| 摘要 |
An hollow railroad car may be a have a lading containment structure that is a pressure vessel. The car may be a covered hopper car having one or more hopp er discharge sections. Each hopper discharge section may include a transition from a substantially rectangular upper inlet to a substantially circular outlet. The transition m ay include developed plate formed as partial conic sections fitted as valleys between respective pairs of fore-and-aft slope sheets and side slope sheets. The car may have substantially planar internal ring reinforcement assemblies that serve to form a jig and a weldin g surface for the fore-and-aft slope sheet, a self-jig for the skins of the side wall and roof sheets, and which define buckling nodes for longitudinal compression of the car. The rings for m local T--sections in combination with the adjacent wall skins, and do not employ out-of-plane formed sections such as hat sections. The reinforcement may be fabricated from flat sheet or flat bar.
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