Construction And Operation Stability Analysis Of The Concrete-filled Steel Tube Arch Bridge

Due to high bearing capacity,sleek and convenient construction and many other advantages, the concrete-filled steel tube arch bridge has been widely used in China.With the continuous development of concrete-filled steel tube arch bridge design theory and construction technology,such bridges are more gentle as the span increases, as the pressure-based structure, stability is becoming one of the key factor which restrict its development.On the basis of the concrete-filled steel tube arch bridge stability calculation theory, this paper take a railway under-supported concrete-filled steel tube arch bridge of 96 m span as the project background, carries on the stability analysis of bridge construction process and its operation stages, the main contents are as follows:(1)Using the software MIDAS/Civil to establish the structure computation model of the under-supported concrete-filled steel tube arch bridge and scaffold, carries on the linear elastic stability analysis of bridge construction process and its stages of working conditions, the stable safety coefficient and unstable mode on various loads are obtained.(2)Carry on the geometrical nonlinear stability analysis of the operation stages,and compared with the linear elastic calculation results in order to research it ’ s influence.(3) The distinction computation analyzed, these are the rungs quantity, form, and rigidity as well as the sloping angle of arch ribs, the effect conservative loading of hanger and so on each kind of factor to arched bridge stable influence, and studies the reasonable value range of the above factors.In view of the above-mentioned researches, some useful conclusions were obtained, that has some referential value for the design and construction of the concrete-filled steel tube arch bridge.