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Evaluation Of Guardrail To Concrete Bridge Rail Transitions
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Book Synopsis Evaluation of Guardrail to Concrete Bridge Rail Transitions by : Roger P. Bligh
Download or read book Evaluation of Guardrail to Concrete Bridge Rail Transitions written by Roger P. Bligh and published by . This book was released on 2003 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 2001, the Design Division and Bridge Division of Texas Department of Transportation released a new standard for an approach guardfence to concrete bridge rail transition that complies with the testing requirements of National Cooperative Highway Research Program (NCHRP) Report 350 for use on high-speed roadways. The purpose of this research was to develop a transition that is suitable for use on lower speed roadways and that is less expensive and complex than the current high-speed design. A low-cost transition was successfully evaluated at 45 mph impact speeds under NCHRP Report 350 Test Level 2 conditions. A second objective of the project was to evaluate the need for the curb detail that is one of the design elements of the newly adopted thrie beam transition design. Elimination of the curb would greatly enhance installation flexibility and reduce installation cost. The assessment of the curb was accomplished through full-scale crash testing.
Book Synopsis Crash Testing and Evaluation of the HDOT's Thrie-beam Approach Guardrail Transition Attached to 42-in. Tall, Solid Concrete Bridge Rail with Aesthetic Recessed, Rounded Panels and 6-ft. Wide Sidewalk by : Tewodros Y. Yosef
Download or read book Crash Testing and Evaluation of the HDOT's Thrie-beam Approach Guardrail Transition Attached to 42-in. Tall, Solid Concrete Bridge Rail with Aesthetic Recessed, Rounded Panels and 6-ft. Wide Sidewalk written by Tewodros Y. Yosef and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Bridge Approach Rails by : Roger P. Bligh
Download or read book Evaluation of Bridge Approach Rails written by Roger P. Bligh and published by . This book was released on 1992 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recent study on the performance of guardrail-to-bridge rail transitions revealed that many widely used designs do not meet current safety standards. As a result, the Federal Highway Administration (FHWA) requested that the Arizona Department of Transportation verify the safety performance of its standard transition designs. Three transition designs currently being used by ADOT were evaluated through a combined program of computer simulation and full-scale crash testing. The standard ADOT wood post transition, incorporating a channel rubrail and two different sizes of timber posts at a reduced post spacing near the bridge rail end, was found to be in compliance with National Cooperative Highway Research Program (NCHRP) Report 230 performance criteria. The standard ADOT steel post transition with channel rubrail was also found to be in compliance with NCHRP Report 230 requirements when impacted near the end of the bridge rail. However, the upstream end of the steel post transition required modification to eliminate deficiencies identified during testing. The modified design, which terminated the channel rubrail behind a W6x9 guardrail post, was successfully crash tested. A recent study on the performance of guardrail-to-bridge rail transitions revealed that many widely used designs do not meet current safety standards. As a result, the Federal Highway Administration (FHWA) requested that the Arizona Department of Transportation verify the safety performance of its standard transition designs. Three transition designs currently being used by ADOT were evaluated through a combined program of computer simulation and full-scale crash testing. The standard ADOT wood post transition, incorporating a channel rubrail and two different sizes of timber posts at a reduced post spacing near the bridge rail end, was found to be in compliance with National Cooperative Highway Research Program (NCHRP) Report 230 performance criteria. The standard ADOT steel post transition with channel rubrail was also found to be in compliance with NCHRP Report 230 requirements when impacted near the end of the bridge rail. However, the upstream end of the steel post transition required modification to eliminate deficiencies identified during testing. The modified design, which terminated the channel rubrail behind a W6x9 guardrail post, was successfully crash tested.
Book Synopsis MASH TL-3 Evaluation of Guardrail to Rigid Barrier Transition Attached to Bridge Or Culvert Structure by : William F. Williams (Transportation engineer)
Download or read book MASH TL-3 Evaluation of Guardrail to Rigid Barrier Transition Attached to Bridge Or Culvert Structure written by William F. Williams (Transportation engineer) and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Texas Transportation Institute (TTI) researchers performed an extensive literature review of bridge railing transitions crash tested to Manual for Assessing Safety Hardware (MASH) TL-3, and incorporated the information obtained from this review into the design and details for the new transition testing developed for this project. TTI researchers developed concepts for the new transition anchored to a concrete wing wall. TTI researchers developed a full-scale, three-dimensional finite element model of the guardrail transition. The modeling effort included developing and validating a subcomponent level model of the post installed on concrete. Upon completion of the simulations, TTI researchers processed the results and assessed the likelihood of the transition system passing the required MASH crash tests. TTI researchers noted the design deficiencies and recommended design modifications to the system to mitigate those deficiencies. TTI researchers developed full-scale test installation drawings of the design after the finite element model simulations were completed and all the results were reviewed with favorable results. After approval of the test installation drawings by Texas Department of Transportation (TxDOT), construction of a full-scale test installation for crash testing commenced, and crash tests were performed on the full-scale test installation. The Guardrail to Rigid Barrier Transition Attached to Bridge or Culvert Structure, used on the upstream and downstream ends, performed acceptably for MASH TL-3 transitions.
Book Synopsis Development of Guardrail to Bridge Rail Transition by : Roger P. Bligh
Download or read book Development of Guardrail to Bridge Rail Transition written by Roger P. Bligh and published by . This book was released on 1988 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the development and testing of a guardfence-to-rigid bridge rail transition. The transition consists of a tubular W-beam supported on 7 inch diameter round wood posts. It is designed to transition to a vertical wall or to the concrete safety shaped barrier. It can be used on new construction or as a retrofit for existing installations. Based on a full-scale vehicular crash test program, the design was judged to be in compliance with recommended impact performance criteria as presented in NCHRP Report 230. Also described is a tentative design for approach guardfence at bridge ends near an abutting roadway. The design consists of short radius, curved guardrail supported on weakened round wood posts.
Book Synopsis Performance Evaluation of the Guardrail to Concrete Barrier Transition - Update to NCHRP 350 Test No. 3-21 with 28" C.G. Height (2214T-1) by : Karla A. Polivka
Download or read book Performance Evaluation of the Guardrail to Concrete Barrier Transition - Update to NCHRP 350 Test No. 3-21 with 28" C.G. Height (2214T-1) written by Karla A. Polivka and published by . This book was released on 2006 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crash Testing and Evaluation of Retrofit Bridge Railings and Transition by : Eugene Buth
Download or read book Crash Testing and Evaluation of Retrofit Bridge Railings and Transition written by Eugene Buth and published by . This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: An assortment of retrofit bridge railings and a retrofit transition were evaluated through full-scale crash testing. The assortment included: (1) a W-beam retrofit railing for a concrete baluster bridge railing (AASHTO performance level one); (2) a W-beam transition for the bridge railing above (NCHRP Report 350 test level two); (3) a double-tube pedestrian/bicycle railing mounted on the Illinois 2399-1 traffic railing (AASHTO performance level one); (4) a vandal protection fence on the New Jersey concrete safety shape bridge railing (AASHTO performance level two); and (5) a thrie beam retrofit railing, a Delaware design, mounted on a 203-mm-high safety curb (AASHTO performance level two and NCHRP Report 350 test level four). All of the designs demonstrated acceptable performance.
Book Synopsis Two Approach Guardrail Transitions for Concrete Safety Shape Barriers by :
Download or read book Two Approach Guardrail Transitions for Concrete Safety Shape Barriers written by and published by . This book was released on 1998 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two approach guardrail transitions for use with concrete safety shape barriers were developed and crash tested. For this study, the transition systems were attached to the New Jersey safety shape concrete barrier; however, it is believed that these transition systems could be easily adapted to the F-shape barrier with no need for further crash testing. Both transition designs were constructed with two nested thrie beam rails measuring 2.66-mm thick. The first transition design was supported by nine W150x13.5 steel posts measuring, 1,981-mm long, while the second transition design was supported by nine 152-mm x 203-mm wood posts measuring 2,134-mm long. For both systems, post spacings consisted on one at 292 mm, five at 476 mm, and three at 952 mm. A triangular-shape concrete curb was constructed below the thrie beam rail on each approach guardrail transition system. The two transition systems successfully met the Test Level 3 requirements specified in NCHRP Report 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features."
Book Synopsis Guardrail and Median Barrier Crashworthiness by : Malcolm H. Ray
Download or read book Guardrail and Median Barrier Crashworthiness written by Malcolm H. Ray and published by . This book was released on 1997 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to state department of transportation (DOT) roadway design, traffic, structural, maintenance, and research engineers and others concerned with highway safety issues. This synthesis describes the current state of the practice for the use of guardrails and median barriers and their crashworthiness. It includes information about the crashworthiness and typical applications of the most common, permanently installed, nonproprietary guardrail and median barrier systems used in the United States today. A significant amount of detail is included in the text to aid the design, selection, and locating processes for safe and effective guardrails and median barriers. The report presents data obtained from a review of the literature and a survey of state DOTs. The synthesis presents a description of the typical longitudinal barriers in use today, including drawings, the extent of their use, and the most recent testing on each guardrail and barrier system, with particular emphasis on NCHRP Report 230 and 350 requirements. In addition, it discusses the maintenance issues, cost constraints, and common problems with each type of barrier. The synthesis only discusses the crashworthiness of guardrails and median barriers; their transitions and terminals are not discussed.
Book Synopsis NCHRP Report 350 Evaluation of the Nebraska Thrie-beam Transition by : Brian G. Pfeifer
Download or read book NCHRP Report 350 Evaluation of the Nebraska Thrie-beam Transition written by Brian G. Pfeifer and published by . This book was released on 1998 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Guardfence to Bridge Rail Transitions by : Roger P. Bligh
Download or read book Performance Evaluation of Guardfence to Bridge Rail Transitions written by Roger P. Bligh and published by . This book was released on 2004 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Testing and Evaluation of the W-beam Transition (on Steel Posts with Timber Blockouts) to the Vertical Flared Back Concrete Bridge Parapet by : K. K. Mak
Download or read book Testing and Evaluation of the W-beam Transition (on Steel Posts with Timber Blockouts) to the Vertical Flared Back Concrete Bridge Parapet written by K. K. Mak and published by . This book was released on 1996 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation and Design of ODOT's Type 5 Guardrail with Tubular Backup by : Chuck A. Plaxico
Download or read book Evaluation and Design of ODOT's Type 5 Guardrail with Tubular Backup written by Chuck A. Plaxico and published by . This book was released on 2006 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this project was to assess the performance of both the ODOT GR-2.2 guardrail and the ODOT GR-3.4 transition system under NCHRP Report 350 test level 3 (TL-3) conditions, propose any modifications that would improve their crashworthiness and, ultimately ensure that the final designs qualify for use on the National Highway System (NHS) as TL-3 systems. Finite element analyses of the guardrail and transition system were performed using the LS-DYNA finite element software to simulate NCHRP Report 350 Test 3-10 and Test 3-11 impact scenarios. The analysis results indicated that the original ODOT GR-2.2 guardrail would successfully meet all NCHRP Report 350 test level 3 safety criteria. The analyses also indicated that the performance of the system could be significantly improved with simple modifications to the guardrail. The integrated system of the Nested Type 5 Guardrail with Tubular Backup and the ODOT GR-3.4 transition was considered the most practical and feasible design improvement and was therefore recommended as a final design.
Book Synopsis Testing and Evaluation of the W-beam Transition (on Steel Posts with Timber Blockouts) to the Vertical Flared Back Concrete Bridge Parapet by : King K. Mak
Download or read book Testing and Evaluation of the W-beam Transition (on Steel Posts with Timber Blockouts) to the Vertical Flared Back Concrete Bridge Parapet written by King K. Mak and published by . This book was released on 1997 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The crash test reported herein was performed in an effort to evaluate a modified W-beam transition design (on steel posts with timber blockouts) to the vertical flared back concrete bridge parapet according to NCHRP Report 350 guidelines. The crash test performed corresponded to NCHRP Report 350 test designation 3-11 involving a 2000P test vehicle impacting the transition at a nominal speed and angle of 100 km/h and 25 degrees.
Book Synopsis Test and Evaluation of Traffic Barriers. Final Technical Report by : Dale Stout
Download or read book Test and Evaluation of Traffic Barriers. Final Technical Report written by Dale Stout and published by . This book was released on 1989 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of crash tests were conducted to evaluate several types of guardrails and bridge rails. Two bridge rail designs were tested and showed acceptable performance when evaluated in accordance with NCHRP 230. A three-cable guardrail was modified, and an end terminal was redesigned to obtain-good performance. The guardrail safely redirected a large and small vehicle traveling at 60 mi/h and impacting at 25 and 20 degrees, respectively. The terminal design was tested for snagging by directly impacting the downstream end. Although the device released, the vehicle rolled over. A new PL3 median barrier was designed and tested in accordance with the new AASHTO bridge rail test criteria. A 50,000-1b tractor-trailer impacted the median barrier at 50 mi/h and 15 degrees. The truck was redirected and contained, but rolled over producing undesirable occupant compartment intrusion. An 18,000-1b truck test was conducted on the modified thrie beam median barrier. The results indicated good performance.
Book Synopsis Testing and Evaluation of MASH TL-3 Transition Between Guardrail and Portable Concrete Barriers by : Robert W. Bielenberg
Download or read book Testing and Evaluation of MASH TL-3 Transition Between Guardrail and Portable Concrete Barriers written by Robert W. Bielenberg and published by . This book was released on 2017 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guardrail-bridge Rail Transition Designs by : Maurice E. Bronstad
Download or read book Guardrail-bridge Rail Transition Designs written by Maurice E. Bronstad and published by . This book was released on 1986 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This project was concerned with the transition designs used between W-beam and thrie guardrail, and rigid bridge rail parapets or wingwalls. State designs submitted to the Federal Highway Administration (FHWA) were rated and designs selected for crash test evaluation. New designs were also formulated and subjected to crash test evaluation. Most of the crash tests were conducted with 4500-lb (2000-kg) cars at 60 mph (95 km/hr) and a 25-degree angle. Design drawings are presented along with recommendations for use of these transition designs. Guidelines for transition features are given and design procedures for independent end blocks are given. This volume, which is third in a series, contains appendix C, Ratings of State Transition Designs, and appendix D, Barrier VII Plots for Selected Transitions."--Technical report documentation p.
