Development Of A Retrofit Low Deflection Temporary Concrete Barrier System
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Development Of A Retrofit Low Deflection Temporary Concrete Barrier System
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Author : Robert W. Bielenberg
language : en
Publisher:
Release Date : 2014
Development Of A Retrofit Low Deflection Temporary Concrete Barrier System written by Robert W. Bielenberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Roads categories.
Portable Concrete Traffic Barrier For Maintenance Operations
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Author :
language : en
Publisher:
Release Date : 2005
Portable Concrete Traffic Barrier For Maintenance Operations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Roads categories.
The objective of this project is to develop and test a portable barrier system for high-speed applications that can be easily transported and erected by Texas Department of Transportation (TxDOT) maintenance forces using readily available equipment such as a front-end loader. Consideration was given to factors such as segment length, segment weight, connection method, barrier constructability, and dynamic barrier deflection.
California State Publications
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Author :
language : en
Publisher:
Release Date : 1997
California State Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with State government publications categories.
Development Of Low Deflection Precast Concrete Barrier
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Author :
language : en
Publisher:
Release Date : 2004
Development Of Low Deflection Precast Concrete Barrier written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Concrete construction 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 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.
Development Of A Non Pinned Low Profile End Treatment
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Author : Felicia Jean Desorcie
language : en
Publisher:
Release Date : 2014
Development Of A Non Pinned Low Profile End Treatment written by Felicia Jean Desorcie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
In the early 1990s, the Low-Profile Portable Concrete Barrier (PCB) system, including both the sloped Low-Profile PCB segment and Low-Profile PCB end treatment, were developed. The original Low-Profile PCB end treatment was designed with steel pins inserted along the barrier centerline, through precast holes, and anchored to the pavement or subgrade. The purpose of these pins was to reduce lateral deflection of the end treatment during an impact. For various reasons, users of the Low-Profile PCB system have stated that the system would be more easily deployed if the vertical pins were not used in situations where lateral deflections can be permitted. The primary objective of the research presented herein was to determine the feasibility of removing the vertical, steel pins from the Low-Profile PCB end treatment in certain applications and if necessary make modifications. The secondary objective of the research presented herein was to demonstrate the applicability of the finite element analysis (FEA) to unpinned barrier systems. The research objectives were achieved through the use of sound engineering judgment, FEA, and a full-scale crash test. Based on sound engineering judgment and approximate strength analyses of the original Low-Profile PCB design, the author determined the system would most likely function acceptably but would have large lateral deflections. In order to increase connection rigidity and thus control lateral displacement, a plate washer was added to the barrier connection. The modified non-pinned Low-Profile PCB system was tested for strength in a full-scale crash test under Manual for Assessing Safety Hardware (MASH) test 2-35. Additionally, the recommended system was analyzed under similar test conditions with LS-DYNA, a finite element code. The recommended system passed the MASH test 2-35, in both a full-scale crash test and FEA. While this does not replace the original barrier, it does provide another option for use of the Low-Profile PCB in situations where sufficient room for deflection outside of the length of need exists. If this room does not exist, the barrier must remain pinned. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151825
Development Of A Transition Between Free Standing And Reduced Deflection Portable Concrete Barriers Phase I
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Author : Mojdeh Asadollahi Pajouh
language : en
Publisher:
Release Date : 2017
Development Of A Transition Between Free Standing And Reduced Deflection Portable Concrete Barriers Phase I written by Mojdeh Asadollahi Pajouh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Roads categories.
Development Of A Steel H Section Temporary Barrier For Use In Limited Deflection Applications
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Author : Karla A. Polivka
language : en
Publisher:
Release Date : 2003
Development Of A Steel H Section Temporary Barrier For Use In Limited Deflection Applications written by Karla A. Polivka 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.
A tie-down system was developed for use with Iowa's steel H-section temporary barrier. For this system, the original barrier connection detail was modified in order to simplify barrier attachment to one another as well as to more easily accommodate deviations in horizontal and vertical alignment. At each barrier joint, two steel shear plates were positioned within an opening on the adjacent barrier section and held in place with two steel drop pins. Four steel angle brackets were welded to the barrier's base at every joint in order to allow for the barriers to be rigidly attached to the concrete bridge deck using drop-in anchors. Two full-scale vehicle crash tests, using 3/4-ton pickup trucks, were performed on the steel H-section barrier system.
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.