Development Of A Plan For Compliance With Nchrp 350 For Temporary Concrete Barriers
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Development Of A Plan For Compliance With Nchrp 350 For Temporary Concrete Barriers
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Author : Muhannad Zubi
language : en
Publisher:
Release Date : 2002
Development Of A Plan For Compliance With Nchrp 350 For Temporary Concrete Barriers written by Muhannad Zubi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Report (National Cooperative Highway Research Program). categories.
The Federal Highway Administration has mandated that temporary concrete barriers (TCBs) used on federally funded projects on the National Highway System advertised after October 1, 2002 shall meet the requirements of National Cooperative Highway Research Program (NCHRP) Report 350. The State's present TCB system design is not approved as meeting the NCHRP 350 requirements, and even with modifications it is not likely to meet those standards. The Arizona Department of Transportation (ADOT) and Arizona industry partners are to evaluate many key factors in the ADOT's effort to develop an NCHRP 350 compliance plan for TCBs. Arizona intends to adopt the most valid non-proprietary TCB design, out of already approved designs, for future use in Arizona.
Development Of A Plan For Compliance With Nchrp 350 For Temporary Concrete Barriers
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Author : Arizona Transportation Research Center
language : en
Publisher:
Release Date : 2002
Development Of A Plan For Compliance With Nchrp 350 For Temporary Concrete Barriers written by Arizona Transportation Research Center and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Report (National Cooperative Highway Research Program). categories.
Development Of An Nchrp Report 350 Tl 3 New Jersey Shape 50 Inch Portable Concrete Barrier
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Author : Chuck A. Plaxico
language : en
Publisher:
Release Date : 2006
Development Of An Nchrp Report 350 Tl 3 New Jersey Shape 50 Inch Portable Concrete Barrier written by Chuck A. Plaxico and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Concrete categories.
For roadside work-zones in areas that have opposing traffic flow, safety is enhanced if the temporary barriers incorporate a "glare-shield" that blocks headlight glare from opposing traffic. Currently-available 32-inch portable concrete barriers require the use of an add-on glare shield attached to the top of the barrier. The add-on glare shields are an extra expense and complicate barrier set-up and handling. An alternative solution was to develop a 50-inch high portable concrete barrier which is tall enough to serve as its own glare-shield. Finite element analysis was used to investigate various barrier shapes and connection schemes to identify a successful crashworthy design that would meet requirments of NCHRP Report 350 Test level 3. A 50-inch portable concrete barrier design was developed based on the results of the finite element analyses and was crash tested at the Transportation Research Center in East Liberty, Ohio. The system successfully met all safety criteria of NCHRP Report 350 and has been approved by the Federal Highway Administration for use on the National Highway System as a test level 3 device.
Development Of A Tie Down System For Temporary Concrete Barriers
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Author :
language : en
Publisher:
Release Date : 2002
Development Of A Tie Down System For Temporary Concrete 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 2002 with Roads categories.
This report details the development and testing of an NCHRP Report 350 compliant tie-down system for use with F-shape temporary concrete barriers. Development of the tie-down system began with the creation and evaluation of several design concepts. Following the researchers' evaluation of the design prototypes, the steel strap tie-down concept was selected for further study.
Nchrp Report 350 Test 3 11 Of The Washington Type 2 Concrete Barrier
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Author : Delbert Lance Bullard
language : en
Publisher:
Release Date : 2001
Nchrp Report 350 Test 3 11 Of The Washington Type 2 Concrete Barrier written by Delbert Lance Bullard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Median strips categories.
Two crash tests are required to evaluate portable concrete barriers, such as Washington Department of transportation (WsDOT) Type 2 concrete barriers, to NCHRP Report 350 test level three (TL-3). NCHRP Report 350 test designation 3-10 involves an 820 kg passenger vehicle impacting the critical impact point (CIP) of the length of need (LON) section at a nominal speed and angle of 100 km/h and 20 degrees. NCHRP Report 350 test designation 3-11 involves a 2000 kg pickup truck impacting the CIP of the LON section at a nominal speed and angle of 100 km/h and 25 degrees. Finite element analysis using LS-DYNA was used to simulate NCHRP Report 350 test designation 3-11 with the 2000 kg pickup truck on the standard Type 2 concrete barrier with a pin and loop connection and two modified pin and loop connections. In subsequent full-scale crash tests, both the standard and a modified concrete barrier met the evaluation criteria of NCHRP Report 350 for Test 3-11. For each of the two pin and loop configurations crash tested, the Washington Type 2 concrete barrier met the evaluation criteria of NCHRP Report 350 for test 3-11.
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 Barrier System For Off Road Applications
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Author : Kenneth H. Addink
language : en
Publisher:
Release Date : 1998
Development Of A Temporary Barrier System For Off Road Applications written by Kenneth H. Addink and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Anchorage (Structural engineering) categories.
The safety shape portable concrete barrier (PCB) has been approved for use when placed on a bituminous or concrete pad. Construction personnel would like to use PCBs in temporary situations along roadways where the use of a bituminous or concrete pad is impractical and costly. However, when PCBs are placed on soil foundations with no anchorage, they tend to dig into the soil, causing the barrier sections to rotate or overturn. The objective of this research was to develop a device which will allow temporary PCBs placed on soil foundations to translate without significant rotation when impacted by errant vehicles. This device was developed and successfully tested to Test Level 3 of the National Cooperative Highway Research Program (NCHRP) Report No. 350.
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.
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.
Guidelines For Design And Operation Of Nighttime Traffic Control For Highway Maintenance And Construction
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Author : James E. Bryden
language : en
Publisher: Transportation Research Board
Release Date : 2002
Guidelines For Design And Operation Of Nighttime Traffic Control For Highway Maintenance And Construction written by James E. Bryden 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 Automobile driving at night categories.