions, a synchronisation-process to combine all distributed data into one central server database, and a high-level eGovernment-Service to provide evaluated information over the internet. Based on this software system the local authorities are able to supervise the groundwater-levels and to find adequate decisions, which finally result in official permissions for the usage of groundwater-reservoirs by the water supply companies.
The highway product model based on the length information of the centerline, and the application system is developed. This paper shows the schema and the modeling process of the product model, which includes geometric elements such as an alignment, lanes, sidewalks, shoulders and sprits, and accessories such as guard fences, plantings and signs. Furthermore, The Highway Sequence Editor (HSE) is developed as an application system to verify the model.
This article discusses how the failures of construction projects could be prevented. The focus is on using IT tools in communication. The article is based on the findings of the PROLABproject. The project seeks to find solutions for how the information can effectively be used in project management, specially in construction projects, what kind of procedures help the management of the knowledge and how the obstacles for efficient ways of administrating the information can be removed. These obstacles can be either related to use of new technology or to organization culture. The paper discusses e-mail as a medium of communication with the media richness framework (Fulk & Boyd 1991) based on the interviews done with the participants of construction projects. We found out that the emails were used in both rich way and not so rich way. Obstacles of rich use of IT communication were partly technical and partly psychological. Technology acceptance model (TAM) is used to study the actual use of emails in communication. Obstacles of the use of emails were mostly individual differences like the skills to use the system or external variables like they did not have proper software to open the attachments. Also people talked about information overload. Emails often push too much information. Keywords: IT tools, Communication, Knowledge management, Construction
Organisational and human issues have been highlighted, among other issues (ICT infrastructures, legal and contractual, etc.), as key elements in enhancing the competitiveness of the construction sector. More specifically, the importance of human resources has been recognised, especially training and professional development, in order to cultivate a stable workforce. The paper provides a review of the key training needs for the construction sector with particular reference to the uptake and exploitation of new technologies and working practices, presents an action plan to address learning and training needs, and proposes an eight-stage iterative learning and training methodology. The results will be of particular interest to managers in stakeholder organisations of all sizes throughout the sector, plus academic and research bodies intending to continue construction ICT research.
In this research project we intend to transfer the whole AEC-Bidding process to an agent-based virtual marketplace. Hereby, the existing legal regulations have to be considered. Important aspects in developing the virtual marketplace are to provide the possibility to realize an agentbased bidding consortium as well as to integrate subcontractors.
This paper introduces the current development of electronic catalogues of construction products. The common system architecture of Web-based electronic products catalogues are discussed, followed by a discussion on construction products information standardization and latest distributed-systems technologies for communicating construction products information. Finally, this paper presents an implementation of Web service in e-commerce systems to enable sharing of construction products information.
Re-examination of the behaviour of structures can be necessary due to deterioration or changes in the traffic situation during their lifetime. The Finite Element Method (FEM) is widely used in order to accomplish numerical analysis. Considering the development of computer performance, more detailed FEM models can be analyzed, even on site, with mobile computers. To compensate the increasing amount of data needed for the model input, measures need to be taken to save time, by distributing the work. In order to provide consistency to the model, fedback data must be checked upon reception. A local wireless computer network of ultra-portable devices linked together with a computer can provide the coordination necessary for efficient parallel working. Based on a digital model consisting of all data gathered, structural modelling and numerical analysis are performed automatically. Thus, the user is released from the work that can be automatized and the time needed for the overall analysis of a structure is decreased.
Construction is a conservative industry that over the last twenty ye ars has experienced drastic changes in the way that interdisciplinary teams interact to design and execute a project. In this article we offer a general overview of how the main participants cooperate in the different phases of a construction project, and which are some of the main areas for communication improvement. We also explore the communication tools used in the exchange of information, and identify the main causes of information breakdown. The general framework of this study is of application to both standard and green projects. At the end of the article we discuss the peculiarities of green buildings. Our goal is to offer a series of industry insights derived from the perspective of a general contractor aimed at identifying the areas where contributions in computing and information exchange could have a greater impact on the successful completion of a project.