چكيده به لاتين
Value engineering is one of the improvement techniques that was invented during World War II due to the lack of resources and raw materials. Since then, this technique has been used in various fields such as civil engineering and related projects. The increase in the duration of construction projects due to complex design and financial limitations and as a result of delaying the completed project costs, causes a lot of damage to the economy of countries. On the other hand, hurrying to increase the execution speed causes quality components to fade. Among the construction projects, the importance of railway transport and its positive effects on the country's economic structure and growth, including production, investment, and employment, are not hidden from anyone. For many reasons, such as high infrastructure costs, multiple shareholders, and numerous budget and time constraints, railway projects require a scientific and accurate approach in all phases of the project, from design to implementation and operation. In the meantime, the value engineering technique can create a reasonable balance between the speed of execution and the project quality by focusing on the function and seeking to reduce costs.
According to what has been said, if the value engineering criteria can be used to evaluate the tenders for the construction of railway lines, we can witness the selection of the right contractor in the right tender and create the most value. In this research, a two-stage model was designed to achieve this goal. In the first stage of the model, after the literature review, using the opinions of experts in the field of railway transportation, six criteria were selected according to the value engineering criteria, and using these criteria, six new railway line construction projects were selected and prioritized. Based on the obtained results, the "Isfahan-Ahvaz" project has the highest implementation priority and the "implementation cost" criterion has the highest weight among the identified criteria.
In the second stage of the model, the tender related to the project with the highest priority has been evaluated using the four main criteria of value engineering. Based on the obtained results, "Kayson" company was chosen as the winner of the tender and the criterion of "offered price" had the most weight among the criteria used. Considering that this company won in the actual bidding process that was held earlier, it can be claimed that this choice was made correctly. Finally, to validate the proposed model, sensitivity analysis has been used.
