An intuitionistic fuzzy multi-class approach for risk assessment in sustainable BOT highway construction projects: A case study

Document Type : Article


1 Department of Civil Engineering, Qeshm Branch, Islamic Azad University, Qeshm, Iran

2 Associate professor, Technical and Engineering Faculty, University of Qom, Qom, Iran

3 Assistant professor, Department of Architecture, Science and research Branch, Islamic Azad University, Tehran, Iran


In last decade, the emergence of various risks and hazards in large and infrastructure projects has become a concern for governments and government-affiliated institutions. Thereby, BOT contracts have been set up to prevent these risks at the national level, leaving the design, construction, and operation of the projects with all investments to a foreign or private company. Meanwhile, a multi-phase weighting approach based-collective criteria and DEMATEL methodology is proposed under dynamic intuitionistic fuzzy (DIF) set environment. In this respect, the weight of each criterion is determined by DIF-collective criteria method and also the interdependencies relation between criteria is computed by developed DIF-DEMATEL methodology to tune the criteria weights. In addition, the weights of experts are specified by proposed DIF-utility degree method to reach a precise solution. Moreover, the proposed approach of this study is extended based on last aggregation concept to reduce the data loss. Then, the proposed methodology is implemented to a real case study and also compared with a recent relevant study in literature to ensure the reliability of the results. Finally, a sensitivity analysis is manipulated to find the most effective parameters that can change the obtained results.