Research on Static and Dynamic Performance of Heavy-Haul Railway Single Track 32m Steel Concrete Composite Beams
To promote the rational use of small and medium-sized steel-concrete composite beams(which are light self-weight,fast and convenient construction,and good economy)in the field of heavy-haul railways,this article focused on the static performance of a 32 m steel-concrete composite beam on a single track heavy-haul railway by using a universal finite element method.The dynamic performance of the vehicle rail bridge coupling was studied using a rigid-flexible coupling multi body dynamics method.The research results indicate that:(1)The 32 m steel-concrete composite beam of a single track heavy-haul railway(30t axle load)can adopt a 2.6 m I-shaped steel beam,with a bridge deck thickness of 20 cm(horizontal support point of 40 cm)and a double I-shaped steel composite cross-section.(2)The torsional stiffness of the double I-beam steel-concrete composite beam is relatively weak,and the influence of section distortion deformation should be considered when calculating lateral deformation.(3)The spacing between the transverse beams should be determined based on the structural stability during the construction phase,and should not be too dense.(4)When the train speed is less than 80 km/h and the axle load is less than 40 t,the dynamic response of train and bridge are all within the allowable range of the specifications.Comprehensive research has shown that the use of small and medium-sized steel-concrete composite beams in the field of heavy-haul railways is feasible,and the research results can provide reference for similar projects.
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