Gravity wallmasonry or plain concrete cantilever retaining wallrcc inverted t and l. The base is also divided into two parts, theheel and toe. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. However, retaining wallscanalsobeconstructed for aesthetic landscaping purposes. The following text provides a general discussion and design guidelines for these flexible wall. The ssr is sent to the wall designer structures design section or wisdots. Of these walls, only the cantilever retaining walls and the bridge abutments are mostly used at present due to their great economics. The following figure and design data section will serve as input for detailed analysis and design. The cantilever retaining wall shown below is backfilled with granular material having a unit weight.
Reinforced concrete cantilever retaining wall analysis and. Basics of retaining wall design page viii why this book. Main features calculate earth pressure coefficients based on. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. Pdf design and detailing of retaining walls for class. Determine the factors of safety against sliding and overturning. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Concrete masonry reinforced cantilever retaining walls edition e3, may 20.
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. Some other basic concepts are also explained like, curtailment of bars development length distribution. This design example focuses on the analysis and design of a tapered cantilever retaining wall including a comparison with model results from the engineering software programs spwall and spmats. Jun 10, 2018 numerical of cantilever retainig wall is discussed in this video in a simple manner. Worked example 2 design of concrete cantilever retaining walls to. The safety factor against sliding minimum required f. The size of the section of a gravity retaining wall may be redud if a small amount of reinforcement is provided near the back face fig. Retaining wall designrev bogor agricultural university. Cantilever retaining wall are usually of reinforced concrete and work on the principles of leverage. Cantilever retaining wall is the most common type of earth retaining structure. Cross section of cantilever retaining wall a and the finished retaining wall b figure. This is a simple web app that is able provide a basic design of a cantilever retaining wall based on user inputs.
Embedded cantilever retaining walls are currently designed using the limit equilibrium method in which the wall is assumed to rotate rigidly around a pivot point located at a short distance from. Cantilever retaining wall sheet excel web share 20161018t23. Retaining wall design example structural engineering software. Cantilever retaining walls are constructed of reinforced concrete. 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. Mar 04, 2019 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. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. This loading situation can be found when retaining wall is used to support embankment carrying traffic road way. However, retaining walls can also be constructed for aesthetic landscaping purposes. These forces on retaining wall depends on various factors which are discussed. Magnumstones concrete cantilever retaining wall design is the perfect solution for many applications. Types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. Cantilever retaining wall analysis excel sheet purpose of calculation.
Nongravity cantilever walls rely strictly on the structural resistance of the wall in which vertical elements of the wall are partially embedded in the soil or rock. After examining the wall stability, it was concluded that. Cantilever retaining walls if unrestrained, a soil embankment will. Retaining counterfort wall design free download as pdf file. For the user this book is intended to cover and explain design practices and building code requirements for the design of earth retaining structures. The design of a retaining wall must account for all applied loads. The retaining wall is fixed to the reinforced concrete slab foundation and have a uniform cross section. In the past, structville has published a 17 page document on geotechnical design of cantilever retaining walls subjected to earth load, pavement surcharge load, traffic load, etc. Conventional retaining walls gravity retaining structures stability depends on the self weight of the wall not economical for design semigravity retaining structures minimum amount of reinforcement may be used in the wall to reduce the size of wall cantilever retaining walls reinforced concrete is used in wall design with thin stem and slab base.
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. These design methods are discussed in detail in allowable stress design of concrete masonry, tek 147a, and strength design of concrete masonry, tek 144a refs. The focus of the guideline is the geotechnical aspects of retaining wall design. Retaining walls are used to provide lateral resistance for a mass of earth or other. 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. Design of cantilever retaining wall type of retaining wall and applied forces would be like below.
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. Figure 1reinforced cantilever retaining wall detailing mortar cap or other, as desired bond beam. Design and detailing of retaining walls engineering books. This design example focuses on the analysis and design of a tapered cantilever retaining wall including a comparison with model results. Numerical of cantilever retainig wall is discussed in this video in a simple manner. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof differentdifferent typestypes ofof. Cantilever retaining walls can be precast in a factory or formed on site and considered economical up to about 25 ft in height. This objective has been accomplished and the proposed. Types of retaining walls tieback wall tieback is a horizontal wire or rod, or a helical anchor use to reinforce retaining wall for stability one end of the tieback is secured to the wall, while the other end is anchored to a stable structure i. Preliminary proportioning of cantilever retaining wall.
They consist of a relatively thin stem and a base slab. The following worked example is for a freestanding cantilever wall that is considered. Retaining walls and chapter 730 steep reinforced slopes. Classification of retaining walls cantilever retaining wallrcc inverted t and l. The heel is the part of the base under the backfill. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. Reinforced concrete wall design basics mike oshea, p.
Full details of masonry wall construction are provided in reinforced concrete masonry cantilever retaining walls design and. Masonry cantilever retaining walls design and construction guide. Analysis and design of cantilever retaining walls on staad. Worked example 2 design of concrete cantilever retaining. Example 8 cantilever wingwall design loads 6 21 design section b summary the abutment width along the skew, a 3. Wisdot regional staff determines the need for permanent retaining walls on highway. Loads and forces acting on retaining wall and their. 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. Retaining walls are usually built to hold back soil mass. Figure 1 illustrates typical cantilever retaining wall detailing requirements. Retaining walls and chapter 730 steep reinforced slopes 730. Wisdot bridge manual chapter 14 retaining walls january 2019 141. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation. Design a suitable counterfort retaining wall to support a leveled backfill of height 7.
It derives its name from the fact that its individual parts behave. The loads that are of primary concern are the lateral earth pressures induced by the retained soil. Assuming that the allowable bearing pressure of the soil is 120 knm. 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. The design of a retaining wall or reinforced slope consists of the following.
Cantilever retaining wall with shear keywith shear key batter drainage hole toe 2. Assume good soil for the foundation at a depth of 1. Cantilever retaining wall functions and design considerations. Reinforced concrete cantilever retaining wall analysis and design. Jul 01, 2019 cantilever retaining wall analysis excel sheet purpose of calculation. It has much thinner stem and utilize the weight of the backfill soil to provide most of the resistance to sliding and overturning. Cantilever retaining wall is the most common type of earthretaining structure. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a range of possible finishes.
Calculate the factors of sa fety with respect to overturning, sliding, and bearing capacity. The details of a cantilever retaining wall are shown below, is the design of. It is so named because its individual parts toe, heel, and stem behave as, and design as, cantilever beams. Design and construction of a precast ultrahigh performance. 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.
Deflection generally governs design for cantilever walls more than 18 feet high. In this type of retaining wall, counterforts cantilevers are provided on the earth side between wall and footing to support the wall, which essentially spans as a. Cantilever retaining wall sheet excel civil engineering. Cantilever and restrained retaining wall design software. Design and detailing of retaining walls learning outcomes. Design of cantilever sheet pile walls january 2015. Wisdot bridge manual chapter 14 retaining walls january 2019 147 14. Various types of loads and forces acts on a retaining wall and their calculation is important for its design. The environmental performance of the precast uhpc cantilever retaining wall is compared against the conventional precast rc cantilever retaining wall. Retaining wall development is described in section 11555 of the.
Ce 437537, spring 2011 retaining wall design example 3 8 3. The stem is a vertical cantilever beam, acted on by the horizontal earth pressure. Current retaining wall design procedures are summarized with emphasis on the prediction of lateral earth pressures using the coulomb and rankine earth. It is for both the practicing engineer who has become a bit rusty on this.
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