Research on Multi-objective Optimization of Prefabricated Building Construction Under the Background of "Dual Carbon"

Abstract:

To address the multi-objective optimization problem of construction time, carbon emission and cost in prefabricated building construction, the construction activity process and resource allocation of the standard floor main structure of prefabricated buildings were systematically reviewed. The carbon emission sources and categories in the construction process were identified, and a carbon emission accounting model was constructed by combining the process evaluation method and emission factor method. A carbon emission accounting list was established, and the economic impact of carbon emission was analyzed, providing a basis for construction carbon emission accounting. Considering various resource combination modes of construction activities, the uncertainty of activity time and carbon cost, a discrete multi-objective multi-mode combination optimization model was constructed based on the construction time, carbon emission and cost of each activity under different modes. In response to the characteristics of this optimization model, the non-dominated sorting whale optimization algorithm was discretized. The Pareto solution set of the construction mode combination scheme was obtained through algorithm solution, and the non-dominated schemes were comprehensively ranked using the Analytic Hierarchy Process-improved entropy weight method combined weighted Technique for Order Preference by Similarity to Ideal Solution. This provided a comprehensive ranking for non-dominated schemes, enabling ma-nagers to select the best solution. The application results of engineering examples show that the construction time, carbon emission and cost have been effectively controlled, meeting the expected goals of managers, and verifying the scientific nature of the optimization model and the practicality of the solution method.