Effects of Superstructure Components on CWR Track Buckling

Track buckling is formation of large lateral misalignments mainly due to high compressive thermal stresses in continuous welded rail (CWR) tracks and often results in catastrophic derailments. Recognizing the actual behavior of this phenomenon requires complex interaction simulation of track components in vertical, lateral and torsional modes; however, most studies have restricted themselves to either vertical or horizontal planes, to make the analysis tractable. In the present study, the effects of track components including rails, sleepers, fastening systems and ballast materials on lateral stability of CWR tracks are determined, utilizing a developed 3D model. The validity of the model is verified through comparisons with CWERRI program results and other experimental works. Parametric studies have been conducted for both straight and curvilinear tracks. The results indicate that both parameters of ballast lateral resistance and type of rail have considerable influences on railway buckling behavior. Moreover, torsion stiffness of fastening system, type of sleeper and ballast stiffness in vertical and longitudinal directions have lower impacts.

Keywords: Buckling; Stability; CWR; Track; Superstructure; Temperature