Research On Mechanical Property Of Long-span Buried Corrugated Steel Arch Bridge

The long span buried corrugated steel arch bridge structure consists of corrugated steel, and this flexible corrugated steel structure has high strength, low cost, fast construction, excellent mechanical properties, etc.. Our country, however, are still lack of standard specifications for design and construction about this structure. Therefore, it is of great importance that the mechanical behavior and design methods about this structure should be intensively studied.The research contents and results, which on the basis of an actual design, are as follows:(1)The methods of calculating the buried corrugated steel arch bridge w ere intensively analysed by using ANSYS finite element, the results show that both two-dimensional finite element model and three-dimensional finite element model are available for calculating this structure. The result of MPC of three-dimensional analysis, which can solve the nodes coupling problem caused by different freedoms between element types, is less conservative than that of contact analysis considering slippage between the interface of different element types.(2)The suitable finite element analysis way was chosen when intensively calculating the construction stage, the using stage, unfavorable conditions, influence of parameters and stability, and the results are as follows:The stress and deformation of the structure vary greatly during the construction stage. The apex of arch produces upward deformation in the beginning period of construction stage, but it goes downward while the construction continues. Both the deformation of the apex of arch and the stress of the arch springing reach highest after the last stage of construction. The unsymmetrical backfill construction affects the stress of the steel. The effect of the structure produced by th e live load, temperature load and the support displacement are approximately, but lower than that of self weight.The adaptation to the temperature and the support displacement of the structure is excellent, and so the mechanical property is. The properties of the soil effects the structure greatly, and the stress of the structure decrease s when the depth of the steel increases. The stability of the structure stays well in each stage, but the construction loads have great influence on the structure, which s hould be paid more attention on during construction.The soil-arch effect exists when considering their joint force, also, both the displacement and force of the arch structure and foundation decrease. Compared with traditional arch bridge, the requirement of the foundation is less strict when the soil-arch effect exists.(3)The suitable design method about the actual engineering structure in this paper was proposed for this buried corrugated steel arch bridge after the comparison and summary of different foreign design codes. Also, the deformation limite about the structure was put forward after combining the finite element analysis in the paper, which replenishes current design codes. The methods and ideas in this paper also adapt to other form of corrugated steel structures, which provides a certain value reference on research of the structure.