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(BIM-3675) Using 4D Modeling to Perform Critical Path Analysis for Delays

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Level: Intermediate
TCM Section(s):
6.4. Forensic Performance Assessment
11.3. Information Management
Venue: 2021 AACE International Conference & Expo

Abstract: Historically 4D modeling, which connects the physical 3D model to the time-dependent schedule activities, has been used primarily to compare the as-planned and the as-built condition, providing a visual comparison presentation that helps visualize the time difference in performance but provided no other analysis.Using the full power of a 4D model, this paper shows a practical process that provides critical path method (CPM) analysis to determine delay and the ramifications of delay.Instead of pages of tedious analysis development, this process shows direct delays to the critical and near-critical path including mid-period critical path shifts in the 4D model itself.The process demonstration uses an actual project with real project data to analyze and determine delays.This can be used in contemporaneous project analysis during the schedule update process as well as for after-the-fact forensic schedule analysis situations.

The authors have a strong depth of experience in CPM scheduling, building information modeling (BIM), 4D modeling, and virtual design & construction (VDC), having produced and used models for projects such as industrial plants, bridges, and buildings.They combine this BIM/4D/VDC modeling and CPM scheduling background with forensic analysis expertise to produce a useful and meaningful technique.