| Concrete-filled steel tubular (CFST) arch bridge has been widely used in China.Because the pressure is the dominate forces in the structure, therefore with the rise ofstrength of materials and enlargement of the span, more concern has focused on thestability problem of this kind bridge, especially the out-plane stability problem, Soresearches on the non-linearity characteristics and ultimate stability load-carryingcapacity of CFST arch under spatialloads seems quite necessary. An experiment on the whole process of the CFST (single tube) single rib archunder spatial loads has been carried out. By comparison with the behavior of modelarch under in-plane loads and dual rib arch under spatial loads, the test results havebeen analyzed to understand the behavior of CFST arch under spatial loads. Thisunderstanding will help to establish dual none-linearity finite element analysis methodof such arch bridge. An attempt has been make out to use the universal ANSYS software to analysisthe dual-nonlinearity properties of CFST arch. Used this method, the CFST modelarch (both single and dual rib) under spatial loads were analyzed. Based on the former research works and the program dealing with thedual-nonlinearity of CFST arch subjected to in-plane load developed by FuzhouUniversity, a method of dual non-linearity FE method and program to analyze CFSTarch under spatial loads has brought forward. In this method, spatial beam element(three dimensional) substitute the in-plane one (two dimensional). A properstress-strain relationship model of CFST material under complicated conditions, i.e.,compression, bending as well as torsion, has been selected. From the comparisons ofthe several present methods, it shows that the analytical results by the present finiteelement method in this paper agree the most well with the test results. The research works by this paper will provide a base for the further research onthespatial stabilityultimate load-carrying capacity of CFST arch. |
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