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From page 4...
... 4 1 INTRODUCTION 1.1 Problem Statement The use of MSE retaining walls in highway applications has increased over the last decades. According to the Federal Highway Administration (FHWA)
From page 5...
... 5 corresponding nominal vehicle weight, impact velocity and impact angle defined in the new MASH specifications. Table 1-1 MASH designation and impact conditions (5)
From page 6...
... 6 large truck impacts. This research will extend the work accomplished under NCHRP Report 663 and eliminate the need to extrapolate knowledge from a TL-3 impact to a TL-4 and TL-5 impact.
From page 7...
... 7 Figure 1-1 Sketch of an MSE retaining wall with a BMS system (2)
From page 8...
... 8 1.3 Research Approach The research plan for developing, analyzing, and validating procedures for designing roadside barrier systems placed on MSE walls, subjected to TL-3, TL-4 and TL-5 impact conditions, consists of eight tasks divided into two distinct phases, as outlined below. 1.3.1 Phase I: Analytical Study Phase one of the project includes the following tasks: Task 1.
From page 9...
... 9 conducted in task 3. The results of the analyses will help in drafting the preliminary guidelines for designing barrier-foundation systems and MSE wall for TL-5 impacts.
From page 10...
... 10 - Chapter 3 starts with a revision of the impact load for TL-3 and then investigates the magnitude and distribution of the impact loads imposed by heavy vehicle collision against traffic barriers. Recommendation of design loads for TL-4 and TL-5 impact are included in this chapter.

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