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

Over the last decade, the emergence of various risks and hazards threatening large and infrastructure projects has become a concern for governments and governmentaffiliated institutions. Thereby, Ruild-Operation-Transfer (ROT) 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 based collective criteria approach and Decision-Making Trial and Evaluation Laboratory (DEMATEL) methodology are proposed under Dynamic Tntuitionistic Fuzzy (DTF) set environment. Tn this respect, the weight of each criterion is determined by DTF-collective criteria method and also, the interdependent relation between criteria is computed by developed DTF-DEMATEL methodology to tune the criteria weights. Tn addition, the weights of experts are determined by the proposed DTFutility degree method to reach a precise solution. Moreover, the proposed approach of this study is extended based on last aggregation concept to reduce data loss. Then, the proposed methodology is implemented on a real case study and the results are compared with recent findings in the literature to ensure the reliability of the obtained results. Finally, a sensitivity analysis is manipulated to find the most effective parameters that can change the obtained results. (c) 2024 Sharif University of Technology. All rights reserved.