Triangular Slip base Support with Slip Joint

Report Number(s): 690900-SPF-4

Description: The triangular slip base sign support system consisted of a 24-inch square, 0.080-inch thick aluminum sign panel attached to a two-piece pipe support at a mounting height of 84 inches above grade. An inner HSS square tube was welded inside the lower end of the upper portion of the pipe support. The HSS tube extended beyond the end of the upper portion of the pipe support and inserted into the upper end of the lower portion of the support at a height corresponding to the lower edge of the sign panel. A tab on the HSS support indexed into a slot on the lower portion of the support to prevent rotation. The lower end of the lower portion of the support inserted into a triangular slip base assembly that was connected to a matching triangular slip plate attached to a ground stub embedded in a concrete footer. The height of the lower slip plate was 4 inches above grade. The slip bolts inserted into proprietary bolt retainer plates that were sandwiched between the two triangular slip plates.

Test Level: 3

Eligibility Letter: SS-191

MASH Test Number: 3-60, 3-61, 3-62

Proprietary/Non-proprietary: Proprietary

Pass/Fail: Pass

Evaluation: Full-Scale Crash Testing

Sponsor: Southern Plains Fabrication