Mash 2016 Test Level 3 And Test Level 4 Evaluation Of Roadside Safety Barrier With Pedestrian Features
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MASH 2016 Test Level 3 Evaluation of MNDOT Bicycle and Pedestrian Rail
| Author | : Miguel A. Hinojosa |
| Publisher | : |
| Total Pages | : 150 |
| Release | : 2020 |
| Genre | : Roads |
| ISBN | : |
The objective of this research study was to evaluate the thrie-beam bullnose system using Universal Breakaway Steel Posts (UBSPs) to Manual for Assessing Safety Hardware (MASH 2016) criteria. In Phase I, three full-scale crash tests were conducted to evaluate the bullnose design. The crash tests were conducted according to the TL-3 criteria outlined in MASH 2016. The first test, test no. MSPBN-1, was conducted according to MASH 2016 test designation no. 3-35 with a 2270P vehicle at a speed of 62.9 mph (101.3 km/h) and an angle of 25.1 degrees. Test no. MSPBN-1 was conducted to examine the non-gating, thrie-beam bullnose crash cushion at critical impact point on the system where the behavior transitioned from capture to redirection. The second test, test no. MSPBN-2, was conducted according to MASH 2016 test designation no. 3-34 with an 1100C vehicle at a speed of 62.1 mph (100.0 km/h) and an angle of 14.7 degrees. Test no. MSPBN-2 was conducted to evaluate the impact performance of the bullnose as the device behavior changed from capture to redirection. The third test, test no. MSPBN-3, was conducted according to MASH 2016 test designation no. 3-32 with an 1100C vehicle at a speed of 62.7 mph (101.0 km/h) and an angle of 15.1 degrees. Test no. MPSNB-3 was conducted to evaluate the bullnose behavior during oblique impacts on the end or nose of the system. The tests were successful and met the MASH 2016 TL-3 safety requirements. Based on the successful completion of the first three critical tests in the MASH 2016 evaluation of the thrie-beam bullnose, it is believed that the remaining MASH 2016 TL-3 test matrix should be completed to certify the MASH 2016 compliance of the thrie beam bullnose system.
MASH TL-3 Evaluation of the Unreinforced, Single-slope Concrete Median Barrier
| Author | : Robert W. Bielenberg |
| Publisher | : |
| Total Pages | : 102 |
| Release | : 2018 |
| Genre | : Roads |
| ISBN | : |
The Ohio Department of Transportation (ODOT) requested an evaluation of an unreinforced, single-slope concrete median barrier capable of satisfying Test Level 3 (TL-3) safety requirements found in the Manual for Assessing Safety Hardware, Second Edition (MASH 2016). The barrier was designed with a height of 42 in. (1,067 mm), a base width of 28 in. (711 mm), and top width of 12 in. (305 mm). The tarmac surface was milled down 1 in. (25 mm) to accommodate the barrier and asphalt pad. The barrier was cast in place using concrete with a minimum compressive strength of 4,000 psi (27.6 MPa). Expansion joints were installed in 20-ft (6.1-m) intervals to simulate cracking and potential barrier discontinuities. An asphalt pad, installed on the milled surface using a tack coat, functioned as the barrier keyway and extended 96 in. (2,438 mm) from the traffic and back sides of the barrier. Previous testing of similar single-slope concrete barriers indicated that only one full-scale crash test (MASH test designation no. 3-11) was needed to satisfy TL-3 criteria. During the test, the 5,001-lb (2,268-kg) pickup impacted the installation at a speed of 62.8 mph (101.0 km/h) and at an angle of 24.9 degrees for an impact severity of 116.3 kip-ft (157.7 kJ). The vehicle was safely contained and redirected, and the test satisfied safety performance evaluation criteria of test designation no. 3-11 found in MASH 2016.
MASH TL-4 Crash Testing and Evaluation of the RESTORE Barrier
| Author | : Jennifer D. Schmidt |
| Publisher | : |
| Total Pages | : 295 |
| Release | : 2015 |
| Genre | : Median strips |
| ISBN | : |
"Three full-scale vehicle crash tests were conducted according to the MASH Test Level 4 (TL-4) safety performance criteria on a restorable and reusable energy-absorbing roadside/median barrier, designated the RESTORE barrier. The system utilized for test nos. SFH-1 through SFH-3 was 240 ft (73.2 m) long with a nominal height of 38 5/8 in. (981 mm). The barrier consisted of an upper steel tube rail attached to top of the 20-ft (6.1-m) long x 22 1/4-in. (565-mm) wide precast concrete beams connected with wedge-shaped joints and supported by 11 5/8-in. (295-mm) tall rubber posts and steel skids" (page i).
MASH TL-3 Evaluation of the TxDOT TL-3 Low-profile Barrier for High Speed Applications
| Author | : Chiara Silvestri Dobrovolny |
| Publisher | : |
| Total Pages | : 96 |
| Release | : 2018 |
| Genre | : Automobiles |
| ISBN | : |
In response to the implementation requirements set forth by the Federal Highway Administration, the Texas Department of Transportation Bridge, Design, Maintenance, and Traffic Operations Divisions reviewed their standards for roadside safety devices and identified those devices that require testing and evaluation to assess MASH compliance. Under this phase of the project, the Low-Profile MASH Concrete Barrier (LPCB-13) was evaluated. The objective of this project was to design a TL-3 low-profile barrier for high speed applications and assess its performance according to the safety-performance evaluation guidelines included in MASH for Test Level 3 (TL-3) longitudinal barriers. Based on the detailed computer model simulations results, researchers performed MASH full-scale crash tests on a low-profile portable concrete barrier system comprised of 26-inch tall, 30-ft long barrier segments with a T-shape profile. Based on constructbility feedback, researchers modified the straight side of the barrier to a 1:18 slope, to allow for easiness of construction forming tje TL-3 Low -Profile Barrier performed acceptably as a MASH TL-3 longitudinal barrier.
MASH 2016 Test Level 4 Evaluation of MNDOT Concrete Parapet with Brush Curb and Upper Beam and Post Rail with New Tapered End Section
| Author | : Miguel A. Hinojosa |
| Publisher | : |
| Total Pages | : 313 |
| Release | : 2021 |
| Genre | : Roads |
| ISBN | : |
The Minnesota Department of Transportation (MnDOT) desires to use a concrete parapet with a brush curb, upper beam and post rail, and a new tapered end section along high-speed highways and roadways when bridge structures are encountered. The MnDOT combination bridge railing system was full-scale crash tested according to the Test Level 4 (TL-4) procedures described in the Manual for Assessing Safety Hardware (MASH 2016). The combination bridge railing system consisted of a 21-in. tall concrete parapet with a 6-in. tall and 2-in. wide brush curb at the lower front face and eight rail and post assemblies, which consisted of one steel rail welded onto two or three steel posts with their own welded base plates. The steel assemblies were anchored to the top face of the concrete parapet. In full-scale crash test nos. MNCBR-1, MNCBR-2, and MNCBR-3, the bridge railing system was evaluated according to MASH 2016 test designation nos. 4-12, 4-11, and 4-10, respectively. The 2013 International Durastar 4300 SBA single-unit truck impacted the system 60 1/8 in. upstream from the centerline of the splice between post nos. 6 and 7 with a speed of 57.4 mph at an angle of 15.4 degrees. The 2014 Dodge Ram 1500 crew cab pickup truck impacted the system 69.9 in. upstream from the centerline of post no. 23 with a speed of 63.9 mph at an angle of 25.1 degrees. The 2009 Kia Rio small car impacted the system 70 7/16 in. upstream from the centerline of post no. 23 with a speed of 62.5 mph at an angle of 25.5 degrees. The vehicles were successfully contained and redirected, resulting in minimal plastic deformation to the upper steel railing and moderate to minimal scraping and gouging of the concrete parapet. The combination bridge railing system was found to meet the AASHTO MASH 2016 TL-4 impact safety criteria.
Roadside Design Guide
| Author | : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety |
| Publisher | : |
| Total Pages | : 560 |
| Release | : 1989 |
| Genre | : Roads |
| ISBN | : |
MASH TL-3 Evaluation of Concrete and Asphalt Tied-down Anchorage for Portable Concrete Barrier
| Author | : Robert W. Bielenberg |
| Publisher | : |
| Total Pages | : 181 |
| Release | : 2019 |
| Genre | : Roads |
| ISBN | : |
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 1 1/8-in. (29-mm) diameter A307 Grade A threaded rods per barrier epoxied into the concrete with an embedment depth of 51⁄4 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 11⁄2-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 131⁄2 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.
Development and Evaluation of MASH TL-4 Guardrail System
| Author | : Nauman Mansoor Sheikh |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2021 |
| Genre | : Automobiles |
| ISBN | : |
Researchers at the Texas A&M Transportation Institute (TTI) designed and tested a Manual for Assessing Safety Hardware (MASH) Test Level 4 (TL-4) compliant metal guardrail system. The researchers first developed several preliminary design concepts of the guardrail system, one of which was selected by the Texas Department of Transportation (TxDOT) for further development through simulation and crash testing. The researchers then developed a full-scale finite element model of the selected system and performed impact simulations under MASH TL-4 impact conditions. Using the results of these impact simulations, the researchers made further improvements to the guardrail design and developed the final system design details for crash testing. TTI then constructed the guardrail installation and performed MASH Test 4-12 with a single unit truck, MASH Test 4-11 with a pickup truck, and MASH Test 4-10 with a small car to meet MASH TL-4 compliance criteria for longitudinal barriers. This report provides details of the guardrail design development, the crash tests and results, and the performance assessment of the guardrail system for MASH TL-4 longitudinal barrier evaluation criteria. The design developed under this research project provides a MASH TL-4 compliant guardrail system that allows TxDOT to provide enhanced roadside safety in corridors that experience above-average heavy vehicle traffic.
