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Downstream Anchoring Requirements For The Midwest Guardrail System
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Book Synopsis Downstream Anchoring Requirements for the Midwest Guardrail System by : Mario Mongiardini
Download or read book Downstream Anchoring Requirements for the Midwest Guardrail System written by Mario Mongiardini and published by . This book was released on 2013 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Extending TL-2 Short Radius Guardrail to Larger Radii by : Cody S. Stolle
Download or read book Extending TL-2 Short Radius Guardrail to Larger Radii written by Cody S. Stolle and published by . This book was released on 2014 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Minimum Effective Guardrail Length for the MGS by : Nicholas A. Weiland
Download or read book Minimum Effective Guardrail Length for the MGS written by Nicholas A. Weiland and published by . This book was released on 2013 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed analysis of the minimum effective guardrail length for the MGS (Midwest Guardrail System).
Book Synopsis Phase I Assessment of Guardrail Length-of-need by : Francisco Daniel B. Albuquerque
Download or read book Phase I Assessment of Guardrail Length-of-need written by Francisco Daniel B. Albuquerque and published by . This book was released on 2014 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Critical Flare Rates for the Midwest Guardrail System (MGS) by :
Download or read book Evaluation of Critical Flare Rates for the Midwest Guardrail System (MGS) written by and published by . This book was released on 2008 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of the Midwest Guardrail System (MGS) for Standard and Reduced Post Spacing and in Combination with Curbs by :
Download or read book Development of the Midwest Guardrail System (MGS) for Standard and Reduced Post Spacing and in Combination with Curbs written by and published by . This book was released on 2004 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Steel-post Version of Trailing-end Anchorage System, Phase I by : Tewodros Y. Yosef
Download or read book Steel-post Version of Trailing-end Anchorage System, Phase I written by Tewodros Y. Yosef and published by . This book was released on 2020 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2013, a non-proprietary, trailing-end anchorage system with a modified Breakaway Cable Terminal (BCT) was developed by the Midwest Roadside Safety Facility (MwRSF) for the Midwest Guardrail System (MGS). Although this trailing-end, guardrail anchorage system adequately met the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH) TL-3 safety requirements, the use of two breakaway wood posts was deemed to have several drawbacks. For state DOTs that primarily utilize steel posts, it was desired to develop a steel-post alternative for the BCT posts utilized in the trailing-end anchorage system. Thus, a critical need existed to develop a non-wood option to anchor the downstream end of the MGS. The objective of this research project was to develop a non-proprietary, steel-post version of the trailing-end anchorage system. The Universal Breakaway Steel Post (UBSP), utilized within the thrie-beam bullnose system, was found to be a viable option to replicate the breakaway performance of the BCT wood posts. Design concepts were developed from modification to the UBSP while utilizing the same basic cable anchor and ground line strut as used in the wood-post, trailing-end anchorage system to provide similar breakaway performance and anchorage capacity. Dynamic jerk tests were conducted to evaluate the breakaway performance of the end anchor posts and the capacity of the design concepts. Based on the dynamic jerk test results and input from Midwest Pooled Fund Program member states, a preferred steel-post, downstream anchorage design was selected and further developed. Final anchorage design included: (1) two breakaway steel posts; (2) a steel compression ground line strut between the two steel breakaway steel posts; (3) one steel anchor cable connecting the W-beam rail to the base of the end anchor post; and (4) a T-shaped, breaker bar attached to the end anchor post to facilitate the release and rotation of the end post. Recommendations for full-scale crash testing were provided for the preferred steel-post, trailing-end anchorage system.
Book Synopsis Recommended Guidelines for Curb and Curb-barrier Installations by : Chuck A. Plaxico
Download or read book Recommended Guidelines for Curb and Curb-barrier Installations written by Chuck A. Plaxico and published by Transportation Research Board. This book was released on 2005 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.
Book Synopsis MASH Evaluation of the Steel-post, Trailing-end Anchorage System by : Karla A. Lechtenberg
Download or read book MASH Evaluation of the Steel-post, Trailing-end Anchorage System written by Karla A. Lechtenberg and published by . This book was released on 2020 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a TL-3 F-shape Temporary Concrete Median Barrier by : Ronald K. Faller
Download or read book Development of a TL-3 F-shape Temporary Concrete Median Barrier written by Ronald K. Faller and published by . This book was released on 1996 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Author :American Association of State Highway and Transportation Officials. Task Force for Roadside Safety Publisher : ISBN 13 : Total Pages :560 pages Book Rating :4.0/5 ( download)
Book Synopsis Roadside Design Guide by : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Download or read book Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and published by . This book was released on 1989 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 1999 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Highway Facility Design 2004 by : National Research Council (U.S.). Transportation Research Board
Download or read book Highway Facility Design 2004 written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 2004 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concept Development of a Bullnose Guardrail System for Median Applications by :
Download or read book Concept Development of a Bullnose Guardrail System for Median Applications written by and published by . This book was released on 1998 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Alternate Cable Anchor Designs and Three-cable Guardrail Adjacent to Steep Slope by :
Download or read book Evaluation of Alternate Cable Anchor Designs and Three-cable Guardrail Adjacent to Steep Slope written by and published by . This book was released on 2005 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase II Development of a Bullnose Guardrail System for Median Applications by : Bob W. Bielenberg
Download or read book Phase II Development of a Bullnose Guardrail System for Median Applications written by Bob W. Bielenberg and published by . This book was released on 1998 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research study consisted of Phase II of the development and full-scale vehicle crash testing of a bullnose barrier concept for the treatment of median hazards. The bullnose guardrail consisted of a 12-gauge thrie beam rail supported by twenty-two wood posts, eleven posts on each side of the system. Horizontal slots were cut in the valleys of selected thrie beam sections to aid in vehicle capture as well as to reduce the buckling and bending capacities of the rail. Two full-scale crash tests were performed, both using a 2000-kg pickup truck. The first crash test, impacting at a speed of 100.2 km/h and an angle of 0 degrees, was unsuccessful following the rupture of the thrie beam and subsequent uncontrolled penetration of the vehicle behind the barrier. Computer simulation of the failed test was performed using LS-DYNA. Analysis of the simulation and full-scale test results led to the addition of two steel cables placed behind the top and middle humps of the thrie beam nose section to aid in truck containment without stiffening the barrier. Computer simulation of the modified design demonstrated successful containment of the pickup truck. The second test, impacting at a speed of 103.5 km/h and an angle of 0 degrees was determined to be successful according to the safety standards set forth by the Test Level 3 (TL-3) evaluation criteria described in the NCHRP Report No. 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features" (1993). The next phase of the bullnose barrier system design will be to complete the remaining crash tests needed for compliance with the NCHRP Report No. 350 safety standards for median barriers.
Download or read book NCHRP Report 537 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: