Abstract
An important role in the market of transport services belongs to container transportation. Railroads, especially under the conditions of increased competition from road transport, must respond quickly to the needs of the market and the growing demand for container transportation, including interstate traffic. Demand for container transportation can vary significantly during the year, which testifies to the expediency of introducing removable equipment on universal railroad freight cars that are involved in the deliveries of containers. This paper reports the design of a removable frame structure for a universal platform that could carry two 20-ft or one 40-ft container. The proposed technical solution does not require changes in the structure of the car and changes in its model; with a decrease in the demand for container transportation, it would allow this car to be used for its main purpose.
 According to the current methodology, the efforts that operate on the frame during the transportation of containers have been determined. The strength of the proposed structure was estimated by a finite-element method. The maximum stresses arising in the proposed structure are 164.4 MPa; they occur in the corners of the stops attached to the stand-up staples of the platform. The resulting stress values do not exceed the allowable ones. The results of calculating the removable equipment indicate its sufficient strength. Requirements for placing cargo on the rolling stock assume a mandatory check to fit the dimensions, which confirmed that the container hosted by the frame does fit them. The proposed structure makes it possible to abandon disposable fastening parts, improve the safety of container transportation, and increase competitiveness in the container transportation market.
Highlights
A wide range of cargoes transported by rail requires a significant variety of types of freight cars
Assessment of the strength of the proposed analysis of the literature, we considered the assessment of structure the possibility of using removable equipment in terms of its
A structure of removable equipment has been proposed in the form of two connected welded semi-frames, which makes it possible to carry large-tonnage containers, 20 and 40 feet long, without making changes to the structure of the universal platform wagon
Summary
A wide range of cargoes transported by rail requires a significant variety of types of freight cars. The competitive market of transportation services requires taking into consideration all components that affect the final cost of cargo deliveries. The most important direction in the development of railroad car construction is the transition to such economic and progressive structures that meet the modern requirements of the transport services market. Improving the efficiency of railroads in general, in many ways, is associated with an increase in container transportation. A relevant task is to transport containers on universal platforms without the use of disposable fasteners and to improve traffic safety. This creates preconditions for increasing the competition in the container transportation market and for reducing the cases of container displacement during transportation because of unreliable fastening parts
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