Development of alternative wood-post MGS approach guardrail transition.

Details

• Creators:
  Rosenbaugh, Scott K. ; Schrum, Kevin D. ; Faller, Ronald K. ; Lechtenberg, Karla A. ; Sicking, Dean L. ; Reid, John D.
• Corporate Creators:
  Midwest Roadside Safety Facility
• Corporate Contributors:
  Nebraska. Dept. of Roads ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Barriers (Roads)
  • Wood
  • Highway safety
  • Approach roads
  • Guardrail transition sections Highway safety
  • Dynamic test
  • Bogie tests
  • Roadside appurtenances
  • MASH
  • Wood post
  More +
• Publication/ Report Number:
  TRP-03-243-11
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Edition:
  Final reportt; 2009-2011.
• Corporate Publisher:
  Midwest Roadside Safety Facility
• Abstract:
  The objective of this study was to develop a wood-post MGS approach transition system that is equivalent to the ; simplified steel-post, MGS stiffness transition recently developed at the Midwest Roadside Safety Facility. An extensive ; literature review was conducted on wood and steel post performance comparisons through either dynamic component ; testing or full-scale crash testing. This review concluded that 6-ft (1.8-m) long W6x9 (W152x13.4) steel posts and 6-in. x 8- ; in. (152-cm x 203-mm) wood posts provide similar force vs. deflection characteristics during rotation through soil. ; However, no such data was available concerning dynamic testing on larger transition posts located adjacent to the bridge ; rail. Therefore, a dynamic testing program was undertaken to evaluate W6x15 (W152x22.3) steel posts and various sizes of ; wood posts. At the conclusion of the testing program, an 8-in. x 10-in. (203-mm x 254-mm) wood post was chosen as the ; best equivalent to the W6x15 (W152x22.3) steel post due to similar post-soil resistances as well as a reduced propensity to ; fracture when compared to smaller post cross sections. ; A BARRIER VII computer model was then used to evaluate the wood-post stiffness transition against a calibrated model ; of the original steel post transition system. When subjected to identical impacts, the wood-post system was shown to reduce ; system deflections, vehicle pocketing angles, and the potential for wheel snag. Therefore, the wood-post MGS stiffness ; transition was recommended for use as a MASH TL-3 safety barrier.
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• Format:
  PDF
• Funding:
  TPF-5(193)
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24470/dot_24470_DS1.pdf
• File Type:
  [PDF - 19.42 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b0d92d9024b9cd06d505b5b7fe55080bef2bfad487a7d78a16b41af040abf19ecdcaaa7221bc247411a1d6e02923d538e3d3997c164815ce78c96194b35426f3