Wisconsin DOT had a question regarding the Missouri single-slope approach guardrail transition developed at MwRSF (TRP-03-47-95). In that report, the thrie beam end shoe is anchored to the single-slope with "self-drilling" RedHead anchors and 7/8" A325 bolts. Wisconsin could not find similar anchors available from RedHead, and asked what their potential alternatives would be.
Here is a quick summary of the alternatives for this problem.
The original single slope approach guardrail transition used 7/8" diameter A325 bolts with "self-drilling" Redhead anchors. These anchors had a listed capacity of 20.5 kips in pullout/tension and 24.32 kips in shear. The higher grade bolt was required to address bending of the bolt.
The issue that arises is that this anchorage is no longer made. Thus, we looked through the available alternatives.
The ¾" anchors may potentially be sufficient, but we could not guarantee the same capacity as the originally tested system. Thus, they would require additional research or testing.
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