Method for designing lower combination stiffness of iron base plate of elastic separation type fastener system

Abstract

The invention discloses a method for designing the lower combination stiffness of an iron base plate of an elastic separation type fastener system, and relates to the technical field of track design.The method for designing the lower combined rigidity of the iron base plate of the elastic separation type fastener system comprises the steps of applying loads to a steel rail so that the loads can be transmitted to an under-plate cushion layer through the iron base plate, wherein the iron base plate, the under-plate cushion layer and a sleeper are sequentially arranged in a stacked mode from topto bottom, and the steel rail is arranged on the iron base plate; obtaining displacement data of the under-plate cushion layer and load data of a load loaded on the steel rail, and obtaining a nonlinear load-displacement curve according to the displacement data and the load data; establishing an iron base plate-under-plate cushion layer-sleeper three-dimensional entity finite element model; and importing the non-linear load-displacement curve into the iron base plate-under-plate cushion layer-sleeper three-dimensional entity finite element model so as to calculate the combined rigidity underthe iron base plate. According to the method for designing the lower combination stiffness of the iron base plate of the elastic separation type fastener system, more accurate design result can be obtained.

Description

technical field [0001] The invention relates to the technical field of track design, in particular to a method for designing the combined stiffness of an elastic split fastener system under an iron backing plate. Background technique [0002] At present, in the traditional design method adopted for the theoretical stiffness design of railway elastic split fastener system, the iron backing plate is regarded as a uniformly deformed rigid body for calculation. [0003] However, after the anchor bolts are pre-tightened, the iron backing plate will have a warping deformation of "high in the middle and low at both ends", and then the deflection deformation of "low in the middle and high at both ends" will occur on the iron backing plate when the train passes. Moreover, the underlying layer of the iron backing plate often has obvious superelastic characteristics. According to the traditional design method, the iron backing plate is regarded as a uniformly deformed rigid body for c...

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Problems solved by technology

[0003] However, after the anchor bolts are pre-tightened, the iron backing plate will have a warping deformation of "high in the middle and low at both ends", and then the deflection deformation of "low in the middle and high at both ends" will occur on the iron backing plate when the train passes. Moreover, the underlying layer of the iron backing plate often has obvious superelastic characteristics.

According to the traditional design method, the iron backing plate is regarded as a uniformly deformed rigid body for calculation, which will inevitably cause the design stiffness under the iron backing plate to be inconsistent with the actual

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