| 摘要 |
A structural assembly defining a corner of a doorway for a railway boxcar in which a square-cornered doorway opening is provided and yet stress concentrations are avoided. A corner connecting member interconnects upright and horizontal doorway frame structures, but instead of including an angular intersection of vertical and horizontal surfaces defining the doorway opening, the corner member includes an arcuate concave connecting surface extending between the upright and horizontal surfaces defining the doorway opening. The arcuate concave connecting surface is located outside the doorway opening and extends around the location where the vertical and horizontal surfaces would intersect, so that there is no angular intersection to concentrate stresses. An insert fits matingly along the arcuate concave connecting surface and has an inside corner defined by surfaces that are located to extend the vertical and horizontal surfaces and define the corner of the doorway opening. The insert is held in place by a single fastener that avoids concentration of stresses in the insert.
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