VEHICLE BODY STRUCTURE

PROBLEM TO BE SOLVED: To provide an excellent ride quality performance of a railroad vehicle by improving the bending rigidity of a body structure while suppressing an increase of the weight of the body structure as much as possible. SOLUTION: A strength plate 7 is affixed to an inner side of a roof body structure 1 in a center portion of the longitudinal direction of a railroad vehicle body structure 10 comprising the roof body structure 1, a side body structure 2, an underframe 3, and a gable body structure 4. A longitudinal affixing range of the railroad vehicle body structure 10 of the strength plate 7 is between two body bolsters 6, and the right-to-left affixing range of the roof body structure 1 is about one half of the length in the right-to-left direction of the roof body structure 1. The thickness of the strength plate 7 is increased as the vertical height of the roof body structure 1 is increased. In this structure, the deformation of the roof body structure 1 in the center portion of the longitudinal direction of the railroad vehicle body structure 10 causing a large deformation can be suppressed, and the bending rigidity of the railroad vehicle body structure 10 can be efficiently enhanced. In other words, the vertical bending vibration of the railroad vehicle is suppressed, and the excellent ride quality performance is provided. COPYRIGHT: (C)2008,JPO&INPIT