A method for analysing delay duration considering lost productivity through construction productivity data model

A delay claim occurs due to the difference between the actual completion date and the contract completion date. Though the responsibility and duration of a delay is very important information on analysing a delay claim, it is generally difficult task because there are many factors complicatedly affecting the delay. Lost productivity or loss of productivity is one of major factors causing a delay. However, there are few studies on converting lost productivity into delay duration. Thus, to calculate fairly the delay duration of the liquidated damage, it is needed a calculating method related to many impact factors and their impacted productivity. This study proposes a method for analysing delay duration considering lost productivity by using strong points of schedule such as CPM, Bar chart consistent with the project phases and construction productivity database maintained data consistency and minimized data redundancy. The main outcomes of this study are: (1) a method of calculating delay duration caused by lost productivity, (2) a data model that is a basis of the database containing information regarding lost productivity. With these outcomes, delay durations and responsibilities could be more accurately calculated.