Research On Structural Behavior Of "Fly-Bird-Type" CFST Arch Bridge

"Fly-bird-type"Concrete-filled steel tubular (CFST) arch bridge, or half-through rigid frame arch bridge, is a half-through CFST main arch fixed on the piers with two half-cantilevered deck arches, tied by the pre-stressed steel bar at the ends of the side spans. Since San-shan-xi Bridge in Nanhai, Guangdong, built up, about twenty of such bridges have been built and the spans become larger and larger. In spite of many analysis on individual bridges have been carried out, however, systemic and thorough research on this type bridge is lack. So it is necessary to sum up the practical experiences and have a systemic research of structure behavior of "fly-bird-type"CFST arch bridge. Plenty data about "fly-bird-type"CFST arch bridges are collected and some typical bridges are introduced. The common value of typical design parameters, the constructions of structure and the erection techniques are summarized. Then two simplified equation of this bridge type under dead load are put forward. The calculation method of finite element is also introduced. All these above contribute a lot to the engineering application. Dongguan Shuidao Bridge, a "fly-bird-type"CFST arch bridge, is taken as an case study. Finite element method is adopted for checking computations of the structure behavior during construction and after completion. These academic data greatly help the project construction successfully. Meanwhile, the structural behavior of such bridge can be found out through this case study on the static behavior, stability property and dynamic characteristics of Dongguan Shuidao Bridge. Dual none-linearity finite element method is used to analysis the whole behavior and ultimate load-carrying capacity in plane of Dongguan Shuidao Bridge. In the analyses, the whole behavior, the influence of non-linearity, failure model and the influencing factor of ultimate load-carrying capacity in plane are analyzed.