A current trend in the construction sector is the application of Building Information Modeling (BIM) for the efficient integration and management of engineering information. Today, engineering consultant, construction and architectural companies conduct research into the development of BIM in order to integrate and visualize engineering information. The capabilities of BIM for information integration, visualization and parametric design, reduce duplication of work and interface integration complexity, significantly saving both time and cost. At present, BIM desktop applications such as Autodesk Architecture, Bentley Architecture and Graphsoft ArchiCAD, can only integrate and visualize information on-site. Difficulties remain in obtaining and updating information from other sites, which restricts communication and information distribution between different sites. As visualization efficiencies and hardware capabilities mature and continue to improve, the development framework of applications is now moving form "Client-Server" to "Host-based", which is referred to as "Cloud Computing" technology. In this research, we utilize the concept of Software as a Service (SaaS) and Cloud Computing in order to develop a visual system for BIM visualization and manipulation. This system can not only visualize three-dimensional (3D) BIM models, it can also manipulate 3D BIM models through the web without the limitations of time or distance. This system can facilitate communication and distribution of information between related participants, such as construction companies, building owners and architectural companies in order to manage projects effectively and efficiently.
ABSTRACT:The concept of a "green building" was first introduced to Taiwan in 1999, and began to develop regulations for the design and evaluation of energy-saving buildings. The Ratio of Equivalent Transparency (Req) is a basic index for assessing whether a building is energy-efficient. Req is the ratio of the area of total building envelope and the area of envelope equivalent transparency. Calculation of Req requires not simply the consideration of natural factors such as building location, direction, ambient lighting and sunshine, but also and physical factors such as material, structure, ventilation and sunshade. Furthermore, Req is considered particularly applicable due to the ubiquity of terraced houses in Taiwan, given the country's high population density. In this study, the correction factor to include the effect of party walls is added into the formula of Req calculation to prevent distortions to the area calculation of the building envelope. Current practices in Taiwan of manually calculating Req render the results prone to error, and are also time-consuming. To address these issues, this research developed a visual Req calculation tool based on a 3D environment. This system provides users with various visualization tools to view the status and Req results of the building project. Furthermore, object-oriented modeling and parametric design can shorten the time taken to look-up tables and simplify the process of Req calculation, and also help to reduce computation time and errors.
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