Study Of Investment Risk Evaluation And Control For Long-span Cable-stayed Bridge Project

With advantages of long span length,high strength,beautiful shape and novel structure,the cable-stayed bridge developed at top speed during the last several decades as an important part of the transport infrastructure.A series of world-leading long-span cable-stayed bridge have been built under the impetus of the government to cable-stayed bridges.But the construction of cable-stayed bridge suffers from massive investment amount,long construction period,complicated implementation technologies and high difficulty of project management,which causing some risks for relating project investments or poor investment results.Meanwhile,we are relatively weak in the theory and practice of the investment risk analysis of long-span cable-stayed bridge,which can't meet the needs of investment risk management.Thus,comprehensive and systematic researches about deepening for long-span cable-stayed bridge project risk analysis and control theories not only play an important role in improving bridge project risk management but also exert great meaning for ensuring program construction target,by improving risk management skills and investment effect of the long-span cable-stayed bridge project.Targeting to long-span cable-stayed bridge project risk analysis,this paper finishes the following researches:Firstly,from the perspective of construction complexity other uncertainties,it analyzes the correspondent features about long-span cable-stayed bridge project risks and conducts a research about the formation mechanism of investment risk of long-span cable-stayed bridge project.Then,it applies ranking holographic mode and combines the descriptive statistics and reliability to identify the risk domain of long-span cable-stayed bridge project.After that,it utilizes risk influence to make coupling analysis for the risk factors of long-span cable-stayed bridge project.Under this conditions,it established a Fuzzy Synthetic Evaluation Model based on Fuzzy DANP-Entropy Method for evaluating risks of long-span cable-stayed bridge project investment.Next,on the basis of investment risk identification and evaluation,the author studies the investment risk control system for long-span cable-stayed bridge project from the perspective of Life-cycle hypothesis,so as to improve the project risk management theory about long-span cable-stayed bridge investment;Finally,taking the Chibi Yangtze River highway bridge as an example,the author creates an investment risk evaluation index system for analying risk of this project investment with the model proposed in this paper,and verified the validity and applicability of it.