چكيده به لاتين
One of the development indices in any country is the scope and amount of construction activities. Thus, application of a scientific method and the use of decision techniques for the selection of contractors is inevitable. Such choices are currently made based on the lowest price proposed by the qualified contractors. Contractors deemed qualified in the first step are normally evaluated to be the same as other contractor by the employer and are usually compared based on their proposed prices. The purpose of this research is improving contractor selection through inclusion of contractor evaluation criterion based on risk factors in order to control the risks involved in construction projects.
To achieve this goal, using library research, interview with experts, and review of construction projects of Ferdowsi University of Mashhad (FUM), 63 risks in 8 categories were detected. Then, by using the technique of gray theory, the weight of the project goals (time, quality, and cost management) and the impact level of the studied risks on the aforementioned goals were assessed and ratified. Using the Kolmogorov-Smirnov and the one-sample T-test the data were examined and the quality of the selected risks were confirmed.
The top risk was chosen and using the DEMATEL technique, their internal relationships were studied. Considering the existence of internal relationship between risk factors, the analytic network process, corresponding to the chosen risk factors, was used to score the contractors. In the last step of choosing the selected contractor, analytic hierarchy process was used and by considering the three criteria of qualitative evaluation, risk factor based evaluation, and proposed price, the decision making structure was formed; the model of this research was tested in 4 tenders with varying conditions. Comparing the results of the proposed model and the current model proved the research to be true.
