Establishment method of one-dimensional beam unit model of curved steel-concrete combined box beam

Abstract

The invention discloses an establishment method of a one-dimensional beam unit model of a curved steel-concrete combined box beam. The method comprises the following steps: S1, selecting a coordinatesystem oxyz of a box beam; S2, based on the coordinate system, according to a torsion warping displacement function, calculating the displacement mode and the strain component of the combined box girder, wherein the displacement mode comprises longitudinal displacement, tangential displacement and normal phase displacement; S3, calculating to obtain a balance equation of the composite beam througha virtual work principle; and S4, establishing a finite element equation of the curve composite beam through the balance equation. The model is established by adopting the method, so that the subsequent calculation accuracy is higher, and the defect that the complex mechanical effects such as constraint torsion, distortion and interface bidirectional slippage of the curve composite beam are generally difficult to comprehensively consider in the existing research is overcome.

Description

technical field [0001] The invention relates to the technical field of bridge structure analysis, in particular to a method for establishing a one-dimensional beam unit model of a curved steel-concrete composite box girder. Background technique [0002] Composite bridges refer to composite bridges with girder spans as the basic structure. After two or more systems overlap, the reaction force properties of the overall structure are still the same as those of beams loaded by bending. The characteristics of this type of bridge are mainly manifested in the heavy design calculation work, complex structure details and internal forces. In recent years, curved steel-concrete composite girder bridges have gradually become one of the main types of bridges for urban construction due to their light weight and short construction period. Compared with straight beams, due to its own structural characteristics, curved composite beams have obvious bending-torsion coupling phenomenon, that i...

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Problems solved by technology

In the prior art, for the numerical analysis of curved beams, the three-dimensional fine finite element model is generally used to consider its mechanical behavior, but the modeling process is complex and has high requirements for computer performance, so it has relatively low analysis efficiency. At the same time, For curved beams with large curvature, the ratio of beam axis radius to beam width is less than 10, the change of curvature radius along the beam width direction and the effect of shear lag also need to be considered; and tangential slip behavior, however, the above behavioral changes have not been considered in the existing numerical analysis

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