Tl 4 Crash Testing Of The F411 Bridge Rail
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| Author | : Dean C. Alberson |
| Publisher | : |
| Total Pages | : 54 |
| Release | : 2004 |
| Genre | : Bridge railings |
| ISBN | : |
Texas Department of Transportation (TXDOT) and Florida Department of Transportation (FDOT) frequently receive requests to provide aesthetically pleasing traffic rails for use on select bridges and roadways. TxDOT, in response to providing context sensitive design alternatives, initiated a project to develop additional aesthetically pleasing rail alternatives. Under a previous TxDOT project, the F411 bridge rail was constructed and crash tested to Test Level 3 (TL-3). The TL-3 test is a 4405-lb (2000 kg) pickup impacting the railing at 25 degrees and 62.2 mi/h (100 krn/h). This test requires both containment and stability, and non-overturning. Since some breakage of the parapet is possible, potential for vehicle snagging is likely. Vehicle snagging can contribute to vehicle instabilities in the redirection sequence and potential rollover. The TxDOT F411 bridge rail contained and redirected the vehicle, which remained upright during and after the collision period. The bridge rail met the required specifications for NCHRP Report 350 test 3-11. The objective of this research is the full-scale crash test and evaluation of the F411 to Test Level 4 (TL-4). The most direct approach for accomplishing the objectives of this task is to perform a full-scale TL-4 crash test of this railing design. The TL-4 vehicle is a single-unit box-van truck impacting the railing at 15 degrees and 49.7 mi/h (80 krn/h). While containment is required, overturning of the vehicle 90 degrees is an acceptable test outcome. The TxDOT F411 bridge rail performed acceptably for NCHRP Report 350 test 4-12. Based on the performance of the F411 bridge rail in the full-scale crash test to TL-4 test conditions, the F411 may be used where containment of 18,000 lb single-unit trucks is desired.
| Author | : William F. Williams (Transportation engineer) |
| Publisher | : |
| Total Pages | : 153 |
| Release | : 2016 |
| Genre | : Automobiles |
| ISBN | : |
The Texas Type T631 bridge rail was developed as a low-cost, flexible bridge rail system for TL-2 applications. Many of the features used for the system tested at MxRSF for TL-3 were incorporated into the design developed for this project for MASH TL-2 application. The TxDOT Type T631 bridge rail was designed, developed, and evaluated under MASH TL-2. The objective of this research was to evaluate the impact performance of the new TxDOT Type T631 bridge rail to MASH TL-3. The TxDOT Type T631 bridge rail was intended to serve as a low-cost replacement for the TxDOT Type T6 bridge rail for MASH TL-2 applications. The crash testing was performed in accordance with the requirements of MASH TL-3. The TxDOT T631 Bridge Rail performed acceptably for MASH TL-3.
| Author | : |
| Publisher | : |
| Total Pages | : 76 |
| Release | : 2003 |
| Genre | : Bridge railings |
| ISBN | : |
Under a previous study, Texas Transportation Institute (TTI) and the Texas Department of Transportation (TxDOT) worked cooperatively to conceptualize and develop two aesthetically pleasing and crashworthy rail designs. The rails were designated the T77 and F411. Researchers performed and evaluated full-scale crash tests on the new rails in accordance with National Cooperative Highway Research Program (NCHRP) Report 350 test 3-11. The TxDOT F411 bridge rail performed acceptably according to the evaluation criteria of NCHRP Report 350. However, the T77 design failed to perform acceptably with the pickup truck. The objective of this project was to modify the TxDOT T77 bridge rail to perform as an aesthetically pleasing and crashworthy bridge rail. TTI and TxDOT worked cooperatively to modify the design to make the rail perform satisfactorily. Researchers performed full-scale crash tests in accordance with NCHRP Report 350. The T77 bridge rail was modified so it would perform in accordance with the evaluation criteria for NCHRP Report 350 test 3-11.
| Author | : John Russell Jewell |
| Publisher | : |
| Total Pages | : 64 |
| Release | : 2004 |
| Genre | : Bridge railings |
| ISBN | : |
Over the course of this project a see-through steel bridge rail (Type California ST-20) was developed and tested. The ST-20, as tested, is at the limits of meeting the NCHRP Report 3501 TL-4 test matrix. The bridge rail also met the requirements established in the AASHTO Bridge Design Specifications for use as a bicycle rail and is considered an aesthetically pleasing see-through bridge rail. The barrier, as tested, uses steel posts at 3-m spacing to support four boxbeam rails and one additional handrail to meet the height requirements for bicycles. Because the ST-20 is based on a TL-4 bridge rail from Wyoming DOT3,4, only Test 4-11 (NCHRP Report 350) was considered necessary.
| Author | : C. Eugene Buth |
| Publisher | : |
| Total Pages | : 227 |
| Release | : 1999 |
| Genre | : Automobiles |
| ISBN | : |
The objective of this study was to crash test and evaluate the New York Two-Rail Curbless and FourRail Curbless Bridge Railings, and the box beam transition. Under the first part of the study, the Two-Rail and Four-Rail bridge railings were evaluated to National Cooperative Highway Research Program (NCHRP) Report 350 test level 4 (TL-4). To evaluate to TL-4, three full-scale crash tests on the length of need (LON) of the longitudinal barrier, or bridge railing, are required. These include an 820-kg passenger car impacting the critical impact point (CIP) at a nominal impact speed and angle of 100 km/h and 20 degrees, a 2000-kg pickup truck impacting the CIP at a nominal impact speed and angle of 100 km/h and 25 degrees, and an 8000-kg single-unit truck impacting the CIP at a nominal impact speed and angle of 80 km/h and 15 degrees. After evaluation of the two bridge railings, New York DOT and Federal Highway Administration (FHWA) decided to evaluate a box-beam transition attached to the New York Four-Rail Curbless Bridge Railing. NCHRP Report 350 test designation 3-21, which is the 2000-kg pickup truck impacting the CIP of the transition at 100 km/h and 25 degrees, was performed on the transition. This report presents the details and results of all six crash tests performed under this contract.
| Author | : |
| Publisher | : |
| Total Pages | : 102 |
| Release | : 2018 |
| Genre | : Automobiles |
| ISBN | : |
The objective of thei research was to evaluate the impact performance of the TxDOT T224 Bridge Rail according to the safety performance evaluation guidelines included in AASHTO MASH for test level five (TL 5). This report describes the TxDOT T224 Bridge Rail, documents the impact performance of the rail system according to MASH TL-5 evaluation criteria, and presents recommendations regarding implementation.
| Author | : Oscar Pena |
| Publisher | : |
| Total Pages | : 257 |
| Release | : 2020 |
| Genre | : Roads |
| ISBN | : |
A new steel, side-mounted, beam-and-post, bridge rail was designed, crash-tested, and evaluated according to safety performance guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware, Second Edition (MASH 2016) for Test Level 4 (TL-4). The new bridge rail system was designed to be compatible with multiple concrete bridge decks utilized by the States of Illinois and Ohio. Bridge rail configurations were designed and optimized based on weight per foot, constructability, and safety. Post-to-rail and rail-to-rail connections were designed for the new bridge rail. Several concepts for these connections were configured, and after discussion with representatives from Illinois and Ohio Departments of Transportation, a preferred concept was selected for full-scale crash testing with a single-unit truck (SUT), a pickup truck, and a small car. The new bridge rail consisted of three tubular steel rail elements supported by W6x15 (W150x22.5) steel posts mounted to the exterior, vertical edge of the concrete deck and spaced at 8 ft (2.4 m) on centers. The top rail element was an HSS 12-in. x 4-in. x 1⁄4-in. (HSS 304.8-mm x 101.6-mm x 6.4-mm) and the lower two rail elements were HSS 8-in. x 6-in. x 1⁄4-in. (HSS 203.2-mm x 152.4-mm x 6.4-mm). The centerline heights of the rail elements were 37 in. (940 mm), 28 in. (711 mm), and 16 in. (406 mm) above the surface of the deck for the top, middle, and bottom rails, respectively. Four MASH 2016 TL-4 crash tests were performed on the new bridge rail, which successfully contained and redirected each of the MASH 2016 TL-4 vehicles. All occupant risk measures and evaluation criteria were within MASH 2016 limits. In the initial run of test designation no. 4-12, test no. STBR-1 with the SUT, the impact severity did not meet the minimum limit of 142.0 kip-ft (180.6 kJ). Thus, test designation no. 4-12 was re-run in test no. STBR-4, and the results met all MASH 2016 impact safety criteria, ensuring that the new bridge rail meets MASH 2016 TL-4 standards.
| Author | : |
| Publisher | : |
| Total Pages | : 52 |
| Release | : 1992 |
| Genre | : Bridge railings |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 62 |
| Release | : 1989 |
| Genre | : Bridge railings |
| ISBN | : |
| Author | : Ensco, inc. Applied Technology and Engineering Division |
| Publisher | : |
| Total Pages | : 104 |
| Release | : 1992 |
| Genre | : Bridge railings |
| ISBN | : |
