Finite element simulation method for plate-truss composite structure of orthotropic steel bridge deck system

Abstract

The invention discloses a finite element simulation method for a plate-truss structure with an orthotropic bridge deck combined with a truss girder. The finite element simulation method comprises: enabling the plate-truss structure with the orthotropic bridge deck combined with the truss girder to be simplified and equivalent to a space truss; establishing a full-bridge unit model I for the space truss by adopting a 3D beam unit simulation method; establishing a full-bridge unit model II for a plate-truss structure with the orthotropic bridge deck combined with the truss girder through the beam-slab unit combination method; taking the full-bridge unit model II as a reference, and calculating the elastic modulus correction of an equivalent cross beam and the elastic modulus correction of an equivalent longitudinal beam of the full-bridge unit model I by adopting an influence matrix method; and substituting the elastic modulus correction into the full-bridge unit model I for correction to obtain a final finite element model. The 3D beam unit is adopted to simulate the plate-truss structure combining the orthotropic bridge deck and the truss girder, the influence matrix method is used for conducting elastic modulus correction on the simplified full-bridge unit model I through the full-bridge unit model II, and the finite element calculation efficiency is improved while the calculation precision is guaranteed.

Description

technical field [0001] The invention relates to the technical field of bridge engineering. More specifically, the present invention relates to a finite element simulation method for an orthotropic steel deck tie-truss composite structure. Background technique [0002] The components of the plate-truss composite structure include the main truss, the bridge deck, and the longitudinal and transverse beams. In this way, the bending and torsional rigidity of the structure will be improved, and it will become one of the ideal types of long-span bridges, especially public-rail dual-purpose bridges. Compared with the traditional steel truss structure, the plate-truss composite structure can effectively reduce the cross-sectional size of the chord, making the cross-sectional form of the main girder more reasonable; while the orthotropic steel deck with light weight and large bearing capacity It is an ideal bridge deck structure. [0003] At present, the commonly used finite elemen...

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Problems solved by technology

[0003] At present, the commonly used finite element simulation method for plate-truss composite structures is the beam-slab element combination method (that is, the deck system is simulated by plate-shell elements, and the truss structure is simulated by beam elements), which can effectively simulate the longitudinal and transverse stiffness of plate-truss structures , is an accurate simulation method, but for super-long-span plate-truss composite structure bridges, there are many structural components. When using the beam-slab element combination method to simulate the full bridge, the performance requirements of the computer are high, and the calculation time is long. Using this When analyzing the construction stage, the decision-making time of construction monitoring is increased, which is not conducive to the rapid development of on-site construction work

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