A CAD-based model for site planning

This paper presents a computer-aided design (CAD)-based site layout model designed to account for the diverse nature of construction sites. In the proposed model, the site layout problem is represented by a flexible object-based model. The model allows the configuration of physical objects and their encapsulated attributes to suit the unique demands of each project. This feature facilitates the transfer of experts' knowledge to a set of libraries imbedded in the developed model. The paper describes the structure of the proposed model and its four components: (i) user interface; (ii) database; (iii) project; and (iv) layout control modules. The functionality of these four components and their interconnectivity are also discussed. The developed model is implemented in a computer system that operates in CAD environment and makes use of object-based design concepts. Two numerical examples, drawn from the literature, are analyzed and the results are compared with those reported by other earlier. The examples demonstrate the use of the developed model and illustrate its essential features.