PRODUCTIVITY AND COST ANALYSIS BASED ON A 4D MODEL

Four-dimensional (4D) CAD models are being used more and more frequently to visualize the transformation of space over time. To date, these models are mostly purely visual models. Any evaluation of a 4D model, e.g., whether it presents a workable construction sequence, is left to the viewer. The evolution of 4D CAD demonstrates the ability to provide a tighter link between visualization and analysis tools. In this paper, we discuss how an intelligent 4D model helps identify time-space conflicts between concurrent activities and provide assistance in calculating more realistic cost estimates. The 4D system (4D Work Planner) presented here is based on symbolic and graphic product and process models, and provides both the visual and analytical feedback necessary to reengineer construction sequences.