Analysis Of Mechanics Property In Simulation Test Of Thin-walled Curved Box Beam

With rapid developing of the high grade highway and the city orbit transportation in recent years, various kinds of curve beam bridge structure are already extensively adopted by our country. The concrete thin-walled curved box beam plays the important role, because it has the good whole space property and the good stability function, adapting various modern construction methods such as the incremental launching method and the erection by protrusion method. The foundation research work such as the warping, the distortion, and the shear-lag effects etc of the thin-walled curved box beam which is a kind of structure system have not yet been carried on systematically so far.This text bases on the computer simulation theory, applying the program of ANSYS, choosing a spatial unit that has 8 node and 24 degree of freedom compose finite element model, adopting parameters to set up the mold of method, building up the thin-walled curved box beam entity space calculation model of the true size. By changing the parameter, we can imitate various thin-walled curved box beams.This text discusses the thin-walled curved box beam calculation theories of the warping, the distortion, and the shear-lag effects etc, mainly analyzing effect of the curvature radius, the ratio of height to radius, the ratio of height to width, the thickness of box, the boundary condition and the material function. Resolution enunciates under the load of bent, the mainly influencing factors of the shear-lag are the curvature radius, the ratio of height to radius and the boundary condition;under the load of rotations ,the mainly influencing factors of the warping angle are the curvature radius, the ratio of height to radius, the thickness of box and the boundary condition;the mainly influencing factors of the buckling are the ratio of height to radius, the thickness of box, the ratio of height to width and the boundary condition;the mainly influencing factors of the distortion angle are the ratio of height to radius, the thickness of box and the boundary condition. This text analyzes the effect of these main factors to the warping, thedistortion, and the shear-lag, giving some conclusion .And a new finite element for thin-walled curved box beam analysis is proposed in the paper. It includes the warping, the distortion, and the shear-lag effects as well as the interactions among them. The thin-walled box beam theory is combined with the finite element technique to provide a formulation of the element stiffness matrices under converted cylinder coordinates.