Prioritization Of Research On Bridge Railings For Use On Timber Deck Bridges And Development Of Two Glulam Bridge Railing Systems
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Prioritization Of Research On Bridge Railings For Use On Timber Deck Bridges And Development Of Two Glulam Bridge Railing Systems
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Author : Jared T. Duren
language : en
Publisher:
Release Date : 2021
Prioritization Of Research On Bridge Railings For Use On Timber Deck Bridges And Development Of Two Glulam Bridge Railing Systems written by Jared T. Duren and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
In the past, many timber bridge railings, bridge railings for use on timber deck bridges, and approach guardrail transition systems to accompany these railings, have been developed to meet different impact safety criteria. Through an extensive literature review, the design details of these systems were identified and organized. A survey was then developed and distributed to multiple government agencies and timber industry members to identify their desire for these bridge railing and approach guardrail transition systems to be developed to meet current American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH) impact safety criteria. The data provided from the survey was analyzed, and a list of 15 bridge railing systems was created, which included accompanying approach guardrail transitions. This list prioritized the bridge railing systems based upon the number of survey respondents requesting such a bridge railing system. Cost estimates for the research and development of each bridge railing system were also provided in order to proceed into subsequent phases of this research project. The development of a MASH TL-4 glued-laminated (glulam) timber rail with curb bridge railing system was initiated in Phase II. Many similar systems have been developed in the past to meet previous impact safety criteria, but an updated design was necessary to meet current MASH impact safety criteria. Through impact simulations with the computer software program BARRIER VII, a model was created and calibrated to previous crash testing results. After a series of modifications to the bridge railing system represented in the model, including increasing the size and height of multiple components, the simulation effort demonstrated that the modified TL-4 bridge railing was acceptable under the MASH criteria. Additional research on connection details and timber deck strengths, the development of an approach guardrail transition system, and component and full-scale testing programs are yet to be performed in the completion of the Phase II project. An additional project was advanced and involved the adaptation of a previouslydeveloped, MASH TL-1 crashworthy, low-height, curb-type, glulam bridge railing system for transverse, nail-laminated decks to be capable of use on transverse, glulam timber decks, which is part of a Phase III effort. Analysis of the system components and timber deck types led to the creation of a static and dynamic component testing program utilizing two surrogate bridge decks. To date, the test plans and details have been developed, with the construction and testing programs yet to be performed. In the future, results from the component testing program will be utilized to demonstrate that the bridge railing system contains adequate height and strength when used on transverse, glulam timber decks.
Adapation Of Concrete And Timber Bridge Railings For Low Volume Traffic
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Author : Russell W. Masterson
language : en
Publisher:
Release Date : 2023
Adapation Of Concrete And Timber Bridge Railings For Low Volume Traffic written by Russell W. Masterson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Bridge railings are a safety feature to protect the traveling public by containing and redirecting errant vehicles during run-off-road (ROR) events. Most bridge railing design and evaluation efforts have focused on ROR crashes on high-volume roads. Bridge railings for low-volume roads can be designed for lower impact speeds, so railings designed for high-volume roads are unnecessarily robust for low-volume applications and can be optimized to reduce costs for bridge owners while still providing adequate safety. The aim of this research has been focused on improving the design of two low-volume bridge railing systems for use by the United States Department of Agriculture, Forest Service, Missoula Technology and Development (USDA-FS-MTDD) The first modified barrier system was originally a low-height reinforced concrete barrier designed for National Cooperative Highway Research Program Report No. 350, Test Level 2 standards (NCHRP 350 TL-2). In this research, the barrier was redesigned and optimized to meet Manual for Assessing Safety Hardware (MASH) TL-1 requirements by reducing railing dimensions and reinforcement. Additionally, construction guidance was developed for installation on concrete bridge decks of various thicknesses and overhang widths. AASHTO LRFD Bridge Design Specifications were utilized to evaluate crashworthiness and structural adequacy of the modified barrier design and the deck’s structural adequacy for lateral impact loads, vertical loads of vehicles leaning on the top of the barrier during impact events, and design traffic loads traveling adjacent to the barrier in routine service. The second bridge deck and rail system featured a transverse nail-laminated deck with a low-height timber bridge rail mounted at the edge of the deck. The original deck with railing was crashworthy, but the deck was associated with higher labor costs and more susceptible to deterioration. Further, the agency desired it be used on transverse glulam timber decks. Thus, a study was begun to adapt the railing system for use on transverse glulam decks, which would also increase the durability and likely lower the onsite construction time and labor cost of the deck system. Component tests were performed on the original and modified deck systems to confirm the acceptable performance of the modified system. From the component testing results, the glulam rail and scupper blocks installed on a transverse glulam deck resisted more lateral force, absorbed more energy, and had higher initial linear stiffness as compared to the same rail and scupper blocks installed on a transverse nail-laminated deck. Thus, the low-height, glulam timber bridge railing installed on a transverse, glulam deck will provide equal or greater safety performance as compared to the same bridge rail installed on a transverse, nail-laminated deck. As a result, the low-height, glulam timber bridge rail installed on a transverse glulam deck has also been deemed adequate for use in MASH TL-1 applications.
Fifth International Bridge Engineering Conference
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Author :
language : en
Publisher:
Release Date : 2000
Fifth International Bridge Engineering Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Bridges categories.
Papers presented at the Fifth International Bridge Engineering Conference, April 3-5, 2000, Tampa, Florida.
Transportation Research Record
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Author :
language : en
Publisher:
Release Date : 2000
Transportation Research Record written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Air travel categories.
Highway Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1993
Highway Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Highway engineering categories.
Research Accomplishments For Wood Transportation Structures Based On A National Research Needs Assessment
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Author : Michael A. Ritter
language : en
Publisher:
Release Date : 1998
Research Accomplishments For Wood Transportation Structures Based On A National Research Needs Assessment written by Michael A. Ritter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Building, Wooden categories.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1994-08
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-08 with Science categories.
Design And Testing Of A Test Level 4 Bridge Railing For Transverse Glulam Timber Deck Bridges
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Author : Michael D. Fowler
language : en
Publisher:
Release Date : 1997
Design And Testing Of A Test Level 4 Bridge Railing For Transverse Glulam Timber Deck Bridges written by Michael D. Fowler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Live Load Distribution On Longitudinal Glued Laminated Timber Deck Bridges
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Author :
language : en
Publisher:
Release Date : 2010
Live Load Distribution On Longitudinal Glued Laminated Timber Deck Bridges written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Live loads categories.
Over the past few years the United States Department of Agriculture (USDA), Forest Products Laboratory (FPL), and the Federal Highway Administration (FHWA) have supported several research programs. This paper is a result of a study sponsored by FPL, with the objective of determining how truckloads are distributed to the deck panels of a longitudinal glued-laminated timber deck bridge. Currently, the American Association of State Highway and Transportation Officials (AASHTO) LRFD (load and resistance factor design) Bridge Design Specification provides live load distribution provisions for longitudinal glued-laminated timber deck-panel bridges. The AASHTO LRFD live load distribution provisions for longitudinal glued-laminated timber deck bridges were based on the assumption that the bridge deck behaves as one slab and ignores the discontinuity of the bridge deck panels. This study investigated this assumption by using analytical models that validated field test data from several in-service bridges and data from a full-scale laboratory test bridge. The analytical models accounted for the effects of the interface between the deck panels as well as the effects of the transverse stiffener beams on the distribution of the live- load. The analytical live load distribution results above were compared with both the AASHTO LRFD and AASHTO Standard Specifications.
Testing Of New Bridge Rail And Transition Designs Appendix H Illinois Side Mount Bridge Railing
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Author : Eugene Buth
language : en
Publisher:
Release Date : 1997
Testing Of New Bridge Rail And Transition Designs Appendix H Illinois Side Mount Bridge Railing written by Eugene Buth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Bridge railings categories.
The objectives of this study were to develop safer bridge rail and transition designs and to improve design guidelines. Ten bridge railings and two transitions were designed, tested, and evaluated in accordance with American Association of State Highway and Transportation Officials (AASHTO) requirements. The railings were designed using ultimate strength procedures and collision forces from earlier research. Design procedures, railing designs, and test results are presented. All designs demonstrated acceptable collision performance.