MASH TL-3 Evaluation of Concrete and Asphalt Tied-Down Anchorage for Portable Concrete Barrier
Bob Bielenberg, Nathan Asselin, Ronald Faller
The objective of this research was to evaluate Wisconsin DOT’s F-shaped portable concrete barriers (PCBs) with a bolt-through, tie-down anchorage system for concrete road surfaces with a reduced embedment epoxy anchorage and a steel pin tie-down anchorage system for asphalt surfaces according to Manual for Assessing Safety Hardware 2016 (MASH 2016) Test Level 3 (TL-3) test designation no. 3-11 criteria. Test no. WITD-1 consisted of PCBs with a bolt-through, tie-down configuration on concrete tarmac. The system was installed with the rear toe of the PCBs placed 1 in. (25 mm) away from the edge of the simulated bridge deck. Barrier nos. 5 through 13 were attached on the traffic side with three 1⅛-in. (29-mm) diameter A307 Grade A threaded rods per barrier epoxied into the concrete with an embedment depth of 5¼ in. (133 mm). The test results for test no. WITD-1 showed that the system sufficiently contained and redirected the 2270P vehicle with controlled lateral displacements of the barrier, and the barrier system was deemed acceptable according to MASH 2016 TL-3 criteria. Test no. WITD-2 consisted of PCBs with a pinned, tie-down configuration placed on a 2-in. (51-mm) thick asphalt pad. The rear toe of the PCBs were installed 6 in. (152 mm) from the edge of a 36-in. wide x 36-in. deep (914-mm x 914-mm) trench. Barrier nos. 6 through 14 were anchored on the traffic side of the system with three 1½-in. (38-mm) diameter steel pins driven through the bolt anchor pockets on each barrier. During test no. WITD-2 the wheel well and toe pan were deformed a maximum of 13½ in. (343 mm), which surpassed the MASH 2016 deformation limits. Due to the deformation, test no. WITD-2 was deemed unacceptable under the MASH 2016 TL-3 test designation no. 3-11 safety criteria. Potential barrier modifications for improving the performance were noted for future research.
Highway Safety, Crash Test, Roadside Appurtenances, Compliance Test, MASH 2016, Test Level 3, Portable Concrete Barrier, Temporary Concrete Barrier, Pinned Barrier, Concrete Foundation, Asphalt Foundation
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