Study On Risk Assessment For Continuous Rigid Frame Bridge With Super High-pier During Construction

In recent years, continuous rigid frame bridge with super high-pier has developedgreatly in highway of mountain area. With the increase of height and span, manyuncertain factors have been arisen, and the construction is faced with unprecedentedhigh risk, which should be paid more attention to. This paper based on ’Study on Designand Construction Key Technology of Continuous Rigid Frame Bridge with SuperHigh-Pier of Hezhang Bridge’(2010-122-017), which is the technology project ofGuizhou Provincial Department of Transportation, researched of risk assessment forcontinuous rigid frame bridge with super high-pier during construction, and the contentsare presented as follows:①Researched on the theory of risk assessment for continuous rigid frame bridgewith super high-pier during construction, the conception of risk and the principle of riskassessment were discussed, the definition of risk and the methods of risk assessmentwere put forward, and the classify and procedure of risk decision about constructionwere introduced.②Put forward to adopt analytic hierarchy process and fuzzy synthetic evaluation,introduced the basic principle of the two methods, introduced the procedure of the twomethods and calculation program of risk weight was developed.③According to the characteristic of continuous rigid frame bridge with superhigh-pier on construction, proposed that risk assessment for pier and girder separatelyfirst, then risk assessment for the general structure. Summarized the common riskfactors of continuous rigid frame bridge with super high-pier during construction andclassified them. The risk assessment system during construction was established byanalytic hierarchy process and fuzzy synthetic evaluation. Proposed risk decision basedon ALARP.④The risk assessment system for continuous rigid frame bridge with superhigh-pier was applied in Hezhang bridge of Guizhou province. Proposed to adopt expertsurveys and numerical simulation of ANSYS to analysis the risk of constructiontechnique to determine the risk level of construction and provided the basis for riskcontrol. Risk decisions for single risk factors were proposed.