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Design Guidelines for Test Level 3 Through Test Level 5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth Retaining Walls

2022 Retaining walls
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Release : 2022
Genre : Retaining walls
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Book Synopsis Design Guidelines for Test Level 3 Through Test Level 5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth Retaining Walls by :

Download or read book Design Guidelines for Test Level 3 Through Test Level 5 Roadside Barrier Systems Placed on Mechanically Stabilized Earth Retaining Walls written by . This book was released on 2022. Available in PDF, EPUB and Kindle. Book excerpt: 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

2013
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Release : 2013
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Book Synopsis 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 by : Deeyvid Oscar Saez Barrios

Download or read book 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. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: 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

Design of Roadside Barrier Systems Placed on MSE Retaining Walls

2010 Technology & Engineering
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Release : 2010
Genre : Technology & Engineering
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Book Rating : 995/5 ( reviews)

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Book Synopsis Design of Roadside Barrier Systems Placed on MSE Retaining Walls by : Roger P. Bligh

Download or read book Design of Roadside Barrier Systems Placed on MSE Retaining Walls written by Roger P. Bligh. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt: 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

2010
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Release : 2010
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Book Synopsis Design of Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls by : Kang Mi Kim

Download or read book Design of Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Walls written by Kang Mi Kim. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements - EBGEO

2012-01-09 Technology & Engineering
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Release : 2012-01-09
Genre : Technology & Engineering
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Book Rating : 461/5 ( reviews)

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Book Synopsis Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements - EBGEO by : Deutsche Gesellschaft für Geotechnik

Download or read book Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements - EBGEO written by Deutsche Gesellschaft für Geotechnik. This book was released on 2012-01-09. Available in PDF, EPUB and Kindle. Book excerpt: The completely revised and extended Recommendations deal with all questions relevant to the planning and dimensioning of geosynthetics-reinforced earth structures. In addition to the demands on materials and analysis principles, the applications of geosynthetics in a range of foundation systems, ground improvement measures, highways engineering projects, in slopes and retaining structures, and in landfill engineering are discussed. The Recommendations have been supplemented by the following sections: - reinforced earth structures over point or linear bearing elements, - foundation systems using geotextile-encased columns, - bridging subsidence, - dynamic actions of geosynthetic-reinforced systems. The remaining sections have been fundamentally revised and updated in line with current standards and codes of practice.

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