Analysis of the Effect of Heavy Duty Freight Cars Loaded Overweight Goods on the Track Structure

Abstract

Overweight goods are kind of special goods and must be loaded on the heavy duty freight cars when transported by railway. However, this sort of car is not taken consideration when the track structure is designed. In order to have knowledge regarding the action of the heavy duty freight cars on the track structure and correctly organize the transportation of the overweight goods, the strength of track was studied with the action of the heavy duty freight cars according to the basic theory of static mechanical calculation. Taking the D2 car as an example of heavy duty freight cars and selecting the traditional track of railway, the finite element calculation model of track was established. With the software ANSYS, the forces and deformations of track structure were calculated under several parameters and conditions of different load position, spring rigidity coefficient and rail type. Then, the D32, D38 type of heavy duty freight cars and several common locomotives were selected and the forces and deformations with these loads were calculated and compared. The results show that the static extrema of forces and deformations of track structure have different laws under different parameters and conditions. The heavy duty freight cars loaded overweight goods generally make the track structure engender greater forces and deformations than those common locomotives do, and the D2 car is of all the most adverse to the track. This indicates that heavy duty freight cars probably bring the bad effect to the lines. Therefore, when transporting overweight goods loaded on the heavy duty freight cars, adaptable measures and correct transport scheme are to be taken to decrease the damage to the lines.