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We have a contractor that wishes to use 3/4" x 6.25" carbon steel wedge anchors verses epoxy anchors for the details MwRSF developed in TRP-03-114-02 and TRP-03-278-13.
Contactor indicates the following in their submittal
Arbor Green would like to use a mechanical wedge
|Date||July 28, 2016|
|Attachment||Wedge Anchor Data Sheet.pdf|
|Response||The attached detail showed an anchorage that was dynamic component tested in report TRP-03-278-13. It consisted of 1" dia. A307 bolts anchored into a minimum of 4,000 psi concrete to a depth of 8" using an epoxy with a minimum bond strength. The dynamic testing found that this configuration was capable of developing the moment capacity of the post and was acceptable for use with the previously crash tested culvert mounted guardrail system.
The original anchorage consisted of 1" dia. A307 bolts that were through bolted into the top of the culvert. In order to be conservative and in lieu of dynamic testing, we have required that any alternative anchor must meet the ultimate capacity of the as-tested design. For the 1" dia. A307 bolts, that would correspond to an ultimate tensile load of 36.4 kips.
The proposed TruBolt wedge anchors do not appear to have sufficient capacity. 3/4"dia. TruBolt wedge anchors have a maximum capacity of 17.7 kips at the length/embedment noted above in 4,000 psi concrete. Even the largest diameter TruBolt wedge anchors only develop 26.5 kips in 4,000 psi concrete. Thus, we are unable to recommend the alternative anchor at this time.
It may be possible that the TruBolt anchor could function acceptably, but some form of dynamic component testing would be needed to verify the performance similar to report TRP-03-278-13.
|Date||July 28, 2016|
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
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