2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Sensitivity Analysis of Construction Schedule Performance Due to Increase in Change Order and Decrease in Labor Productivity

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Author(s)
Dr. Sharareh Kermanshachi, University of Texas at Arlington (Presenter)
Mr. Behzad Rouhanizadeh, University of Texas at Arlington
Abstract

In the initial steps of construction projects, the contractors do an effort to predict the construction process and timings as accurate as possible; however, a number of change orders (COs) and corresponding reworks are inevitable. A routine challenge in every project is to quantify the impact of COs on labor productivity which can cause adverse consequences on the cost and schedule of the project if not be measured and controlled appropriately. There are many variables that impact the construction process and the duration of the project. For owners and contractors, it is important to know which variables more critically violate the project process and timing. Therefore, in this study, a sensitivity analysis was performed to identify the variables that more significantly influence the performance of the system and project duration. The analysis was performed for a typical project plan case in order to understand how the plan changes with the changes in variables. Project duration was most sensitive to the project deadline and as the project deadline decreased, the project duration increased. However, this effect was only seen after a certain reduction in the project deadline. An 80% reduction in the project deadline resulted in about a 95% increase in the project duration and an increase in the project deadline had little effect on the project duration. The results of this study can be used by the project planners to avoid exceeding change orders within the projects.