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

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  • English

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      Final report.
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    • NTL Classification:
      NTL-SAFETY AND SECURITY-Highway Safety ; NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION ; NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT ;
    • 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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