| 摘要 |
Coupling webs are provided for an upright assembly that functions so that there is a high stress concentration for horizontal impact loading while providing zero or low stress concentration for wind or tensile loadings. At least one web is provided with at least one vertical groove in it, and at least one through-extending transverse opening adjacent one end of the groove and providing the end termination of the groove. A portion of the web on one side of the opening is connected to a generally vertical upright member, while the portion of the web on the opposite side of the through-extending opening is connected to a generally vertical base member. A sign preferably is provided on the upright member, and the web may be disposed in a plane generally parallel to the sign.
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