The PPP model has the advantages of alleviating government financial pressures,improving investment management efficiency,and satisfying public infrastructure construction needs.The public and private have different standards and requirements in risk assessment and sharing,and benefit distribution,resulting in the consumption of PPP project negotiation process and restricting the progress of the project.Therefore,the PPP that have a reasonable and fair project risk assessment and sharing,and benefit distribution mechanism needs to be established to improve the efficiency of PPP project operations.Based on the relevant literature,this study summarized the characteristics of risk assessment and sharing,and benefit distribution,built a profit distribution model for PPP projects based on risk assessment and sharing,and selected an underground comprehensive pipeline PPP project in downtown Guangzhou as an example to conduct empirical research.Research,as follows:(1)Based on the risk identification and evaluation research of PPP project,a risk assessment model of PPP project based on rough set theory was established.Using the literature research/statistics method,18 papers were collected based on the principle of high citation.The factors with a frequency of 9 or more were selected as the preliminary risk evaluation index system.Finally,a questionnaire survey method was used,and an algorithm rule based on rough set theory was used,combined with Python programming,determine the final risk assessment indicator system and its weights,a total of 9 risk factors.(2)In the aspect of risk sharing of PPP projects,a risk sharing model of PPP projects based on game theory was established.The main body of the final risk assessment index system was determined,and in combination with the bargaining game theory,the risk sharing of the public and private under complete information was obtained.value.(3)Based on the profit distribution of PPP projects,a profit distribution model for PPP projects based on risk assessment and sharing was established.Under the premise of considering the basic principle of interest distribution,the principle and formula of shapely value correction are combined to determine the benefit distribution plan of this case,that is the ratio of the publice and private allocation is 41.44:58.56.The results show that the risk assessment of PPP projects should focus on force majeure,financing risks and interest rate risks.Reasonable risk sharing should be for non-co-shared risks and more on the principle of risk control and distribution.In terms of sharing risks,the public The proportion of actual sharing should be slightly larger than the proportion of the private sharing.In terms of the distribution of benefits,the basic plan for the private is to allocate more income than the normal distribution of income under the influence of risk assessment and sharing.The project case analysis is empirical.The above ideas are feasible.It is suggested that the project company strengthen its response to risks such as force majeure,financing and interest rates in terms of assessment,analysis,prevention and control,and mechanism construction.The public and private should adopt corresponding sharing strategies for different types of risks.In terms of benefit distribution,it is recommended that Both parties should establish a reasonable dispute settlement mechanism and an effective communication mechanism for all parties. |