Performance of Longitudinal Barriers on Curved, Superelevated Roadway Sections (2019) / Chapter Skim
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Pages 112-117
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From page 112... ...
112 Development of Guidance for Improved Longitudinal Barrier Design, Selection, and Installation on CSRS 7.1 Background This research investigated the safety performance of barriers installed on CSRS with the intent of developing improved guidance for their design, selection, and installation. The literature review, state DOT survey, and analysis of crash data found little specific guidance for the use of longitudinal barriers on CSRS.
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From page 113... ...
113 wheels snagging on posts and may reduce the barrier's ability to contain and redirect the impacting vehicle, thus resulting in vehicle penetration or override of the barrier. Variations in the nature of the impact may increase the impact forces that potentially exceed the load capacity of barriers designed for impacts along tangent roadway sections.
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114 however, addressing them all was beyond the scope of this effort. Therefore, this research focused on these critical or fundamental questions about longitudinal barrier performance on CSRS: • What is the effect of curvature and superelevation on longitudinal barrier performance?
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115 Design Guidance Findings by Topic Implications and Guidance Elements General • Interface areas are a function of the type of vehicle, its speed, the nature of the road, shoulder, and roadside slope surfaces conditions. • There are differences in the interface effectiveness for the three types of barriers.
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From page 116... ...
116 Selection Guidance Findings by Topic Implications and Guidance Elements Curvature and Superelevation • Longer radius curves with lower superelevations tend to have better interfaces with barriers. • Barriers on CSRS with higher superelevations tend to be prone to failures.
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From page 117... ...
117 Installation Guidance Findings by Topic Implications and Guidance Elements Barrier Orientation • Concrete barriers installed in true-vertical orientation are more prone to vehicle vaultings and rollovers. • Barrier vertical orientation had less effect on Wbeam barrier performance.
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