Research On Risk Analysis Of The PC Cable-stayed Bridges During Construction

Based on the existing theories and methods of the bridge construction risk analysis,combined with the construction features of the PC cable-stayed bridges,This paper analyzesthe PC cable-stayed bridges construction risk, around the following aspects to start work:1) Based on the research status of bridge construction risk analysis at home and abroad,the risk meaning and measurement is clarified, to draw on existing bridge construction riskanalysis theory, the theoretical framework and the theoretical system of the PC cable-stayedbridges construction risk analysis is pointed out, and the basic idea and basic content of thePC cable-stayed bridges construction risk analysis is put forward.2) Combined with the relevant research results of the risk sources identification, the riskprobability evaluation and the risk loss evaluation, the PC cable-stayed bridges constructionrisk assessment method is put forward, which is based on the fuzzy hierarchy identificationmethod, the F-A-M risk probability evaluation method, the loss equivalent evaluation method.The fuzzy hierarchy identification method can achieve the quantitative identification of theconstruction risk source; Using the F-A-M risk probability evaluation method can solve theproblem of the PC cable-stayed bridges structure function non-explicit and high-ordernonlinear; By the loss equivalent evaluation method, the quantitative assessment of the loss(environmental loss and social loss) that is difficult to quantify is achieved. At the same time,by means of the finite element software and the MATLAB software, the efficiency of thebridge construction risk assessment is significantly improved, and can achieve the quantitativeassessment of the PC cable-stayed bridges construction risk.3) Based on existing research results of the risk assessment and risk treatment anddecision-making, combined with the level of China’s economic situation, corresponding riskacceptance criteria, risk level evaluation criteria and risk decision-making criteria areestablished, which can reflect the current level of economic development and the PCcable-stayed bridges construction industry conditions, and can reflect the nature of the risk,achieve the construction risk evaluation of the PC cable-stayed bridges. 4) Relying on the Yongjiang Bridge, focusing on the construction risk analysis of thelargest cantilevered stage, and according to the risk level evaluation criteria, YongjiangBridge construction risk level is assessed, and the corresponding construction riskdecision-making proposal is finally put forward, so that can provide an important referencefor the actual engineering construction.