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· From MwRSF TestTRP-03-276-13, the following three (3) images are provided, as a quick sample –
Are clipped post bolts recommended (or allowed) for use in the MGS?
|Date||March 22, 2017|
|Attachment||20170322 SC & MI Clipped Post Bolt HD.PDF|
With respect to the clipped bolts, we don’t believe that these should pose an issue. We have not typically tested the MGS with clipped bolts in the past. However, the shape of the ovalized shoulder on the bolt forces the bolt to be installed such that the rounded sides of the bolt head overlap the top and bottom edges of the guardrail slot similar to a circular dome head bolt. Thus, release from the middle region of the guardrail slot should be similar for the clipped head bolt. A clipped head bolt may have slightly less overlap on the edge of the guardrail slot as compared to a circular dome head bolt if the bolt is positioned at either end of the slot. However, this release load would still be equal or greater to either bolt head near the middle of the guardrail slot. As such, I don’t anticipate an issue using the clipped head version of the bolts with the MGS, and believe that either the standard round head or the clipped head would function acceptably.
It should be noted that the shoulder should be oriented perpendicular to the clipped sides of the bolt. Orientation of the shoulder parallel to the clipped sides would prevent effective attachment of the guardrail to the post.
|Date||March 23, 2017|
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