Research On The Risk Of Long-span Bridge's Construction Project

In recent decades, with the rapid development of road construction and large-scale urban renovation, the number of roads and municipal bridges increases greatly and the scale also becomes much larger. Meanwhile, bridge-construction starts facing increasingly serious risk of potential accidents. Thus, how to make the key decisions more scientific on bridge engineering projects, and especially how to understand and respond to the uncertainty which may happens in the process of bridge construction and use, becomes one of the most representative and significant issues ever. Using risk assessment to solve engineering problems in complex decision-making and dealing with these issues based on risk management grows to be the newest idea to solve problems above.In this paper, the author proposed the methods and steps of determining the sources of risks in bridge project, and had a analysis of the risk assessment methods. Setting the HeNan Bridge as the project backgroud, this thesis adopted the combination of qualitative and quantitative analysis, determined the main sources of risk through a list of data survey, and focused on the risk assessment of several programs. Finally, it put forward the causes of risks, probability of the occurrence and the potential loss caused, and brought out reasonable proposals on how to avoid the risk of occurrence.Through the analysis, there mainly exist below security risks in this bridge project:ship impact, seismic engineering, continuous rigid frame cracking, deflection and collapse of steel-concrete composite structure construction, automotive overload, car crash bridges, wind-induced disasters. etc. Under the full consideration of the structural system, construction technology, engineering, construction feasibility, applicability, wind resistance and seismic project operation management, all the risk level for these three programs are grade II Therefore, from the perspective of the ability to resist risks, all the three designs can meet the needs of this project.