Research On Life Cycle Value Of Public Works And Its Comprehensive Evaluation

Public works is an important engineering type in the field of construction in our country,a vital component of the national economic system and social life system.Its investment is big,the risk is high and the influence is large.The success and failure of the project is directly related to the rise and fall of the country and industry.Public works is of great significance to economic development,environmental optimization,social fairness and stability.At present,no stable engineering value system has been established in the engineering field while the sustainable development of construction project is prominent.The traditional public works evaluation system has been unable to meet the needs of modern society.With the engineering philosophy theory in the construction industry research and practice continue to expand,the engineering value thinking has has been widely attention in the industry.Therefore,the field of project management must innovate the development of value theory research,improve the value evaluation mechanism of public works in order to make our public works investment to play a greater benefit,better enhance the performance of public works,and effectively promote the overall development of China's economy.On the basis of fully absorbing the latest research results on the value of engineering field at home and abroad,this paper analyzes engineering philosophy theory,stakeholder theory,value theory and engineering value theory.Firstly,the connotation of public works,the object of engineering value and the subject of engineering value is studied;secondly,the public works lifecycle structure of value system is constructed.Based on the above study,the evaluation model of the value of the whole life cycle of public works is put forward.Finally,synergistic evaluation of public works life cycle value system is carried out.The paper makes a deep research in the following aspects.Firstly,the paper defines the profound connotation of engineering value.On this basis of which,it studies the value object and value subject of public works,elaborates the connotation,classification and characteristics of public works,and then researches the key value subject of public works.Afterwards,the questionnaire and interview method are used to define the core values subjects of the various stages of the public works by descriptive statistics with SPSS tools.And then,based on the confirmation of the core values of each stage,the value elements of public works are extracted,refined and modified through literature analysis and questionnaire research.Finally,the paper determines the value elements of the core value subject of the public works in different stages such as the decision-making stage,the implementation stage and the operation stage.The value element is practical,dynamic and has universal significance.Secondly,on the basis of determination the whole life value elements of public works,the VBS(Value Breakdown Structure)method is used to construct the engineering value system.Firstly,the similar elements are merged,and the value standard is constructed.Then the questionnaire method is used to score the importance degree of each value standard in the decision stage,the implementation stage and the operation stage.The EFA(Exploratory Factor Analysis)method is used to explore the value factor of each value standard,and the value factor of each stage of public works is extracted to form a complete public works value system structure constructed by value element,value standard,value factor and value subsystem.Then,the value system structure table and value system diagram of the various stages are drawn.Then,aiming at the lifecycle value evaluation model of public works,this paper attempts to apply Planguage method and D-S evidence theory to the value evaluation of public works.The quantification criteria of value evaluation are studied by using Planguage method and the scores of each index are evaluated.The evaluation model of public works value is constructed by using the Mass function calculation and synthesis rule in D-S evidence theory.Finally,the results of value evaluation are given by quantitative level,and the empirical study is carried out.Taking Nanjing Metro Line 3 as a case,the paper writes MATLAB calculation program to evaluate value of public works.Finally,based on the research of public works value quantification,this paper carries out the synergistic evaluation of public works lifecycle value system.Based on the value system of public works,according to the basic process of value movement,the synergistic relationship of the decision-making stage value system,the implementation stage value system and the operational stage value system is analysis.Using the SEM(Structural Equation Modeling)method and field investigation,interview questionnaire and other forms of quantitative analysis,the affect path coefficient of the value factor of the decision-making stage on the value factor of the implementation phase is obtained,and the affect path coefficient of the value factor of implementation stage on the value factor of operation phase is also concluded.Then,the affect path coefficient of the value factor of public works decision-making stage on the value factor of operation phase is analyzed.This paper focuses on the application of value theory in the management of public works.It highlights the study of the essence of engineering value,the quantitative evaluation of value and the operation rules of value,defines the connotation of engineering value,and extracts the lifecycle value requirement elements of public works value subject.This paper puts forward the method of quantitative evaluation of public works value,analyzes the influence path coefficient of the various value factors of the public works lifecycle value system,and obtains the general operation rules of the value of public works.The research results help to promote the application of the theory of value theory in China's engineering field,which has found a key entry point for the project value management in the field of public works in the future and has very good guiding significance for the decision-making,construction and operation of public works.