Risk Losses Research Of High Pier And Long Span Continuous Rigid-frame Bridge In The Construction

Risk loss analysis is one of the important components of Bridges Risk Analysis system, its principal purpose is to quantify the Bridges Risk Consequence, to obtain the final risk value, and provide foundation for risk assessment and sick decision. Most of the past Bridge Risk Analysis only pays attention to study of risk probability, but existing research rarely involves the consequence and loss suffered from the bridge accident. Most of those few research is also a qualitative analysis, seldom quantitatively. Research of Structure loss which is the main form of Risk Loss is not specific enough, and it greatly influences the veracity and reliability of Bridge Risk measurement system. Therefore, it's very necessary to quantify the Risk Loss, to establish a practical and accurate Risk Loss assessment system which based on analysis of Structure loss. The paper focuses on the Risk Loss of long span continuous rigid-frame bridges during construction, and mainly revolved the following areas:1.Research on the structure and theoretical of the Risk Loss of long span continuous rigid-frame bridges during construction,To clearly define the Risk Loss, explain the intension and extension of Risk loss, introduce the theory about loss classification and measurement, and propose the mainly method about Bridge Risk Loss analysis. The paper also established a comparatively integrated theory framework about Bridge Risk Loss analysis,2.The paper established a measurement system of Bridge Risk Loss,it proposed a overview model and the separate models about Bridge Risk Loss during construction . The overview model comprehensively considers various risk losses by a rational form, and reflects the risk loss severity visually by a quantitative result, the separate models make quantitative analysis bout various risk loss.3.According to the situations that the risk loss is difficult to quantify and the result is not accurate enough, this paper proposed a quantitative estimation method to simulation analysis for bridge construction suffer from accident by using finite elements software, and provide basis for Bridge Risk Loss analyzing.4.Responding to the distinguishing of long span continuous rigid-frame bridges during cantilever construction, the paper simulation analysis on the main-type destroys (intensity failure and destabilization failure) of bridge structures suffer from a risk accident of hanging basket crashed, and summarizes the rules and characteristics about bridge structural deterioration.Based on the clear definition of structural damage, according to the measurement theory of Bridge Risk Loss, the paper carry out a quantitative assessment about various losses, those losses include structure loss, equipment loss, life loss, construction time loss, environment loss and society loss. By using the method of" equivalent weight of consequence", various loss were translate into the form of money, and a total value of Bridge risk loss can also be obtained.