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:
  • Energy absorption
  • Guardrails
  • Posts
  • Dynamic tests
  • Impact tests
  • Lateral supports
  • Embedment (Building)
  • Anchoring
  • Highway safety
  • Roads--Guard fences--Testing
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• 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.
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• Format:
  PDF
• Funding:
  SPR-P1(12)M318
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25598/dot_25598_DS1.pdf
• File Type:
  [PDF - 3.67 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:e8591476840ba5708df10b21c8e43ada45f2acb1b7d3f2f50cd5f696515bb55e312fe52e823fe89a08d367416bf760c81300448856a6544b7ababda1bb328c63