The rideability of a deflected bridge approach slab (LTRC project 02-2GT continuation : phase II) : [tech summary].
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The rideability of a deflected bridge approach slab (LTRC project 02-2GT continuation : phase II) : [tech summary].

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      DOTD has made attempts to use the standard international roughness index (IRI) to index bridge bumps. However, it was

      discovered that IRI has problems indexing localized roughness. A research eff ort was undertaken to investigate if there might

      be a means to overcome the aforementioned problem. As a result of this eff ort, completed in 2009, DOTD was able to develop

      the Posted-Speed Localized Roughness Index (LRIPS), which attempted to overcome the problems by returning to a response-type road roughness measuring systems (RTRRMS) approach. It was then discovered that the LRIPS could isolate the positions

      of localized roughness phenomena. However, with it being an RTRRMS, it did suff er from “transportability” and “suspension

      degradation” problems, which prevented it from being a tool adequate for measuring distress magnitude. The profi ling

      community had also recognized that the standard IRI has problems coping with localized roughness. Through their eff orts, the

      so-called 25-ft. moving base-length method of evaluating localized roughness (IRI25-ft) was developed. Louisiana’s attempts to

      use the IRI25-ft approach met with some diffi culty, however. While the IRI25-ft methodology

      indexed bumps adequately, DOTD had diffi culty using it to locate the position of bumps on

      the pavement. This research sets details as to how the IRI25-ft method and the LRIPS method

      can be used in a complementary fashion to overcome the limitations of each.

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