An interaction modeling method for a large-span composite beam cable-stayed bridge and a ballastless track of a high-speed rail

Abstract

The invention discloses an interaction modeling method for a large-span composite beam cable-stayed bridge and a ballastless track of a high-speed rail. The method comprises the following steps: S1, establishing a large-span cable-stayed bridge model and simulating a beam unit for a composite beam; S2, establishing a ballastless track model; A track plate and a base plate are simulated by adoptingnonlinear fiber beam units, steel rails are simulated by adopting beam units, longitudinal and transverse resistances of fasteners are simulated by adopting nonlinear springs, an elastic cushion layer is simulated by adopting nonlinear springs, and shear nails and pier top anti-thrust rigidity between the track plate and the base plate and between a convex blocking table and a bridge are simulated by adopting linear springs; And S3, temperature, vertical live load and train braking are applied to the ballastless track model, and the stress law of steel rails, track plates and base plates in the model is studied. The method can further enrich a ballastless track design theoretical system, and provides a scientific basis for improvement of bridge and ballastless track design and maintenancetechnical standards.

Description

technical field [0001] The invention relates to a modeling method involving the interaction between a bridge and a ballastless track, in particular to a modeling method for the interaction between a high-speed rail long-span hybrid girder cable-stayed bridge and a ballastless track. Background technique [0002] The ballastless track structure has the advantages of good integrity, good stability, corrosion resistance, can effectively reduce the maintenance of the track, and the track geometry is easy to maintain. It is widely used in small and medium-span high-speed railway bridges in my country. However, for long-span bridges, the large temperature span of the bridge causes the steel rails to bear huge longitudinal force and temperature force, and the soft structural system of long-span bridges leads to large deformation at the corner of the beam end. Ballasted track structures are often used. However, the running smoothness and durability of the ballasted track are lower ...

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