The reliability of a design is assured by satisfying the requirements. The cantilever retaining wall shown below is backfilled with granular material having a unit weight. Gravity walls are the earliest known retaining structures. Deflection generally governs design for cantilever walls more than 18 feet high. Some of the many types of gravity retaining walls were described in chapter 1. Design of retaining wall design as per indian standards civil engineering duration. The load that presents the greatest problem and its primary concern is the lateral earth pressure induced by the retained soil. There various parts of a retaining wall and design principles of these retaining wall components based on different factors and material and methods of construction are discussed.
Asdip retain is based upon the latest ibc aci 318 specifications asdip retain software is also able to design block retaining wall per the latest msjc provisions. Reinforced cement concrete retaining wall cantilever type maximum 6. The behavior of soil was considered to be elastoplastic with mohrcoulomb failure design of retaining wall based on the criterion whereas that of the concrete. Mcgrawhill international edition, 1997 may be referred.
Abarac 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. Possible modes of failure for freestanding concrete cantilever retaining walls are illustrated in cartoon fashion in figure x. Design of industrial steel building by limit state method. Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads. Reinforced soil retaining walls design examples nptel. Nptel advanced foundation engineering1 the design of this type of retaining wall is similar to that presented in section 11. Now, for this section, now this pore water hydrodynamic effect of the pore waters, as i have discussed in the last class that if this is the retaining wall and these. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Design of retaining wall building civil engineering.
The load that presents the greatest problem and its primary concern is the lateral earth pressure. A complete design should address each of these modes of failure where appropriate. May 04, 2017 basic rule of retaining wall wall design dimension of rcc retaining wall design duration. The other two forms of construction are covered in separate guides. In the previous class, we have been discussing about the design of reinforced soil retaining walls, and let us continue the discussion in this class.
Retaining walls are structures used to retain earth or water or other materials such as coal, ore, etc. Pdf behavior of cantilever and counterfort retaining walls. 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. 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. External stability analysis of reinforced soil retaining walls nptel. Schematic of a retaining wall and common terminology. 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. Soil loadings considered in this design and calculations are based on the following parameters. Active earth pressure or earth pressure pa and passive earth pressure pp.
Apart from soil, the lateral pressure is caused by the pressure of liquid, earth filling, sand, or other granular material filled behind the wall after its constructed. Lateral forces on retaining wallsence 454 assakkaf design of retaining walls the design of retaining wall must account for all applied loads. They are built from solid concrete or rock rubble mortared together. 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. Design of cantilever and counterfort retaining walls pdf. In 1990 the concrete masonry association of australia cmaa published masonry walling guide no 4 design for earth loads retaining walls, which set out a design methodology for earth retaining structures. Design codes for reinforced soil retaining walls nptel. The design was analyzed with various software packages such as. Reinforced soil retaining wallsdesign and construction nptel.
The design process for a segmental retaining wall typically has a wall design engineer or site civil engineer responsible for the wall design envelope. Wisdot bridge manual chapter 14 retaining walls january 2019 147 14. Therefore, they are usually not reinforced with steel. Earthquake load the force exerted on the structure by earthquake action, acting on either or both the face of the retaining wall and any other structure supported by the retaining wall. 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.
Enchanting retaining wall design example with water tiered garden within size 2048 x 1536 retaining walls design nptel if you previously have highlightin design of retaining wall nptel whether you making a new one for your new home or are remodeling your existing bathroom, the. Asdip retain is a structural engineering software utilized by engineers for retaining wall design. Cdotdtdr200105 prepared by colorado department of transportation research branch sponsored by the colorado department of transportation in cooperation with the. Reinforced concrete shear wall analysis and design a structural reinforced concrete shear wall in a 5story building provides lateral and gravity load resistance for the applied load as shown in the figure below. Earth pressure and retaining wall basics for nongeotechnical engineers richard p.
First, with the lateral earth pressure known, the structure as a whole. Whereas, if bracing is in front of the wall and is in compression instead of tension, the wall is called buttress retaining wall. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Often the backfill slopes upward from the back face of the wall. It is for both the practicing engineer who has become a bit rusty on this. The designed reinforced soil retaining wall was built using local materials sand. Design and analysis of retaining walls 2 economical when the wall height exceeds 8m. Retaining wall general notes allan block wall systems. Assuming that the allowable bearing pressure of the soil is 120 knm. And then the more recent update, the federal highway administration is the nchrp report and the seismic analysis and design of retaining walls buried. Basics of retaining wall design page viii why this book. Jan 30, 2018 retaining walls are structures that are constructed and designed to resist the lateral pressure of the soil.
We collected most searched pages list related with nptel. Weber course content content section 1 retaining walls are structures that support backfill and allow for a change of grade. D ata sheet concrete retaining walls concrete retaining walls provide a durable solution that is required of a structure in contact. In particular, it was predicted that, by lowering the ground water level, the water pressure acting on the wall could be reduced by at least 30%. Calculate lateral earth pressure forces acting on the wall. It is a power point presentation on counterfort retaining wall. Principles of retaining wall design the constructor.
The following parameters influence the design of the retaining wall. To design retaining walls properly, an engineer must know the basic soil parametersthat is, the unit weight, angle of friction, and cohesionfor the soil retained behind the wall and the soil below the base slab. Earth pressure and retaining wall basics for nongeotechnical. Reliability analysis of counterfort retaining walls. Retaining walls are structures used to provide stability for earth or other materials at their natural slopes. Lec 4 problem on design of rcc cantilever retaining wall. Design of semi gravity retaining walls 1 a semi gravity retaining wall consisting of plain concrete weight 145 lbft. For instance a retaining wall can be used to retain fill along a slope or it can be used to.
Knowing the properties of the soil behind the wall enables the engineer to determine the lateral pressure distribution that has to be designed for. The wall friction has been neglected in the analysis, but it is required for calculation of sliding factor of safety for the wall. Retaining walls in theory and practice, a textbook for students. Retaining walls are structures that are constructed and designed to resist the lateral pressure of the soil. Get details of nptel lectures on shear wall design. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. Design and detailing of retaining walls learning outcomes. Basic rule of retaining wall wall design dimension of rcc retaining wall design duration. This is a simple web app that is able provide a basic design of a cantilever retaining wall based on user inputs.
Gabion retaining wall design calculations concrete. Now, in this class, i will basically solve one example of cantilever retaining wall, to show that how this the dimension of this retaining wall, is decided. Earth pressure is the pressure exerted by the retaining material on the retaining wall this on the retaining wall. Kousik deb,department of civil engineering,iit kharagpur. The bank of supported earth is assumed to weigh 110 lbft. What is the design procedure for gravity retaining wall. In general, the cost of constructing a retaining wall is usually high compared with the cost of forming a new slope. For this type of retaining wall, which is made up of pcc. Retaining walls types of retaining wallsstability of. Now depending upon it is weight, we will get the stability for this type of gravity retaining wall. The design of retaining wall must account for all applied loads. Any wall that sustains significant lateral soil pressure is a retaining wall. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. This guide covers the design of segmental concrete gravity retaining walls.
Design of retaining wall free download as powerpoint presentation. Retaining walls are utilized in the formation of basement under ground level, wing walls of bridge and to preserve slopes in hilly terrain roads. For details of other type the book foundation analysis and design by j. Ce 537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. There are two phases in the design of a conventional retaining wall. In this example, the structural design of the three retaining wall components is performed by hand. Results from pre vious large scale retaining wall tests and field studies are presented. The horizontal load acting on the wall were, during design, predicted to be high and measures for reducing it are taken. And this is constructed for pcc, plain cement concrete. Retaining wall design structural engineering software. Type of retaining wall failure to design retaining walls, it is necessary to know how wall can fail.
Gravity walls depend upon bulk weight for stability, as opposed to a cantilevered retaining wall fixed to a foundation. Worked example 2 design of concrete cantilever retaining walls to. Aug, 2014 mod01 lec24 design of retaining wall contd. The slope is usually expressed as a ratio of horizontal to vertical e. Are you looking for nptel lectures on shear wall design. Design of cantilever retaining wall, design of cantilever steel beam, design of cantilever steel plate, design of cantilevered retaining walls, design of cantilevered metal stud wall, design of cantilever sign base, design of cantilevered stair vibration, design of cantilever decking, design of cantilever, design of cantilever retaining wall, design of cantilevered retaining walls, design of. Design and construction guidelines for mse walls with independent full height facing panels by naser abuhejleh michael mcmullen george hearn jorge zornberg report no. For the user this book is intended to cover and explain design practices and building code requirements for the design of earth retaining structures. Design of semi gravity retaining walls wec civilians. Geotechnical engineers should be hired to evaluate the overall stability of the site. However, the term is usually used with reference to a cantilever retaining wall, which. Following is a stepbystep procedure for design based on the recommendations of bell et al. In particular, it was predicted that, by lowering the ground water level, the water pressure acting on. We collected most searched pages list related with nptel lectures on shear wall design and more about it.