Risk Analysis For Long Span Continuous Rigid Frame Bridge With High Piers During Construction

In recent years, with the innovation of bridge forms, big span continuous rigid bridge structure has been developed rapidly. At the same time, the construction risk of big span continuous rigid bridge is increased greatly. It is easy to appear engineering accidents which. With the structure of innovation and the increasing of span, large span continuous rigid frame bridge engineering construction is facing unprecedented high risk, which will endanger the safety of life, property and structure. Carrying out the risk analysis of the bridge structure can check out the Problem existed in design and grasp the potential risk in construction. So that to develop a positive and effective risk response strategies in order to improve the security of the implementation of the project.This paper describes the domestic and international trends of risk analysis, the significance of risk analysis, problems in risk analysis, and the basic theory and basic methods of risk analysis. The object of this paper is Youfang ditch high pier large span continuous rigid frame bridge construction process risk analysis. Focusing to consider the structure of bulk density, prestressing force, unbalanced counterweight, the impact on modulus of elasticity of the main bridge structure. Based on the actual project to create a finite element model of the space. Most unfavorable construction phase of the structural parameters of the bridge construction process through the use of "sensitivity"-"orthogonal design"-"finite element"-RBF neural network "-" Monte Carlo "analysis method for risk identification, quantitative analysis on risk primary and secondary factors, and on this basis conducting the risk probability analysis of bridge construction, estimating the construction risk level, developing appropriate risk response measures to ensure safety of the bridge construction project to successfully implement and complete, and provide a reference for the formulation of structural optimization and construction control program.