Research on evolutionary game and efficiency improvement of construction supply chain based on information sharing

With the development of China's construction industry, the integration of leading enterprises increases rapidly, and the differentiation of the construction industry is getting faster. The general contract model and integration of investment, construction, and operation will be the trend in future. Under this background, the competition between construction enterprises has transformed into competition in the supply chain. The core of supply chain management lies in achieving the overall optimal goal through collaborative decision-making among participants, and information sharing is a precondition for collaborative decision-making. Therefore, information sharing is key to the smooth running of the construction supply chain. By studying the information sharing behaviors of participants, analyzing and determining the factors that affect their decision-making, and studying how these factors affect their decisions and the stable running of the supply chain system, targeted measures can be taken to enhance the willingness of participants to share information, promote the smooth running of the supply chain, and enhance its overall competitiveness. Based on the evolutionary game theory and from the perspective of information sharing, this paper establishes a three-party game model of owners, general contractors and subcontractors, determines the factors such as shared income, cost and risk in combination with the actual situation, establishes the income matrix and the replicated dynamic equation to analyze the model, and then carries out simulation with Matlab software. Combining theoretical analysis and simulation, this paper studies the influence of the changes of income, cost and risk parameters on the game process and the running state of the supply chain, and determines the key factors that have positive and negative effects on them. At the same time, when the construction supply chain tends to be stable, the benefits of implementing information sharing and not implementing information sharing are compared quantitatively, so as to clarify the impact of information sharing on the benefits of participants. The study found that an increase of information sharing, the coefficient of collaborative benefits, and the coefficient of collaborative effects will lead to an earlier time for the three parties to reach a relatively stable state during the evolution process, while an increase of information sharing cost and the risk coefficient will delay the time for the three parties to reach a relatively stable state. This indicates that the more sufficient information sharing among all parties and the more benefits obtained from implementing information sharing are more conducive to improving the overall stability and competitiveness of the supply chain. However, the increased cost and risk losses are not conducive to the overall stability of the supply chain, thereby reducing its competitiveness. The benefits and costs are key factors that affect the overall stability of the supply chain. In addition, the study also found that when all game participants adopt information sharing, both the total income and their respective income are better than when they do not adopt information sharing, which proves that abundant information sharing is an effective way to improve the overall competitiveness of the construction supply chain. Compared with the existing studies, the tripartite game model constructed in this paper and the setting of the influencing factors of information sharing added in the model are more consistent with the actual construction supply chain composition. The quantitative method is more conducive to the in-depth study of information sharing, and the research conclusions can be better applied to practice. Based on these research results, the enterprises can further consider how to strengthen information sharing and synergistic effect between each other through technological means or information communication mechanisms in practice, as well as how to reduce information sharing costs and risks, such as using BIM and blockchain technology to promote the stable running of the supply chain and enhance its competitiveness.