United States Department of Transportation
i
Post weld and epoxy anchorage variations for w-beam guardrail attached to low-rill culverts.
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2013-08-01
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[PDF-5.10 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION
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Abstract:The research effort consisted of two objectives for dealing with alterations to the W-beam guardrail system developed
for attachment to the top of low-fill culverts. This effort included: (1) investigation of an alternative weld detail to simplify
the three-pass fillet weld on the front flange of the post and (2) development of an epoxy anchorage option as opposed to
through-bolting. These system modifications were evaluated through four dynamic, bogie tests conducted under the same
impact conditions as the original system component testing.
Based on a survey of the Pooled Fund member states, two different single-pass weld details were evaluated as a
replacement for the 3-pass fillet weld used on the front flange of the post in the original system. However, both single-pass
welds resulted in large tears in the base plate adjacent to the front flange. The 3-pass weld detail was successful with a post
assembly fabricated from 50 ksi (345 MPa) steel materials. Thus, the 3-pass weld will continue to be recommended for use,
while the post and base plate may be composed of ASTM A36 or Grade 50 steel parts.
Anchor pullout was encountered for an embedment depth of 6 in. (152 mm), while an 8-in. (203-mm) embedment
showed no signs of anchor failure. Thus, an 8 in. (203 mm) minimum embedment depth was recommended for the epoxied
anchorage design.
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