Worked example 2 design of concrete cantilever retaining. As a wall designer, this document should be used to determine required. Final duevel arema retaining wall design for the railroad. Retaining walls are defined as a class 10b structure under the building code of australia. As an example, consider the retaining wall shown below, which supports a flat backfill load. Can i get a retaining wall design example based on euro codes. For economical design, soil pressure resultantr must be in line with front face of wall. Department of civil engineering 6 in the counterfort retaining wall, the stem and the base and the base slab are tied together by counterforts, at suitable intervals. Section showing counterfort retaining wall for bus parking area at 4.
Designer must provide complete design and plan details 1. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Development of secant pile retaining wall construction. Lateral forces on retaining wallsence 454 assakkaf design of retaining walls the design of retaining wall must account for all applied loads. Geotechnical design dublin, 14 june, 20 support to the implementation, harmonization and further development of the eurocodes eurocode 7. Counterfort retaining wall architecture britannica. Design of retaining walls on boundary for surcharge load. Hence they provide a lateral support to vertical slopes of soil that would otherwise collapse into a more natural shape. Retaining walls in theory and practice, a textbook for students. 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. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. Analysis of embedded retaining wall using the subgrade reaction method 65 line, the second readings from geo5 sheeting check program dots point data. Table 1 provides the order of precedence for reference documents and engineering design standards, applicable to the detail design of the retaining walls on. As for this height, cantilever retaining wall is not recommended and counter fort retaining wall is not economical.
Counterfort wall concrete design eurocode standards. Worked example 2 design of concrete cantilever retaining walls to. We stand for making engineering education a practical approach. Design and detailing of retaining walls learning outcomes. Basic steps to follow while designing the counterfort retaining wall are. This document is a stepbystep design example of a typical counterfort retaining wall using asdip retain.
Analysis and design of a retaining wall chapter one introduction retaining walls cantilever rw rankin theory forces on cantilever rw counterfort rw forces on counterfort rw the gravity rw forces on gravity rw chapter two stability of retaining wall soil properties of rws drainage in rw allowable bearing capacity chapter three procedure for the. They consist of a relatively thin stem and a base slab. Cantilever retaining walls are constructed of reinforced concrete. This pressure tends to cause sliding and or rotation of the wall which must therefore be designed to resist these forces over the intended design life. I have to design a stepped retaining wall for 22m height. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. The walls must resist the lateral pressures generated by loose soils or, in some cases, water pressures. 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. Worked example 4 version 1 design of a tiedback retaining wall to resist earthquake loading. Design considerations and alternatives for retaining walls. Retaining wall shown without dead men sleeper retaining wall on slope most current free of charge retaining walls garden style should you have your backyard while in the nashville spot, the chances are you may have thought it was a chall. The safety factor against sliding minimum required f. These make the selection of appropriate retaining wall systems and their design more complex. To navigate through the ribbon, use standard browser navigation keys.
The building act 2004 schedule 1, exempts some retaining walls including. Reliability analysis of counterfort retaining walls. However, retaining walls can also be constructed for aesthetic landscaping purposes. Calculations were made for two types of earth pressure behind the wall, namely.
Definition and purpose retaining walls are structures that are constructed to support almost vertical steeper than 70 degrees or. Due to the wall height of 25 feet, the use of counterforts has proven itself to be a more economical solution. Concrete retaining walls building inspections brisbane qbis. The following worked example is for a freestanding. Design of retaining walls as presented in this bulletin are in accordance with sections 1610. The following figure shows theses different types of retaining walls.
Retaining counterfort wall design free download as pdf file. Retaining walls are usually built to hold back soil mass. Active earth pressure tends to deflect the wall away from the backfill. Development of secant pile retaining wall construction in urban new zealand nick wharmby brian perry civil, hamilton, wa. Alternative design procedures justified in a geotechnical report may also be approved. Design and detailing of retaining walls for class held from 2 nd april 07. Pdf design and detailing of retaining walls for class. Counterfort retaining wall design example using asdip retain. Pc17 retaining walls idaho transportation department. Pdf analysis of counterfort retaining wall with and.
The design examples provided in the manual are prepared in. Milberger this investigation was conducted under research study 2571169 entitled determination of lateral earth pressure for. This document is disseminated in the interest of information exchange. Sketches of the retaining wall forces should be considered to properly distinguish the different forces acting on our retaining wall as tackled in the previous article, retaining wall. Name 120106039 kaizer dave 120106045 kishan vyas 120106061 binoy patel internal guide. Counterfort retaining wall gandhinagar institute of technology. Within these groups many common variations exist, for example cantilever walls may have additional supporting ties into. Tiedback retaining walls were used originally as a substitute for braced retaining. In retaining wall a counterfort retaining wall is a cantilever wall with counterforts, or buttresses, attached to the inside face of the wall to further resist lateral thrust. Department of civil engineering design of reinforced concrete structure 2170607 counterfort retaining wall gandhinagar institute of technology. For assistance, contact the geotechnical engineer at itd headquarters. Mechanically stabilized earth mse retaining walls are growing in popularity. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. The backfill density is 115 pcf and the friction angle is 30 degrees.
Therefore, they are usually not reinforced with steel. The wall will be built adjacent to the roadway shoulder where traffic is 2 ft. When the height of the retaining wall exceeds about 6 m, the thickness of the stem and heel slab works out to be sufficiently large and the design becomes uneconomical. Current retaining wall design procedures are summarized with emphasis on the prediction of lateral earth pressures using the coulomb and rankine earth pressure theories, and the equivalent fluid pressure method. This information pack is to provide guidance to ipswich residents in relation to the construction of a retaining wall on their property. The geotechnical failure modes, which need to be considered in the design of a counterfort retaining wall are i horizontal sliding along the base of the wall, ii the rotation about the toe of the wall overturning, and iii bearing capac. Height of retaining wall for saturated soil pressure, h1height of retaining wall for submerged soil pressure, h2. In such a case counterforts having trapezoidal section fixed at the base slab are provided at intervals of 1. The guide is an updated version of the original produced by mr. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation. Retaining walls are structures used to provide stability for earth or other materials at their natural slopes. In addition to this module, the documents that guide or govern the investigation, design. The design of a counterfort retaining wall is similar in many respects to that of a cantilever retaining wall as far as computing overturning and sliding stability, bearing capacity, and soil.
Retaining walls are structure used to retain soil, rock or other materials in a vertical condition. Thickness of heel slab and stem 5% of height of wall. Design of retaining wall with counterfort according to aci 318 08 retaining structures hold back soil or other loose material where an abrupt change in ground elevation occurs. Acceptable engineering criteria for retaining wall design.
There are another type of retaining wall called counterfort rw and is a. Gravity walls are the earliest known retaining structures. The substructure design of pilefounded walls is not included, but is covered in em 111022906. Aci 318 08 design of retaining wall with counterfort rev1. Design of retaining wall with counterfort according to aci 318 08 7. We are proud to offer an engineered wall system that is easy to. Retaining wall design engineers and geoscientists bc. Other documents may provide more specific guidelines or rules for specialist structures and these may take precedence over this document. Retainpro is an established engineering design software specifically for retaining walls. New retaining wall design criteria based on lateral earth pressure measurements by william v.
Can i get a retaining wall design example based on euro codes design should be based on. 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. Counterfort retaining wall spreadsheet concrete design. Oct 23, 2012 ce 437537, spring 2011 retaining wall design example 18design a reinforced concrete retaining wall for slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Worked examples presented at the workshop eurocode 7. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Concrete retaining walls may be considered in terms of three basic categories. The retained material or backfill exerts a push on the structure and thus tends to overturn or slide it, or both. The uwall retaining wall system was jointly developed by csi, cleco manufacturing a csi subsidiary, and the late ray oneill designer of the stawal and twall retaining wall systems. Design of retaining wall with counterfort engineering. Design principles of totally prefabricated counterfort. Some important concepts substantial to the structural design of rc retaining walls. Retaining wall materials science continuum mechanics. The load that presents the greatest problem and its primary concern is the lateral earth pressure induced by the retained soil.
Variations on the basic design, including curves, tiers, railings, stairs, walkways and the like are making them more and more attractive to designers and architects. The wall stem is 16 wide to accommodate mounting a type 7 bridge rail to the top of wall. As you know, the proper design and construcfion of a retaining wall is essenfial. Course objectives they seem to crop up everywhere, like cell phone towers. 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. Retaining wall design for the railroad infrastructure. Design and detailing of counterfort retaining wall when the height of the retaining wall exceeds about 6 m, the thickness of the stem and heel slab works out to be sufficiently large and the design becomes uneconomical. Design of peripheral retaining wall at basement level for bus parking area at 4. The second edition of the retaining wall design guide has been produced by the usda forest service. They are not full detailed calculations such as might be prepared for a real wall design but are limited to the calculation of earth pressure and bearing capacity, showing how the recommendations of bs8002 are applied in practice. This manual describes procedures for the design of retaining and flood walls on shallow foundations, i. Ce 437537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. In order to avoid adversely affecting the structural integrity of the retaining wall each land owner has a responsibility to ensure the following including making builders or tenants aware.
Design principles of totally prefabricated counterfort retaining wall system compared with existing castin. Design of a counterfort retaining wall researchgate. Current retaining wall design procedures are summarized with emphasis on the prediction of lateral. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof. That works adjacent to the retaining wall structure complies with the design parameters noted above. Deflection generally governs design for cantilever walls more than 18 feet high. Design of retaining wall with counterfort according to aci. In this example, the structural design of the three retaining wall components is performed by hand.
They are built from solid concrete or rock rubble mortared together. The prefabricated concrete counterfort retaining wall s design strength moment and shear surpassed that of the existing system with an overall reduction in concrete volume of 57%. Design of the retaining wall structures on the m4 smart motorway. Because of provision of counterforts, the vertical stem as well as the heel slab acts as a continuous slab, in. The base thickness of stem should be greater than the thickness of base slab. Retaining walls in theory and practice, a textbook for.
Retaining wall design example revised jim richardson. Active earth pressure or earth pressure pa and passive earth pressure p p. Most common materials used for retaining walls are. The retaining wall supports 150 of level roadway embankment measured from top of wall to top of footing. Review current design procedures to use as a format for the. Rubble retaining wall design pdf retaining wall design 10 edition th. Preliminary proportioning of cantilever retaining wall. The focus of the guideline is the geotechnical aspects of retaining wall design. The contract documents and contract requirements are discussed in. A basement wall counterfort retaining wall design example thus one kind of counterfort retaining wall design example wall. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof differentdifferent typestypes ofof.
In no case thickness of any component be less than 300mm. Take the coefficient of friction between concrete and soil as 0. Design and analysis of configurations and loading conditions make it easy and increase productivity. Worked example 4 design of a tiedback retaining wall to. The lateral forces from backfill is resisted by the weight of wall itself, and due to their massive nature, they develop little or no tension. Analysis of counterfort retaining wall with and without pressure relief shelf using soft computing technique article pdf available december 2016 with 2,622 reads how we measure reads. A counterfort retaining wall is a cantilever wall with counterforts, or buttresses, attached to the inside face of the wall to further resist lateral thrust. Preliminary proportioning of counterfort retaining wall. The following worked examples have been prepared to illustrate the application of bs8002 to retaining wall design. Thickness of toe slab buttress not provided 8% of height of wall. Design considerations and alternatives for earth retaining structures earth retaining structures are classsified into two groups where to consider an earth retaining structure limited rightofway group 1. Ce 433, fall 2006 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. Some common materials used for retaining walls are treated lumber, concrete block systems, poured concrete, stone, and brick.
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