Risk Analysis Of Construction On Concrete Filled Steel Tubular Tied Arch Bridge Of Integral Lifting And Installation

At present, bridge construction safety accidents happened frequently, which caused significant casualties and economic losses. Strengthening construction risk assessment and risk control is imminent. Concrete filled steel tubular tied arch bridge of integral lifting and installation has economic benefits and social benefits. But these bridges are applied less in our country and there are large risk in construction process. Concrete filled steel tubular tied arch bridge of integral lifting and installation is studied based on construction risk analysis theory and method. This paper studies around the following five aspects:1) Risk analysis of construction process of bridge construction risk analysis process is clear based on basic concept of risk and basic theory of risk analysis. The basic theory of bayesian network is summarized based on the calculation of construction risk probability.2) Risk sources are identified during construction process of concrete filled steel tubular tied arch bridge of integral lifting and installation based on construction operation program decomposition results. Structure and personnel safety risks are considered. Construction safety risk source investigation list is obtained,which ensures comprehensiveness of risk source identification. Both triangular fuzzy number and LEC method are used to identify the significant risk sources during construction of concrete filled steel tubular tied arch bridge of integral lifting and installation, which enhance the reliability and operation of the identification process.3)With significant risk source of concrete filled steel tubular tied arch bridge of integral lifting and installation as the research object, bayesian network is used to solve risk probability of construction and risk probability level is obtained. Fuzzy comprehensive evaluation method is used to determine construction risk loss level. According to different combination of risk probability level and risk loss level, risk matrix method is used to evaluate significant risk source. Assessment process of "highwaybridge and tunnel engineering construction safety risk assessment guide(Trial)" is subjected and the accuracy of evaluation result is higher than the "guide".4)Risk coping strategies and principles of risk control are presented combining with the characteristics of risk analysis on concrete filled steel tubular tied arch bridge of integral lifting and installation based on risk assessment results. Foundation is laid to formulate feasible risk control measures.5) Risk sources are identified based on the project as risk analysis object through triangular fuzzy number and LEC method. Risk sources and overall risk of the project are evaluated according to risk rating standard. Risk control measures are presented. Risk analysis process of concrete filled steel tubular tied arch bridge of integral lifting and installation is established. Rationality and reliability of risk analysis process is verified.