| In recent years there are more investments in high-speed rail projects.But with the development of high-speed railway, there are more problems in China's high-speed rail construction projects,such as land demolition,lack of critical equipment,uncooperative stakeholders,lack of funds, did not meet the relevant technical standards, frequent drawings change, and so on.These occuring problems often lead to project delay and even failure.In order to improve the success rate of high-speed railway construction project to prevent and control high-speed railway construction project risks, high-speed railway construction project risk prevention has become the focus of the study.The previous literature focuses on the identification of risk factors from the high-speed railway construction project, the prevention and assessment of the risk and risk prevention control measures, but with the expansion of high-speed railway construction project and the increase of investment, many large projects, especially complex projects of multi-enterprise cooperation, as it relates to multiple stakeholders, the successfully coordinate and good stakeholder relationships would have a significant impact to project sucess.The responsibilities and needs of stakeholders in the high-speed railway construction project is reflected through the construction project contract, so the research about high-speed railway construction project contract management and risk control can effectively guard against the risk of construction projects.Past research on a construction project contract focus on selecting from the construction of the type of contractcontract risk assessment within the organization contract management, contract bidding, signed to fulfill the contract claims, contract mode selection, setting the terms of the contract, construction contract practice in terms of construction project contracts, these studies were based on different perspectives to study construction project contract, and had made outstanding contributions in the field of construction contracts, they can also be applied in the high-speed railway construction project study and project practice.However, these studies are building in a single contract point of view or fro m a business perspective within the study on management of construction project s. With the increase of large-scale projects, the study on sub-contracts and the c ontract group of the high-speed railway construction project has not begun. This paper focuses on the high-speed railway construction project sub-contracts and su b-contract groups, proposed the concept of the contract cluster, and through a qu estionnaire survey and literature, summarized and classified the elements of high-speed railway construction project contract cluster. By factor analysis and structu ral equation methods, and analyzes, we analyzed the impact of the construction p roject contract group associated with elements of construction projects success. T he main content is divided into three parts:The first part is Chapter1and Chapter2.This essay studied the current rese arch on construction project, construction project contract research and constructio n project success criteria which were reviewed and summarized. We analyzed the existing limitations, and the various problems during the current high-speed rail construction projects operation, and reviewed the relevant literature, based on this we proposed the importance of high-speed railway construction project contract cluster research.The second part is chapter3and chapter4, we proposed the concept of hig h-speed railway construction project contract cluster, and analyzed the compositio n of the high-speed railway construction project contract cluster related elements. The concept of contract cluster is newly proposed in this article, unlike previou s studies, this article consider multiple contracts within the complex project base d on the perspective of the overall system and studied sub-contract changes and its'impact on the entire project. Chapter4analyzed the previous literature, and selected200high-speed rail contract, as well as interviews with high-speed rail c ontract management staff to get high-speed rail contract cluster index system. On the basis of the factor analysis method the project contract group of15indicat ors were divided into five basic elements:the principal elements of the contract, the terms of the contract element, the relationship between elements of the cont ract interface, the contract management element and legal environmental elements.The three part is chapter5,chapter6and Chapte7.Based on the research bef ore we proposed theoretical model of the high-speed railway construction project contract cluster impacting the success of the project. By the use of structural e quation methods to validate and analysis the collected data, the relationships amo ng the five elements of contract cluster and the impact on the project success w ere given.Based on the contract cluster perspective on high-speed railway construction project contract management, with the construction contract theory, the theory of project success, the factor analysis matrix, structural equation methods, the essay studied the definition of the construction project contract cluster. Within the influ ence of sub-elements of the contract cluster on high rail construction projects su ccessful relationship, the following conclusions were obtained:First, building related concepts of high-speed railway construction project con tract cluster and the contract cluster connotation analysis, the contract cluster is t he new defined organizational structure framework on the existing and future con tract of the contract cluster. These contracts are based on the organization's strate gic objective, through a series of changes to create interest more than sum of cl usters of individual contract with the organization of internal and external enviro nment. The contract cluster is a group composed of a number of sub-contracts, which is a system relative to the internal sub-contracts. The sub-contract within t he system is not independent existence, but they are interrelated. The relationship between the stakeholders can through sub-contract as the carrier and by the rela tionship among the contract and the contract contracts cluster, which can reflect t he operation of the project. Through the coordination of the relationship between the contract groups within the sub-contract, the overall effectiveness of a single contract can not compared are obtained.Second, by the factor analysis of the indicators within the contract cluster o f high-speed rail system, the high-speed rail contract cluster elements are divided into five categories. The main resource, the main qualification, the main capital are divided into a class, which can be named as the contract subject elements. The general terms, specific terms and the terms of the post-commencement oblig ations are divided into a class, which can be named as the contract text element s. The contract intent relations, stakeholder relations are divided into a class, whi ch can be named as the contract interface relationship between elements. The pr oject control management, and related facilities are divided into a class, which c an be named as the elements of contract management. The macro-legal environm ent, the specific details of the terms are divided into a class, which can be nam ed as legal environmental factors.Third, building the initial structural equation model of the associated element s of the contract cluster on high-speed railway construction project, and using str uctural equation modeling to analyze with surveyed data. The conclusion shows f ive contract elements of that high-speed railway construction project:have mut ual influencing relationships, the changes of each element will have an impact o n other elements. And the changes of each element will not only affect other el ements, and will ultimately produce a positive correlation to project success.This essay studied the "High-speed railway construction project contract", with the contract cluster based on the systems theory as a research perspective, which breached the original contract management research within a single contrac t or a single organization, and proposed the model of association factors among multi-stakeholder collaboration high-speed rail project contract cluster impact on t he success of the project. The main innovation lies on the following:First, study the high-speed railway construction project based on the perspective of the contract cluster. Although the research on the construction project contract management gradually increased, but most of studies are about the single constr uction project contract, the study about contract cluster related to different stakeh olders within a high-speed rail project contract as a whole are smaller. This essa y constructed the concept of contract cluster, which is systematic and holistic. C ontract cluster based on complexity theory deeply studied the complex relationshi p among the project group. The complexity of the contract group is not only ref lected by its structure, but also reflects the relationship between the contract gro ups within each unit.Second, this essay refine and validate the impact of the associated elements of the contract cluster on high-speed railway construction project. With "contract cluster" for the study, we designed the relational model of the impact on the su ccess of the project on high-speed railway construction project contract cluster. T he contract cluster within the index system is identified into five elements. We a nalyzed the affect among these five elements on high-speed rail construction proj ects, with a unified framework to study and identify the multiple associated elem ents within the contract group relationship to the success of the project and impr oved the construction project contract management theory.Third, study the specific high-speed railway construction project, which can b e applied to high-speed railway construction project in practice, breaker the origi nal study based on the individual contracts. It also have great practical value on contract management areas, high-speed rail contract management, contract biddin g and performance of the contract. Contract cluster theory also has important ref erence on research about the complex projects of multi-enterprise contract manag ement, which not only has important theoretical and practical significance, but al so has long-term research value and broad exploration of space. I hope it can be further explored in the future on these issues.
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