United States Department of Transportation
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CRASH TEST AND EVALUATION OF RESTRAINED SAFETY-SHAPE CONCRETE BARRIERS ON CONCRETE BRIDGE DECK
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2018-01-01
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[PDF-8.12 MB]
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Abstract:This research designed and tested a new portable concrete barrier that meets the performance of MASH TL-4 and can be used in temporary and permanent applications on bridge decks. Additionally, this new barrier system will minimize deflection, allowing placement of the barrier system as close to the edge of the deck system without compromising barrier performance for MASH TL-4. Additional, using the barrier system on a minimum deck thickness of 7.0 inches was also preferred. This report presents the design and testing results of the new successful barrier system developed for this project. The purpose of the testing reported herein was to assess the performance of the restrained safety-shape concrete barrier on concrete bridge deck according to the safety-performance evaluation guidelines included in AASHTO MASH for Test Level 4 (TL-4). The crash test performed was in accordance with MASH test 3-11, which involves a 10000S vehicle impacting the restrained safety-shape concrete barrier at a target impact speed and impact angle of 56 mi/h and 15 degrees, respectively. The safety-shape concrete barrier restrained on concrete deck contained and redirected the 10000S vehicle. The vehicle did not penetrate, underride, or override the installation. Maximum dynamic deflection during the test was 7.1 inches. No detached elements, fragments, or other debris were present to penetrate or show potential for penetrating the occupant compartment or show undue hazard to others in the area. Maximum occupant compartment deformation was 6.0 inches in the left side floor pan adjacent to the left front door. The 10000S vehicle remained upright during and after the collision period. The restrained safety-shape concrete barrier on concrete deck performed acceptably for MASH Test 4-12. The new restrained barrier section with the cross-bolt connection as described and tested herein using 1-inch diameter dowels anchored to a 7.0-inch thick deck is recommended for implementation on new or existing retrofit projects. This barrier system successfully met all the requirements of MASH TL-4. This barrier system as designed and tested herein is recommended for use on the National Highway System with deck thicknesses of 7.0 inches or greater.
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