If you continue browsing the site, you agree to the use of cookies on this website. The basic design precepts employed in cantilever walls include considerations of dead man tiebacks, taking active pressures to the bottom of the wall and considering any reductions in passive resistance for inclined slopes. Determine the resultant vertical force, w total intersects the bottom of the footing. Ab engineering manual retaining walls allan block wall. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a range of possible finishes. Design of sheet pile walls using truline composite wall sections design methods and examples introduction this report presents the recommended structural capacities for truline composite wall sections and a summary of design methods commonly used to design cantilevered and anchored sheet pile structures. Cantilever retaining wall functions and design considerations. In this post, we are going to show how cantilever retaining walls can be analysed and designed on staad pro software, and also compare the answer obtained with classical solutions. Wisdot regional staff determines the need for permanent retaining walls on highway projects. The details of calculations mr are tabulated below. Under static conditions, retaining walls are acted upon by body forces related to the mass of the wall, by soil pressures, and by external forces such as those transmitted by braces. Nov 19, 2016 retaining wall slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Calculate the factors of sa fety with respect to overturning, sliding, and bearing capacity. Calculations had been submitted in advance for these designs by 15 contributors and an initial comparison was presented at the workshop. Cantilever and restrained retaining wall design software. Downloads retaining wall design software cti software. Retaining wall design in staad pro software youtube.
Reinforced concrete cantilever retaining wall analysis and. Final duevel arema retaining wall design for the railroad. Stepbystep design of a cantilevered retaining wall. Surcharge large surcharge loads are induced on retaining walls in close proximity to track.
Cantilever timber pole walls are probably the most commonly used form of. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. Full details of masonry wall construction are provided in reinforced concrete masonry cantilever retaining walls design and. Developed by the makers of geo5, the easytouse free software ensures all the details of your project are accounted for while the robust input options allow for extremely precise geotechnical modeling. Design of cantilever pole retaining walls to resist earthquake loading for residential sites. It is time consuming to do all the stability and reinforcement design. For retaining wall design, the applicable train liveload surcharge is the cooper e80, which can be approximated as 1,880 pounds per square foot per foot psfft of rail. Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. Common design issues are described in the following sections. Active earth pressure tends to variation of earth pressure deflect the wall away from the 5. The purpose of this article is for the reader to fully understand the principle behind it. How to choose the right retaining wall for your project. A secant pile wall example will be analyzed with deepex.
This procedure is intended to be readily calculated by hand, although use of calculation software. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. The details of a cantilever retaining wall are shown below, is the design of the wall satisfactory. A total of ten designs were considered, of which three were retaining walls. Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation.
Example 11 castinplace concrete cantilever retaining wall 4 2020 summary of unfactored loads and moments resolve moments about point a see figure 1 typical section load combinations ev 1 ev 2 dc 2 dc 3 vehicular collision load 18. Design example the following design example briefly illustrates some of the basic steps used in the allowable stress design of a reinforced concrete masonry cantilever retaining wall. The objective of this research was to conduct a field performance study on a full scale cantilever retaining wall in order to verify or modifyu current design procedures. The wall is assumed to be located in the christchurch port hills. Abstract three examples of retaining walls were prepared for comparison of designs. Design and detailing of retaining walls learning outcomes. Norfolk and tasman retaining walls au keystone retaining wall systems. P a active earth pressure or earth pressure pa and passive earth pressure pp. Cantilever retaining wall sheet excel civil engineering program. The following figure shows theses different types of.
Deepex can design retaining walls with many different wall and support types. 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. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. Section 9 of en 19971 applies to retaining structures supporting ground i. Wsdot standard plan reinforced concrete retaining wall. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. Cantilever retaining wall analysis, design, drawing and quantity software. The load calculation forms the base for entire design of the retaining wall. This type of wall uses much less material than a traditional gravity wall. Possible modes of failure for freestanding concrete cantilever retaining walls. The stem is a vertical cantilever beam, acted on by the horizontal earth pressure.
Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. A summary of the design calculations is presented in. Oct 16, 2017 all elements of behave like cantilever beam of slab. The following worked example uses a simplified lrfd design procedure with load and resistance factors taken from b1vm4. The base is divided into two parts, the heel and toe. It is considered suitable for common residential situations with competent soils.
Worked example 1 design of cantilever pol retaining. For engineering background, see the blog post cantilever retaining walls. The safety factor against sliding minimum required f. Foundation design 18 example 1 design the cantilever sheet pile wall that satisfy the requirements for stability of the wall. Concrete masonry reinforced cantilever retaining walls. Preface standards australia has published as 46782002 for the design of earth retaining structures, which include segmental concrete gravity retaining walls. To further understand the designed approach, here is a worked example of the design of the retaining wall. Cantilever retaining wall design example linkedin slideshare. Supports and external loads can be added on the model graphically or using the userfriendly model wizard.
Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. In general, they are used to hold back or support soil banks and water or to maintain difference in the elevation of the ground surface on each of wall sides. This gl pressure tends to deflect the wall outward. Design of slopped gravity retaining wall in excel design of vertical gravity retaining wall sloped type. Check against a worked example in the reference above. Cantilever walls the cantilever wall figure 1b and figure 2 is the most common type of retaining structure and generally is used for walls in the range from 10 to 25 ft in height. We should know that retaining walls must satisfy geotechnical, equilibrium, structural, upheaval, seismic considerations, etc. National choice of design approach for retaining walls 17. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. Retaining walls slope stability slope stabilization slope stability analysis. Ground water behind a retaining wall, whether static or percolating through a subsoil, can have adverse effects upon the design and stability. Footing design of shear wall per aci 31814 excel spreadsheet calculator of anchored sheetpile wall penetrating sandy soils excel spreadsheet, xls, xlsx, anchored sheet pile wall.
Reinforced concrete cantilever retaining wall analysis and design aci 318m14 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. This is a simple web app that is able provide a basic design of a cantilever retaining wall based on user inputs. Deflection generally governs design for cantilever walls more than 18 feet high. Cantilever or restrained retaining wall design calculations o r g a n iz a io n f. As a result, the designer must ensure that by appropriate. Retaining wall design of reinforced concrete structure. In the design of civil engineering structures, retaining walls are normally used to retain soil earth materials, and they are usually found on embankments, highways, basement of buildings, etc. The example calculations are made here using mathcad. The cantilever retaining wall design involves two major steps. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation. Design of retaining wall with counterfort engineering. The ab stones provide a nominal setback of twelve degrees from vertical.
Cantilever retaining wall sheet excel civil engineering. Counterfort retaining wall design example using asdip retain. The procedure is more of a general summary and an appreciation of the role of subsurface exploration in geotechnical design. An analysis of the designs submitted is presented here. This example is intended to be readily calculated by hand although a lot of structural spreadsheets and software such as prokon are available. The program is used to verify the cantilever wall design. Cantilever rc retaining wall 10 knm2 m 500 mm h 400 0.
It is time consuming to do all the stability and reinforcement design using in house tools. Retaining wall development is described in section 11555 of the. Worked example 2 design of concrete cantilever retaining walls to. Design of concrete cantilever retaining wall civil. To design retaining walls, it is necessary to define failure and to know how walls can fail. Cantilevered walls are made from a relatively thin stem of steelreinforced, castinplace concrete or mortared masonry, fixed at one end, usually by way of a simple, embedment or cantilever foundation often in the shape of an inverted t.
Types of retaining wall cantilever retaining wall 9. Design the reinforced concrete masonry cantilever retaining wall shown in figure 2. Assuming that the allowable bearing pressure of the soil is 120 knm. This publication presents an example on the design of retaining structures. The paper covers a theoretical approach in data acquisition needed for design of a retaining wall. Bartoskewitz engineering research associate research report no. The coefficient of friction between the footing and foundation soil, k 1, is 0. Design steps and procedure of counterfort retaining wall is explained in this video. Soilstructure software increases the engineers bottom line by eliminating hours of tedious calculations.
Appendix a examples colorado department of transportation. Geotechnical design dublin, 14 june, 20 support to the implementation, harmonization and. Worked examples presented at the workshop eurocode 7. This course will take approximately 3 hours to finish at the end of taking this course you will have a better understanding of design of cantilever retaining walls based on latest codes, how to look for practical concerns before actual design, drawing and drainage details, and how to write csi specifications. Cantilever walls cantilever wall design deep excavation. It is so named because its individual parts toe, heel, and stem behave as, and design as, cantilever beams. Design of gravity retaining walls in excel sloped and stepped.
The cantilever retaining wall shown below is backfilled with granular material having a unit weight. Design of cantilever sheet pile walls january 2015. Analysis and design of stepped cantilever retaining wall citeseerx. Structural software cantilever and restrained retaining. Sand, friction angle 30 degrees, total unit weight 120 pcf, loading modulus of elasticity eload 300 ksf, reloading modulus of elasticity eur 900 ksf. Eurocode 7 workshop retaining wall examples 57 mafiadoc. Redirock wall freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of redirock gravity walls. Design tables appendix b design example appendix c analysis of cohesive soils appendix d site investigation. Suggest suitable dimensions for the rc retaining wall example 1. Worked example 2 design of concrete cantilever retaining. Counterfort retaining wall analysis, design, drawing and quantity software. Pdf advanced measurements on cantilever retaining wall models. You are invited to download the free 15day software.
Structural design of cantilever retaining wall is depend on separating each part of wall and design it as a cantilever, so its called cantilever r. Geotechnical design of cantilever retaining walls to. In this video lecture you are able to learn about retaining wall design by staad pro software. Q1b calculate the soil pressure under the footing of the retaining wall of q1a.
Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. We require this information in order to email you a working demo. Ce 437537, spring 2011 retaining wall design example 3 8 3. The following worked example is for a freestanding cantilever wall that is considered sufficiently flexible for active soil pressures to be used for design. For this height of sand, determine the maximum bending moment in the sheet pile wall. Cantilever retaining wall sheet excel web share 20161018t23. Worked example 1 design of cantilever pol retaining walls. Many engineers use the cantilever wall term to actually describe gravity walls. Optimal design of cantilever reinforced concrete retaining wall can lead considerable cost. Main features calculate earth pressure coefficients based on rankines theory and coulombs theory. Reinforced concrete cantilever retaining wall analysis and design aci 31814 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. It offers a number of wall shapes and checks reinforced concrete crosssections. A wall number is assigned as per criteria discussed in. Assume level backfill, no surcharge or seismic loading, active earth pressure and masonry laid in running bond.
Concrete masonry reinforced cantilever retaining walls edition e3, may 20. Dr andrew bond director, geocentrix ltd chairman tc250sc7. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force. This objective has been accomplished and the proposed. Analysis and design of cantilever retaining walls on staad.
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