Relationships of Construction Time and Cost for Railway Projects in Ethiopia
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Date
2015-07
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Addis Ababa University
Abstract
The principal objectives of this research are to develop a model to project duration based on actual executed amount and to check the validity of Bromilow’s principle for Ethiopia Railway Corporation (ERC) projects. This study mainly focuses on ERC projects that are under construction and that have a better progress. Addis Ababa Light Rail Transit (AALRT), Sebeta- Miesso and Miesso –Dewnale projects have a better progress than other projects that are recently commenced. So, the data for this research is mainly conducted from these projects. Statistical regression models and correlations are developed using real data of three projects. The collected data was tested for correlation by SPSS tools after the data was transformed in to different functions and obtained result showed that the transformed data was in better correlations and then the regression model has been developed by the help of SPSS software. So, Regression-Correlation was the method used in this research. The obtained result from the analysis indicates that the Bromilow’s principle expressed in the form of T=KCB, where T is the actual construction time, K is the constant characteristics of the performance, and B is a constant indicative of the sensitivity of time performance to cost level is valid to ERC projects and different regression models have been developed as shown on the analysis part of this research. The model result can be used by project managers in the planning phase to validate the schedule critical path time and project budget and can be used by ERC to predict duration of the project while bidding new project. This regression model for repeated projects could be more precise if more independent variables were considered and if data were larger better models could be provided.
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Keywords
Time - Cost relationship, Bromilow’s Principle, BTC Model, Regression Analysis