Design Guidelines For Test Level 3 Through Test Level 5 Roadside Barrier Systems Placed On Mechanically Stabilized Earth Retaining Walls
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Design Guidelines For Test Level 3 Through Test Level 5 Roadside Barrier Systems Placed On Mechanically Stabilized Earth Retaining Walls
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Author :
language : en
Publisher:
Release Date : 2022
Design Guidelines For Test Level 3 Through Test Level 5 Roadside Barrier Systems Placed On Mechanically Stabilized Earth Retaining Walls written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Retaining walls categories.
A major use of Mechanically Stabilized Earth (MSE) walls is as bridge approach embankments, where they are typically constructed with a roadside barrier system supported on the edge of the walls. The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 326: Design Guidelines for Test Level 3 through Test Level 5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth Retaining Walls is dedicated to developing guidelines for barrier-moment slab systems placed over MSE walls to resist vehicular impact loads resulting from three test levels. Supplementary to the document is a Presentation.
Design Guidelines For Test Level 3 Tl 3 Through Test Level 5 Tl 5 Roadside Barrier Systems Placed On Mechanically Stabilized Earth Mse Retaining Wall
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Author : Deeyvid Oscar Saez Barrios
language : en
Publisher:
Release Date : 2013
Design Guidelines For Test Level 3 Tl 3 Through Test Level 5 Tl 5 Roadside Barrier Systems Placed On Mechanically Stabilized Earth Mse Retaining Wall written by Deeyvid Oscar Saez Barrios and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
The use of Mechanically Stabilized Earth (MSE) wall structures has increased dramatically in recent years. Traffic barriers are frequently placed on top of the MSE wall to resist vehicular impact loads. The barrier systems are anchored to the concrete in case of rigid pavement. Nevertheless, in case of flexible pavement, the barriers are constructed in an L shape so that the impact load on the vertical part of the L can be resisted by the inertia force required to uplift the horizontal part of the L. The barrier must be designed to resist the full dynamic load but the size of the horizontal part of the L (moment slab) is determined using an equivalent static load. Current design practice of barriers mounted on top of MSE retaining wall is well defined for passenger cars and light trucks. However, the information of this impact level is extrapolated to heavy vehicle impact. Therefore, the bases of this research is to develop design procedure and to help understand the dynamic behavior of a barrier-moment slab system on top of an MSE wall when subjected to heavy vehicle impact loads. In a first part, numerical analyses were conducted to better understand the behavior of the barrier-moment slab system when subjected to heavy vehicle impact loads. The full-scale impact simulations were used to develop the recommendation for designing and sizing the barrier-moment slab system. In a second part, the barrier-moment slab systems defined to contain heavy vehicle impact loads were placed on top of an MSE wall model to study the kinematic behavior of the system. Loads in the soil reinforcing strips and displacements on the barriers and wall components are evaluated to define recommendation for design of strip reinforcements against pullout and yielding. In a third part, a full-scale crash test on a barrier-moment slab system on top of an instrumented 9.8 ft. (3 m) high MSE wall is described and analyzed. The MSE wall and barrier system were adequate to contain and redirected the vehicle and, therefore, it served as verification of the proposed recommendation. Finally, conclusions are drawn on the basis of the information presented herein. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148253
Textile Technology Digest
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Author :
language : en
Publisher:
Release Date : 2001
Textile Technology Digest written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Textile fabrics categories.
Design Of Roadside Barrier Systems Placed On Mse Retaining Walls
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Author : Roger P. Bligh
language : en
Publisher: Transportation Research Board
Release Date : 2010
Design Of Roadside Barrier Systems Placed On Mse Retaining Walls written by Roger P. Bligh 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 2010 with Technology & Engineering categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 663: Design of Roadside Barrier Systems Placed on MSE Retaining Walls explores a design procedure for roadside barrier systems mounted on the edge of a mechanically stabilized earth (MSE) wall. The procedures were developed following American Association of State Highway and Transportation Officials Load and Resistant Factor Design (LRFD) practices. Appendices A through H to NCHRP Report 663 are available online. Titles of Appendices A through H are as follows: Appendix A: Design of MSE Wall; Appendix B: State-of-Practice Survey; Appendix C: Detailed Drawing of MSE Wall for Bogie Test; Appendix D: Bogie Test MSE Wall Construction Procedure; Appendix E: Detailed Drawing of MSE Wall for TL-3 Test; Appendix F: TL-3 MSE Wall Construction Procedure; Appendix G: Crash Test Vehicle Properties and Information; Appendix H: Crash Test Sequential Photographs--
Design Of Roadside Barrier Systems Placed On Mechanically Stabilized Earth Mse Retaining Walls
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Author : Kang Mi Kim
language : en
Publisher:
Release Date : 2010
Design Of Roadside Barrier Systems Placed On Mechanically Stabilized Earth Mse Retaining Walls written by Kang Mi Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Millions of square feet of mechanically stabilized earth retaining wall are constructed annually in the United States. When used in highway fill applications in conjunction with bridges, these MSE walls are typically constructed with a roadside barrier system supported on the edge of the wall. This barrier system generally consists of a traffic barrier or bridge rail placed on a continuous footing or structural slab. The footing is intended to reduce the influence of barrier impact loads on the retaining wall system by distributing the load over a wide area and to provide stability for the barrier against sliding or overturning. The proper design of the roadside barrier, the structural slab, and the MSE wall system requires a good understanding of relevant failure modes, how barrier impact loads are transferred into the wall system, and the magnitude and distribution of these loads. In this study, a procedure is developed that provides guidance for designing: 1. the barrier-moment slab, 2. the wall reinforcement, and 3. the wall panels. These design guidelines are developed in terms of AASHTO LRFD procedures. The research approach consisted of engineering analyses, finite element analyses, static load tests, full-scale dynamic impact tests, and a full-scale vehicle crash test. It was concluded that a 44.5 kN (10 kips) equivalent static load is appropriate for the stability design of the barrier-moment slab system. This will result in much more economical design than systems developed using the 240 kN (54 kips) load that some user agencies are using. Design loads for the wall reinforcement and wall panels are also presented.
Bulletin Of The Atomic Scientists
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Author :
language : en
Publisher:
Release Date : 1970-06
Bulletin Of The Atomic Scientists written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970-06 with categories.
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
Selection And Placement Guidelines For Test Level 2 Through Test Level 5 Median Barriers
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Author : Christine E. Carrigan
language : en
Publisher:
Release Date : 2022
Selection And Placement Guidelines For Test Level 2 Through Test Level 5 Median Barriers written by Christine E. Carrigan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Roads categories.
The variety of median widths and terrains combined with evolving testing specifications and lack of conclusive data on median crossover crashes have been obstacles to developing median barrier guidance. The TRB National Cooperative Highway Research Program's NCHRP Research Report 996: Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers develops, in a format suitable for consideration and possible adoption by AASHTO, proposed guidelines for the selection and placement of Manual for Assessing Safety Hardware (MASH) Test Levels 2 through 5 (TL2-TL5) median barriers.
Development Of A Mash Tl 3 Transition Between Guardrail And Portable Concrete Barriers
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Author : David A. Gutierrez
language : en
Publisher:
Release Date : 2014
Development Of A Mash Tl 3 Transition Between Guardrail And Portable Concrete Barriers written by David A. Gutierrez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Road work zones categories.
Often, road construction causes the need to create a work zone. In these scenarios, portable concrete barriers (PCBs) are typically installed to shield workers and equipment from errant vehicles as well as prevent motorists from striking other roadside hazards. For an existing W-beam guardrail system installed adjacent to the roadway and near the work zone, guardrail sections are removed in order to place the portable concrete barrier system. The focus of this research study was to develop a proper stiffness transition between W-beam guardrail and portable concrete barrier systems. This research effort was accomplished through development and refinement of design concepts using computer simulation with LS-DYNA. Several design concepts were simulated, and design metrics were used to evaluate and refine each concept. These concepts were then analyzed and ranked based on feasibility, likelihood of success, and ease of installation. The rankings were presented to the Technical Advisory Committee (TAC) for selection of a preferred design alternative. Next, a Critical Impact Point (CIP) study was conducted, while additional analyses were performed to determine the critical attachment location and a reduced installation length for the portable concrete barriers. Finally, an additional simulation effort was conducted in order to evaluate the safety performance of the transition system under reverse-direction impact scenarios as well as to select the CIP. Recommendations were also provided for conducting a Phase II study and evaluating the nested Midwest Guardrail System (MGS) configuration using three Test Level 3 (TL-3) full-scale crash tests according to the criteria provided in the Manual for Assessing Safety Hardware, as published by the American Association of Safety Highway and Transportation Officials (AASHTO).
Development Of Mash Tl 3 Transitions For Cast In Place Concrete Barriers
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Author : Nauman Mansoor Sheikh
language : en
Publisher:
Release Date : 2020
Development Of Mash Tl 3 Transitions For Cast In Place Concrete Barriers written by Nauman Mansoor Sheikh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Automobiles categories.
The objective of this project was to develop transition designs for three cast in place concrete barrier combinations. These included transitions for connecting (a) TxDOT's 36-inch tall Single Slope Traffic Rail (SSTR) to 42-inch tall Single Slope Concrete Barrier (SSCB), (b) 32-inch tall F-shape concrete barrier to SSCB, and (c)TxDOT's 32-inch tall T221 vertical concrete wall to SSCB. The designs were required to meet AASHTO [Manual for Assessing Safety Hardware] MASH Test Level 3 (TL-3) criteria, and their compliance was to be evaluated using a combination of past testing results, impact simulation analyses, and limited full scale testing. Researchers developed designs and reinforcement details for all three transitions. The transition from SSTR to SSCB was comprised of a single slope barrier profile on the traffic side. This design did not require simulation or testing due to the known MASH compliance of the single slope barrier profile. Researchers developed designs of the other two transitions by performing dynamic vehicular impact simulations using MASH TL-3 impact conditions. Using results of these simulations, researchers selected the most critical cases for performance of full scale crash tests. The design selected for full scale testing was the transition between T221 and SSCB. MASH requires performing Test 3-20 (small car) and Test 3-21 (pickup) to evaluate transition designs. Both tests were performed on the transition between T221 and SSCB. The direction of vehicle impact in both tests was from the side of the SSCB to T221, which was selected based on simulation results. The transition performed acceptably in both tests for MASH TL-3 criteria. Based on the results of the simulations for F-shape to SSCB transition, and the fact that the more critical design of T221 to SSCB transition passed MASH testing, the F-shape to SSCB transition was also considered a MASH compliant design. This report provides details of the transition designs, simulation analyses,
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.