Reliability Research Of Cable-stayed Bridge Without Back-stays Under Ultimate Strength Limit State

Clear conceptions and simple designs will be provided in design, construction andmanagement of bridge if the mean parameters instead of the primitive system were adopted tocarry on deterministic analysis. However, there are many uncertain and random factors inbridge, what’s more these factors exist in every stage of the service life of a bridge,consequently, the effects of these random factors will be reduced, and which may result inmisjudge on bridge structure. Reliability design methods based on probability theory inconsideration of a large number of uncertain, random factors, and effectively solve the aboveproblem. Unified Standard for Reliability Design of Engineering Structures (GB50153-2008)also makes it clear that the engineering structure design should adopt the limit state designmethod based on probability theory. The main contents include the following aspects:1: In this thesis the research status of reliability theory was refined the basic theory ofreliability from both components and systems, and summarizes its application in cable-stayedbridge from the aspects of ultimate strength limit state, serviceability limit state andconstruction period. But looking from the material collected, very little information about theresearch of reliability on cable-stayed bridge without back-stays is available;2:The characteristic of overall, partial static equilibrium and the relationship of twoaspects about cable-stayed bridge without back-stays was researched; the paper detailintroduces the key technologies of finite element modeling process, and the correspondingfinite element model was established based on ANSYS platform;3: Performance function of cable-stayed bridge without back-stays’ main girder,stayed-cable and inclined pylon under ultimate strength limit state was set up; the maincomponents’ reliability index and the sensitive of the corresponding components’ parameterswere analyzed;4: Aiming at the various failure modes in cable-stayed bridge without back-stays analysis,By using the β-unzipping method and the limit state equation of similar units has the highcorrelation coefficient that can use the equivalent substitution minimal simplified theequivalent structure system. Finally, shows the series, hybrid equivalent system of theexperimental project after simplification, and analyzed its reliability index and failureprobability by applying the two principles...