Delay analysis considering production rate

There are various methods offered in construction literature for determining the schedule impact resulting from delays and interruptions. Previous scheduling technique makes the assumption that the relationship between time and the number of units produced is linear. Accordingly, progress is assumed to be equally distributed along the activities' durations. Often this assumption does not reflect the real situation for the progress of construction activities. Some activities are naturally nonlinear and others exhibit nonlinear progress. To insure reality and reasonableness, delay analysis must allow for nonlinear production rates as well as linear production rates in the delayed activities. Therefore, there is a need for a delay analysis method that incorporates the varying rate of production for the delayed activities. This paper proposes a delay analysis method that can rationally apportion the concurrent delay with consideration of the nonlinear production rates of activities in construction projects. A simple case study has been implemented to demonstrate the accuracy and usefulness of the proposed delay analysis method. This research is useful for both researchers and practitioners for the case including the varying productivity due to delays and interruptions and allows transparent and rational analysis on concurrent delay to facilitate claim analysis.