Dynamic testing of MGS W6x8.5 posts at decreased embedment.

Details

• Creators:
  Schmidt, T.L. ; Mongiardini, M. ; Bielenberg, R.W. ; Lechtenberg, K.A. ; Reid, J. D. ; Faller, R.K.
• Corporate Creators:
  Midwest Roadside Safety Facility
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Anchoring Dynamic Tests Embedment (Building) Energy Absorption Guardrails Highway Safety Impact Tests Lateral Loads Lateral Supports Posts Roads--Guard Fences--Testing

  More +
• Publication/ Report Number:
  TRP-03-271-12
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Edition:
  Final report.
• Corporate Publisher:
  Nebraska. Dept. of Roads
• Abstract:
  The objective of this study was to evaluate and compare the energy absorption characteristics of W6x8.5 (W152x12.6)
  
  posts at a reduced embedment depth of 36 in. (914 mm) to that of the standard 40-in. (1,016-mm) embedded W6x8.5
  
  (W152x12.6) posts used in the original Midwest Guardrail System (MGS). A total of eight dynamic component tests were
  
  performed – two tests with the 40-in. (1,016-mm) embedment depth and six with a 36-in. (914-mm) embedment depth. For
  
  two of the six 36-in. (914-mm) embedment tests, the load height was increased from 24 in. (632 mm) to 28⅞ in. (733
  
  mm). The posts were embedded in a highly compacted, coarse, crushed limestone material. For each test, acceleration data
  
  was used to determine the force vs. deflection and energy vs. deflection characteristics of the various post installations.
  
  Post-soil interaction forces and energy dissipation characteristics of the steel posts with a 36-in. (914-mm) embedment
  
  depth were compared to those for the steel post used in the original design of the MGS in both moderately and highly
  
  compacted soil. From these comparisons, the post with a 36-in. (914-mm) embedment depth was found to provide similar
  
  strength to that of the W6x9 (W152x13.4) steel post with a 40-in. (1,016-mm) embedment depth and installed in moderately
  
  compacted soil. In highly compacted soil, the post with a 36-in. (914-mm) embedment depth exhibited less resistance than
  
  the post with a 40-in. (1,016-mm) embedment depth. Therefore, the dynamic resistance of the W6x8.5 (W152x12.6) post
  
  with a 36-in. (914-mm) embedment was determined to provide enough resistance to be used with the MGS, which may
  
  allow a potential increase in the maximum rail mounting height of the MGS.
  
  
• Format:
  PDF
• Funding:
  SPR-P1(12)M318
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:0893a0d2ae7134f70e5628cc98daf01a40b6a729ac5fcbb9a21778b3869d5714
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25598/dot_25598_DS1.pdf
• File Type:
  [PDF - 3.67 MB ]