United States Department of Transportation
i
Development of socketed foundations for S3X5.7 posts.
-
2015-04-01
-
[PDF-15.31 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:The objective of this study was to develop a socketed foundation for use with the S3x5.7 (S76x8.5) weak
post. The design focused on cylindrical, reinforced concrete foundations with a steel tube placed in the center for
use as the socket. The foundation was to prevent both damage and displacements exceeding 1 in. (25 mm), as
measured at groundline, during an impact event. To evaluate various foundation designs, ten dynamic bogie tests
were conducted over three separate rounds of testing. Round 1 was conducted in a weak, sandy soil; Round 2
was conducted in a strong, stiff soil; and Round 3 was conducted within a 4-in. (102-mm) thick asphalt pad.
The results of the bogie testing led to the development of three socketed foundation design options. Option 1
consisted of a 12-in. (305-mm) diameter foundation; Option 2 was a 15-in. (381-mm) diameter foundation; and
Option 3 was a foundation installed within an asphalt mow strip. Option 1 carried a risk of concrete damage
during severe impacts, but it was included for those agencies wishing to be more aggressive and accept the risks
of damage. Each design option had a unique reinforcement configuration and minimum embedment depth.
Further, the recommended minimum embedment depths were also a function of the surrounding soil conditions
and the frost line depth of the installation site.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
