The load calculation forms the base for entire design of the retaining wall. Design steps and procedure of counterfort retaining wall is explained in this video. Cantilever retaining wall design example linkedin slideshare. The example calculations are made here using mathcad. The coefficient of friction between the footing and foundation soil, k 1, is 0. Norfolk and tasman retaining walls au keystone retaining wall systems.
P a active earth pressure or earth pressure pa and passive earth pressure pp. Ground water behind a retaining wall, whether static or percolating through a subsoil, can have adverse effects upon the design and stability. An analysis of the designs submitted is presented here. Cantilever retaining wall sheet excel web share 20161018t23. 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. Cantilever retaining wall analysis, design, drawing and quantity software. Geotechnical design of cantilever retaining walls to. 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.
Bartoskewitz engineering research associate research report no. Design tables appendix b design example appendix c analysis of cohesive soils appendix d site investigation. National choice of design approach for retaining walls 17. This publication presents an example on the design of retaining structures. A summary of the design calculations is presented in. Cantilever rc retaining wall 10 knm2 m 500 mm h 400 0. Abstract three examples of retaining walls were prepared for comparison of designs.
Design of slopped gravity retaining wall in excel design of vertical gravity retaining wall sloped type. Many engineers use the cantilever wall term to actually describe gravity walls. Design of concrete cantilever retaining wall civil. 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. This is a simple web app that is able provide a basic design of a cantilever retaining wall based on user inputs. Wsdot standard plan reinforced concrete retaining wall. Concrete masonry reinforced cantilever retaining walls. Design and detailing of retaining walls learning outcomes. 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. Appendix a examples colorado department of transportation. The purpose of this article is for the reader to fully understand the principle behind it. Deepex can design retaining walls with many different wall and support types. 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.
Foundation design 18 example 1 design the cantilever sheet pile wall that satisfy the requirements for stability of the wall. This objective has been accomplished and the proposed. Eurocode 7 workshop retaining wall examples 57 mafiadoc. The stem is a vertical cantilever beam, acted on by the horizontal earth pressure. To further understand the designed approach, here is a worked example of the design of the retaining wall. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a range of possible finishes. Check against a worked example in the reference above. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. The cantilever retaining wall shown below is backfilled with granular material having a unit weight. Structural software cantilever and restrained retaining. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance.
The following worked example uses a simplified lrfd design procedure with load and resistance factors taken from b1vm4. A wall number is assigned as per criteria discussed in. A secant pile wall example will be analyzed with deepex. Q1b calculate the soil pressure under the footing of the retaining wall of q1a. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation. Stepbystep design of a cantilevered retaining wall. It is time consuming to do all the stability and reinforcement design. Final duevel arema retaining wall design for the railroad. It is time consuming to do all the stability and reinforcement design using in house tools. Design of retaining wall with counterfort engineering. Cantilever timber pole walls are probably the most commonly used form of. The safety factor against sliding minimum required f.
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. Optimal design of cantilever reinforced concrete retaining wall can lead considerable cost. Cantilever or restrained retaining wall design calculations o r g a n iz a io n f. It offers a number of wall shapes and checks reinforced concrete crosssections. Calculations had been submitted in advance for these designs by 15 contributors and an initial comparison was presented at the workshop. The paper covers a theoretical approach in data acquisition needed for design of a retaining wall.
Section 9 of en 19971 applies to retaining structures supporting ground i. The cantilever retaining wall design involves two major steps. 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. You are invited to download the free 15day software.
The wall is assumed to be located in the christchurch port hills. This type of wall uses much less material than a traditional gravity wall. The following worked example is for a freestanding cantilever wall that is considered sufficiently flexible for active soil pressures to be used for design. The stability is maintained by the weight of the retaining wall and the earth on the heel slab of the retaining wall. 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.
A total of ten designs were considered, of which three were retaining walls. Common design issues are described in the following sections. Counterfort retaining wall analysis, design, drawing and quantity software. Soilstructure software increases the engineers bottom line by eliminating hours of tedious calculations. Retaining wall design in staad pro software youtube. This example is intended to be readily calculated by hand although a lot of structural spreadsheets and software such as prokon are available. To design retaining walls, it is necessary to define failure and to know how walls can fail. It is considered suitable for common residential situations with competent soils. Design of cantilever pole retaining walls to resist earthquake loading for residential sites. 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. Suggest suitable dimensions for the rc retaining wall example 1.
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. We require this information in order to email you a working demo. 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. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note.
Downloads retaining wall design software cti software. Geotechnical design dublin, 14 june, 20 support to the implementation, harmonization and. Supports and external loads can be added on the model graphically or using the userfriendly model wizard. Wisdot regional staff determines the need for permanent retaining walls on highway projects. As a result, the designer must ensure that by appropriate. The procedure is more of a general summary and an appreciation of the role of subsurface exploration in geotechnical design. Assuming that the allowable bearing pressure of the soil is 120 knm. It is so named because its individual parts toe, heel, and stem behave as, and design as, cantilever beams. The details of a cantilever retaining wall are shown below, is the design of the wall satisfactory. Cantilever retaining wall sheet excel civil engineering. Worked example 1 design of cantilever pol retaining walls. If you continue browsing the site, you agree to the use of cookies on this website. In this video lecture you are able to learn about retaining wall design by staad pro software.
Surcharge large surcharge loads are induced on retaining walls in close proximity to track. Counterfort retaining wall design example using asdip retain. Cantilever retaining wall sheet excel civil engineering program. Redirock wall freeware is a robust software tool for geotechnical engineers to design and analyze cross sections of redirock gravity walls. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. Worked example 2 design of concrete cantilever retaining walls to. Worked examples presented at the workshop eurocode 7. Pdf advanced measurements on cantilever retaining wall models.
Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. 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. Design of cantilever sheet pile walls january 2015. Retaining wall development is described in section 11555 of the.
Ab engineering manual retaining walls allan block wall. Cantilever retaining wall functions and design considerations. Design the reinforced concrete masonry cantilever retaining wall shown in figure 2. 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. Sand, friction angle 30 degrees, total unit weight 120 pcf, loading modulus of elasticity eload 300 ksf, reloading modulus of elasticity eur 900 ksf. The details of calculations mr are tabulated below. Possible modes of failure for freestanding concrete cantilever retaining walls. The ab stones provide a nominal setback of twelve degrees from vertical. Cantilever walls cantilever wall design deep excavation. Concrete masonry reinforced cantilever retaining walls edition e3, may 20. 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. This procedure is intended to be readily calculated by hand, although use of calculation software. Dr andrew bond director, geocentrix ltd chairman tc250sc7. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the.
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. Design of gravity retaining walls in excel sloped and stepped. The program is used to verify the cantilever wall design. We should know that retaining walls must satisfy geotechnical, equilibrium, structural, upheaval, seismic considerations, etc. For this height of sand, determine the maximum bending moment in the sheet pile wall. The following figure shows theses different types of. Ce 437537, spring 2011 retaining wall design example 3 8 3.
Retaining wall design of reinforced concrete structure. Cantilever and restrained retaining wall design software. For engineering background, see the blog post cantilever retaining walls. The base is divided into two parts, the heel and toe. Assume level backfill, no surcharge or seismic loading, active earth pressure and masonry laid in running bond. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force.
Preface standards australia has published as 46782002 for the design of earth retaining structures, which include segmental concrete gravity retaining walls. Oct 16, 2017 all elements of behave like cantilever beam of slab. Determine the resultant vertical force, w total intersects the bottom of the footing. Full details of masonry wall construction are provided in reinforced concrete masonry cantilever retaining walls design and. Retaining walls slope stability slope stabilization slope stability analysis. Main features calculate earth pressure coefficients based on rankines theory and coulombs theory. Analysis and design of cantilever retaining walls on staad. How to choose the right retaining wall for your project. Active earth pressure tends to variation of earth pressure deflect the wall away from the 5. 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. 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 concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Calculate the factors of sa fety with respect to overturning, sliding, and bearing capacity.
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