Real-time Synchronization of Activity Simulation Based on Construction Duration Proportionality

Abstract

In a 4D CAD system, the 3D representation of the completeness of each activity is usually expressed based on a specific date, such as the finish date of the activity, with the activity described in only two forms: completed or uncompleted. In such a representation, the completion of the activity is not visible at the beginning of the construction period, and the entire completion is displayed at once at the finish time. In other words, there is a gap between the completion status of the simulated activity according to the planned construction period and the completion status according to the actual construction period. In particular, the representation of vertically high structures such as bridge piers and horizontally long structures such as tunnels and earthworks is more different from the actual progress status. To address these issues, this study develops a methodology based on the morphing technique, which proportionally simulates the completed state of an activity over the construction progress. The methodology is then implemented to verify its applicability in real-world projects. To this end, the central axis of the axial direction for each 3D model is determined. A methodology and corresponding function are then developed to simulate completion along the central axis in proportion to the construction progress. In this way, the completion of the activity is expressed proportionally by date according to the construction period, so the activities with a long construction period can be simulated similarly to the actual progress of the activity by date on the construction site.