Development of socketed foundations for S3X5.7 posts.

Details

• Creators:
  Rosenbaugh, Scott K. ; Schmidt, Tyler L. ; Faller, Ronald K. ; Reid, John D.
• Corporate Creators:
  Midwest Roadside Safety Facility
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Barriers (Roads) Foundations Highway Safety Impact Tests Posts Reinforced Concrete Steel
• Publication/ Report Number:
  TRP-03-293-15
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Midwest States Regional Pooled Fund Program
• 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:
  PDF
• Funding:
  TPF-5(091) Supplement #2;TPF-5(193) Supplement #19
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:7f5aa0693726771cbbdd5a6fc922aa4cf9518f8fdf2f8dc4a8d23a9c0952916589ebace682da395f0dfa4e7c14354291e7eb79954a9ce790f9310af9d16bc6c6
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29350/dot_29350_DS1.pdf
• File Type:
  [PDF - 15.31 MB ]