Two Approach Guardrail Transitions For Concrete Safety Shape Barriers

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Two Approach Guardrail Transitions For Concrete Safety Shape Barriers

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Author :
language : en
Publisher:
Release Date : 1998

Two Approach Guardrail Transitions For Concrete Safety Shape Barriers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Impact categories.

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."

Two Approach Guardrail Transitions For Concrete Safety Shape Barriers

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Author : Ronald K. Faller
language : en
Publisher:
Release Date : 1998

Two Approach Guardrail Transitions For Concrete Safety Shape Barriers written by Ronald K. Faller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

Development Of A Tl 3 F Shape Temporary Concrete Median Barrier

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Author : Ronald K. Faller
language : en
Publisher:
Release Date : 1996

Development Of A Tl 3 F Shape Temporary Concrete Median Barrier written by Ronald K. Faller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Median strips categories.

Work zones often require the use of temporary concrete barriers (TCBs) within a limited area to provide protection for construction workers. In situations where an existing guardrail is immediately adjacent to the construction hazards that need to be shielded, highway designers must either connect the guardrail to the temporary barrier or replace it with TCB. Although interconnecting the two barrier systems represents the more convenient option, at present no suitable solutions have been made available. A transition from guardrail to temporary barriers may not need to be nearly as stiff as a conventional approach transitions. However, it must provide sufficient stiffness and strength to prevent pocketing as well as to shield the end of the concrete barrier to prevent serious wheel snag. In addition, considerations must be made for transitioning from the TCB to the guardrail, anchoring the TCB system, and the potential use of tie-downs to limit TCB deflection. TCBs are connected and transitioned to many types of barriers. Unfortunately, little effort has been devoted to this issue. The only transitions previously developed have been between TCBs and safety shaped concrete barriers and TCBs and permanent concrete median barriers. Transitions between TCBs and other common barrier types, such as guardrail, have typically not been full-scale crash tested and may pose a serious hazard to motorists during an impact. Transitions between two barrier types generally are designed with the assumption that it is more critical to transition from a less stiff barrier to a stiffer barrier due to concerns for pocketing and snag on the stiffer barrier system. However, in the case of a TCB system, design of the transition can be more complex. Design of a transition between TCB and guardrail must consider several factors: (1) Connection of the guardrail on the upstream or downstream end of the TCB system - The location of the guardrail on either the upstream or downstream end of the transition will largely affect the transition along with other factors. For example, the attachment of the guardrail to the downstream end of an unanchored, free-standing TCB system would require a transition. This could be as simple as using tie-down anchorages on the TCB segments to increase their stiffness prior to the guardrail attachment. Conversely, attachment of the guardrail to the upstream end of a free-standing, TCB system would require a transition as well. However, this type of transition would require stiffening the guardrail as it approached the TCB. (2) Anchorage of the end of the TCB system - The location and design of the end anchorage for the TCB system will largely determine the stiffness of the TCB end as compared to the guardrail as well as the transition configuration. (3) Free-standing barrier vs. tie-down anchorage - The stiffness of the TCB section varies depending on whether the barrier segments use any form of tie-down anchorage. The design of the transition between the rail and the TCB would change depending on whether the barrier segments were free-standing or anchored. (4) Direction of traffic - The transition design may depend on the potential for two-way traffic or reverse impacts. Due to the wide range of factors affecting the design of a TCB to guardrail transition, it is necessary to develop a better understanding of the most common and most critical transition installations. Then, a transition design could be developed to meet those needs. It is anticipated that this transition design would be developed around the F-shape, TCB segment and the recently developed Midwest Guardrail System (MGS). The research study recommended herein would primarily be directed toward improving the safety and minimizing risk for the motoring public traveling within our nation's work-zones and on our highways and roadways. More specifically, this project would address the goal of the Smart Work Zone Deployment Initiative, which is "to develop improved methods and products for addressing safety and mobility in work zones by evaluating new technologies and methods, thereby enhancing safety and efficiency of traffic operations and highway workers. The project is a public/private partnership between the sponsoring public transportation agencies in several Midwestern States, the Federal Highway Administration (FHWA), private technology providers and university transportation researchers." The overall objective of this research effort is to develop a MASH TL-3 transition design between TCBs and the MGS. The design of the transition would focus on a representative selection of state departments of transportation (DOTs) highest priority configuration. Due to the large number of unknowns, this phase of the project will focus on the development of design concepts for the highest priority transition need. Full-scale crash testing of the proposed transition design is not a part of this project and may be performed in a future phase of the project. This research effort will begin with identifying and quantifying the most pressing TCB to guardrail transition needs. Although a need to develop configurations for most, if not all, of the TCB to guardrail transition needs may exist, this project will address the highest priority need. Thus, the state DOTs of the Midwest States Pooled Fund Program will be surveyed to identify the highest priority TCB to guardrail transition need. After the critical transition need is identified, potential transition concepts and prototype designs will be brainstormed. Computer simulations with LS-DYNA, a non-linear explicit finite element code, will be used to investigate and evaluate the concepts and prototype designs. CAD details for the proposed transition design will be prepared. A summary report detailing the research effort will be compiled and will include recommendations for future full-scale crash testing of the TCB to guardrail transition as well as recommendations for further development of TCB to guardrail transitions. The research study is directed toward improving the safety by minimizing the risk for the motoring public traveling within our nation's work-zones and on our highways and roadways. Since W-beam guardrail has proven to provide better safety performance than temporary concrete barriers, the development of an effective transition between the two can help preserve guardrails outside the immediate work-zone area, thus providing an overall higher level of safety for motorists. The new transition would also eliminate the use of an unproven connection between guardrail and temporary barriers. Further, limiting the use of temporary concrete barriers strictly to the work zone area will also minimize the traffic disruption that these barriers can create to motorists passing in work zones. Following the development efforts, a research report will be prepared that summarizes the results of the study. If warranted, a formal paper will be prepared and submitted for publication in a refereed journal, such as a Transportation Research Record, so that dissemination and distribution of the final research results will provide the most significant impact in terms of safety benefit for the motoring public

Development Of A Temporary Concrete Barrier To Permanent Concrete Median Barrier Approach Transition

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Author :
language : en
Publisher:
Release Date : 2010

Development Of A Temporary Concrete Barrier To Permanent Concrete Median Barrier Approach Transition 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 Roads categories.

Development Of Guardrail To Bridge Rail Transition

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Author : Roger P. Bligh
language : en
Publisher:
Release Date : 1988

Development Of Guardrail To Bridge Rail Transition written by Roger P. Bligh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Bridge railings categories.

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.

Development Of Low Profile To Safety Shape Transition Sections

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Author : W. Lynn Beason
language : en
Publisher:
Release Date : 1994

Development Of Low Profile To Safety Shape Transition Sections written by W. Lynn Beason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Roads categories.

Evaluation Of Roadside Features To Accommodate Vans Minivans Pickup Trucks And 4 Wheel Drive Vehicles

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Author : Hayes E. Ross
language : en
Publisher: Transportation Research Board
Release Date : 2002

Evaluation Of Roadside Features To Accommodate Vans Minivans Pickup Trucks And 4 Wheel Drive Vehicles written by Hayes E. Ross and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Four-wheel drive vehicles categories.

Phase Ii Development Of A Short Radius Guardrail For Intersecting Roadways

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Author :
language : en
Publisher:
Release Date : 2003

Phase Ii Development Of A Short Radius Guardrail For Intersecting Roadways written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Roads categories.

This research study consisted of the development and testing of a short-radius guardrail system for protection of hazards near intersecting roadways and capable of meeting the Test Level 3 (TL-3) impact conditions of the NCHRP Report No. 350 criteria. A short-radius system was designed and consisted of a curved and slotted thrie beam nose section with two adjacent slotted thrie beam sections supported by breakaway posts. One side of the system was attached to a TL-3 steel post transition while the other was attached to a TL-2 end terminal. A series of four full-scale crash tests were conducted on the short-radius guardrail system.

Aesthetic Concrete Barrier Design

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Author : Delbert Lance Bullard
language : en
Publisher: Transportation Research Board
Release Date : 2006

Aesthetic Concrete Barrier Design written by Delbert Lance Bullard and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Bridge railings categories.

This report contains guidelines for aesthetic treatment of concrete safety shape barriers. The report will be of particular interest to design and safety practitioners with responsibility for roadside safety improvements. The increasing application of context-sensitive design solutions for highway projects has created a national need for aesthetic improvement of typical highway features. Requests for concrete barrier treatments and bridge rails that contribute to the overall aesthetic experience are increasing. Concrete barriers (e.g., New Jersey, F-shapes, single-slope, and vertical-face designs) are often the barriers of choice in urban and suburban environments. Many transportation agencies and communities have expressed a desire for aesthetic treatments for these standard shapes. To date, there has been limited evaluation to determine which aesthetic treatments are safe and practical. Designers need guidance regarding the safety implications of aesthetic treatments for concrete barriers.

Roadside Design Guide

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Author : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
language : en
Publisher:
Release Date : 1989

Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Roads categories.