Design manual mechanically stabilized earth mse chapter 200. The original bridge and structures design manual was created through the publicprivate partnership of the georgia department of transportation and the consulting engineering companies of georgia. Guidance on the seismic design of retaining structures for building. The most widely used seismic design methodology is based on the pseudostatic mononobeokabe method which has gone through many modifications leading to that incorporated in the 2004 aashto lrfd bridge design specifications. Little formal guidance on the seismic design of retaining walls for residential properties is available at. Limit equilibrium design framework for mse structures with extensible reinforcement 2016. Gabion walls design guide gravity wall design gabion walls are generally analyzed as gravity retaining walls, that is, walls which use their own weight to resist the lateral earth pressures. Our dedicated mse division specializes in the delivery of mse systems of all types in all market segments.
The mse wall design spreadsheet will be based on the following. Request documents that are not currently available by emailing. Code application examples, provides stepbystep examples for using individual code provisions, such as computing base shear or building period. Mse wall engienering a new look at contracting, design, and. The stability of the wall system is derived from the interaction between the. Plans preparation manual ppm 2020 fdot design manual. This document was modified from the original design manual for inclusion of lrfd material and general content by georgia. The design procedures presented in design manual for segmental retaining walls, 3rd ed. Have the wall subcontractor provide a field representative who, in the past three years. This appendix governs the design of permanent and temporary mse wall structures.
The report details the development of the design procedures. The design of mse walls follows the design steps provided in chapter 18. Use of a slope stability approach to compute seismic earth pressure. Geometric design of intersections 6a1horizontal intersection design. Mse wall engineering a new look at contracting, design, and construction presented by. The objective of this guideline is to provide information on retaining wall design in accordance with the city of nanaimo the city and the british columbia building code bcbc requirements.
Wisdot bridge manual chapter 14 retaining walls january 2019 146 14. These walls typically have a footprint base width from 0. Chapter 14 retaining walls wisconsin department of transportation. Engineering and design retaining and flood walls 1. Provide the wall designer with a complete set of project plans and specifications and ensure that the wall design is compatible with all other project features that can impact the design and construction of the wall.
Mse wall structures are internally stabilized fill walls constructed of alternating layers of compacted soil and reinforcement. Mse wall engienering a new look at contracting, design. It provides guidance for understanding and applying policies, standards and criteria in recognition of the need to. A mechanically stabilized earth mse retaining wall is a composite structure consisting of alternating layers of compacted backfill and soil reinforcement elements, fixed to a wall facing. Have the wall subcontractor provide a field representative who, in. Distribution statement design, load and resistance factor design lrfd. Discussion of the current state of design practices 4. Static and seismic pressures for design of retaining walls by guoxi wu, ph. Geotechnical technical guidance manual may 2007 introduction 11 section 1 introduction this geotechnical technical guidance manual tgm provides technical guidance for geotechnical work performed by the federal lands highway flh. Chapter 6 seismic design page 62 geotechnical design manual m 4603. Common examples of this are the addition of a new or modified wearing surface or the attachment of new utilities to a. Mechanically stabilized earth mse walls in accordance with this sts and the wall. To view the implementation bulletin for the current fdm, please see rdb1907. Spreadsheet design of mechanically stabilized earth walls.
Keystone mse wall design and seismic applications productspec. Mse wall is an intuitive program for mse wall design mechanically stabilized earth wall. Back to back walls for ramps landslide repair phased construction. For each of the mse wall alignments, the site and subsurface conditions should be analyzed to identify areas of geotechnical concern, risk, or potential variability in subsurface conditions which may influence the technical feasibility, design, andor construction or economic viability of the mse wall system. The stability of the wall system is derived from the interaction between the backfill and soil reinforcements, involving friction and tension. Nilex mse systems can be designed to address technical challenges such as potential for differential settlement and seismic activity, heavy loading and nonstandard backfill materials. Walls, abutments, and piers california amendments to aashto lrfd bridge design specifications 8th edition 11i a april 2019. Construction guidelines manual which is a current update of fhwa sa96071, has evolved from.
Over the last decade, there have been significant changes in the stateofknowledge regarding mechanically stabilized earth mse and srws. Chapter 17 abutments, retaining walls, and reinforced slopes nysdot geotechnical draft page 177 of 176 draft october 1, 2012 design manual 17. Design manual mechanically stabilized earth mse chapter. This document outlines scdots design methodology for mechanically stabilized earth mse walls. The mse wall design within this manual is based upon load and. Vespa mse retaining wall design software cti software. The 3rd edition seismic design manual includes sections on general seismic design considerations, analysis considerations, and systems not specifically detailed for seismic resistance. The design life of both permanent and temporary mse walls is provided in chapter 18. Therefore, any retaining wall design requiring a building permit shall be performed by a. Gravity walls gravity walls resist loads primarily by the dead weight of the wall. This mechanically stabilized earth walls mse and reinforced soil slopes rss, design and.
Aashto lrfd bridge design specifications, section 11. Vespa mse design software is built around the understanding that the goal of the design engineer is to produce a set of clear, comprehensive construction drawings. Building design examples, furnish examples of seismic design ofcommontypes of buildings. This is the equation shown in the ncma design manual ref. Gec 11 design and construction of mechanically stabilized. The nzta bridge manual 20 provides guidance on the. The advantages of the coulomb equation for srw design is that the equation accounts for wall bat ter. Mechanically stabilized earth walls and reinforced soil slopes design and construction guidelines 2000. Mechanically stabilized earth mse walls in accordance with this sts and the wall manufacturers recommendations, and in conformance with the lines, grades, designs, and dimensions shown in the plans or established by the resident construction engineer rce. For highstrength steel apply the resistance factor to guaranteed ultimate tensile strength. Reinforced walls rely heavily on soil strength for the structure. Mechanical properties and engineering significance of these components are discussed below.
This report provides analytical and design methods for the seismic design of retaining walls, buried structures, slopes, and embankments. We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the goal of more useable flat land. The mse wall design within this manual is based upon load and resistance factor design lrfd procedures. Mse walls are commonly used on indot projects to retain insitu soils, back to back mse walls for ramps, wing walls, and as mi\.
Mse wall design criteria for each limit state are presented below in tables 11, ex tr emv n i l i s a ex tr mvn il i s a service i limit state strength i limit state 1. Wisdot bridge manual chapter 14 retaining walls january 2019 143 14. The geotechnical manual documents the departments standards of practice for geotechnical investigations, design, and reporting. As a wall designer, this document should be used to determine required design methodologies, submittals, and other project specific requirements. This manual provides guidance for the safe design and economical construction of retaining and flood walls.
A presentation to bc hydro generation engineering on september 27, 2017. Seismic design methods for mse walls were initially adapted from that for. This manual is a revision to lrfd and an update to the fhwa nhi00043 manual which was based upon allowable stress design asd procedures. Engineering design manual stoneterratm mse wall system 1st edition december 2010 2 stoneterratm mse wall components a stoneterratm mse wall consists of many components. Miscellaneous structural elements 214 alaska bridges and structures manual september 2017 in particularly, soft soils or when settlement may be a problem, walls can be pile supported. Rockery design and construction guidelines publication no. Lrfd design manual georgia department of transportation.
The design manual for segmental retaining walls srw is a publication of the national concrete masonry association. The first edition of the design manual was published in 1993 and a second one in 1997. Nchrp report 611 seismic analysis and design of retaining. Retaining wall design for the railroad infrastructure.
Different seismic force resisting systems are covered in the balance of the sections, along with diaphragms, chord and collectors as well as an introduction to engineered damping systems. The ab stones provide a nominal setback of twelve degrees from vertical. This manual is intended primarily for retaining walls which will be subjected to hydraulic loadings such as flowing water, submergence, wave action, and spray, exposure to. Limited service bridge is open for emergency vehicle traffic. Added load rating is required when a new feature is added to a bridge that increases or redistributes the existing permanent loads on a bridge.
We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the. Typical gravity wall systems used in railroad applications include castinplace concrete and cantilever walls, modular block walls, twalls r, soil nail walls, and mechanically stabilized earth. These wall types may be used in both cut and fill applications. The vespa calculation engine can simultaneously run static, seismic, and ics analysis in accordance to ncma or aashto lrfd design methodologies. Common examples of this are the addition of a new or modified wearing surface or the attachment of new utilities to a bridge. Trbs national cooperative highway research program nchrp report 611. For wall specifiers, an example of a project specification for reon is located at the end of this manual and is available for use. Mechanically stabilized earth mse wall evaluations 200f4driven pile design. Piles add to the cost, especially relative to a mse wall.
Retaining wall shall be designed to withstand lateral earth and water pressures, including any live and dead load surcharge, the self weight of the wall. The use of horizontal layers of welded wire mesh anchor mesh as horizontal tiebacks for soil reinforcement mse walls is discussed separately. Bridge approach embankments and fills through which cutandcover tunnels are constructed should be designed to remain stable during the design seismic event because. Chapter 7 retaining walls seismic analysis and design of. Rural twolane 6a2intersection design vehicle 6a3modern roundaboutsgeneral guidance 6a3aroundabout feasibility initial screening tool. A reduced number of lanes for normal traffic is available within three months of the earthquake. Design guidance specific to each type of retaining wall.
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